Gotowe bibliografie tematyczne / Nanocomposites for thermoelectric applications

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Gotowa bibliografia na temat „Nanocomposites for thermoelectric applications”

Autor: Grafiati
Data publikacji: 6 września 2023

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Artykuły w czasopismach na temat "Nanocomposites for thermoelectric applications"

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Vignesh, C., K. Vinoth, L. Chinnappa i Jeronsia J. Emima. "Controlled Synthesis of Polyaniline/Iron Oxide Nanocomposites for Thermoelectric Applications". Research Journal of Chemistry and Environment 27, nr 7 (15.06.2023): 23–33. http://dx.doi.org/10.25303/2707rjce023033.

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Polyaniline (PANI) / iron oxide (Fe3O4) nanocomposites were synthesized via the sol-gel method by tuning the weight ratios of Fe3O4 (2wt %, 4wt % and 6wt %). The functional groups, crystal structure and surface morphologies of the PANI/Fe3O4 nanocomposites were analyzed using Fourier transform infrared spectroscopy (FTIR), X–ray powder diffraction and Scanning electron microscopy (SEM) respectively. The thermoelectrical properties were also analyzed. Based on the FTIR studies, the presence of functional groups of PANI/Fe3O4 nanocomposites was revealed. From SEM observations, spherical nanoparticles were found. As the temperature increases from 30°C to 90°C, the electrical conductivity of the nanocomposites increases from 34.01 to 39.54 mS/cm and the thermal conductivity decreases from 1.401 to 0.765 Wm-1K-1. Among the three different PANI/Fe3O4 nanocomposites characterized, the PANI/Fe3O4 nanocomposite with 6wt % gives better results by showing an excess figure of merit of 0.016. Henceforth, as the weight percentage of iron oxide with polyaniline increases, the thermoelectric properties of the nanocomposites drastically improve.
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Tanusilp, Sora-at, i Ken Kurosaki. "Si-Based Materials for Thermoelectric Applications". Materials 12, nr 12 (17.06.2019): 1943. http://dx.doi.org/10.3390/ma12121943.

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Si-based thermoelectric materials have attracted attention in recent decades with their advantages of low toxicity, low production costs, and high stability. Here, we report recent achievements on the synthesis and characterization of Si-based thermoelectric materials. In the first part, we show that bulk Si synthesized through a natural nanostructuring method exhibits an exceptionally high thermoelectric figure of merit zT value of 0.6 at 1050 K. In the second part, we show the synthesis and characterization of nanocomposites of Si and metal silicides including CrSi2, CoSi2, TiSi2, and VSi2. These are synthesized by the rapid-solidification melt-spinning (MS) technique. Through MS, we confirm that silicide precipitates are dispersed homogenously in the Si matrix with desired nanoscale sizes. In the final part, we show a promising new metal silicide of YbSi2 for thermoelectrics, which exhibits an exceptionally high power factor at room temperature.
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Chen, Gang. "Heat Transport in Superlattices and Nanocomposites for Thermoelectric Applications". Advances in Science and Technology 46 (październik 2006): 104–10. http://dx.doi.org/10.4028/www.scientific.net/ast.46.104.

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Energy transport in nanostructures differs significantly from macrostructures because of classical and quantum size effects on energy carriers. Experimental results show that the thermal conductivity values of nanostructures such as superlattices are significantly lower than that of their bulk constituent materials. The reduction in thermal conductivity led to a large increase in the thermoelectric figure of merit in several superlattice systems. Materials with a large thermoelectric figure of merit can be used to develop efficient solid-state devices that convert waste heat into electricity. Superlattices grown by thin-film deposition techniques, however, are not suitable for large scale applications. Nanocomposites represent one approach that can lead to high thermoelectric figure merit. This paper reviews the current understanding of thermal conductivity reduction mechanisms in superlattices and presents theoretical studies on thermoelectric properties in semiconducting nanocomposites, aiming at developing high efficiency thermoelectric energy conversion materials.
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Vidakis, Nectarios, Markos Petousis, Lazaros Tzounis, Emmanuel Velidakis, Nikolaos Mountakis i Sotirios A. Grammatikos. "Polyamide 12/Multiwalled Carbon Nanotube and Carbon Black Nanocomposites Manufactured by 3D Printing Fused Filament Fabrication: A Comparison of the Electrical, Thermoelectric, and Mechanical Properties". C 7, nr 2 (23.04.2021): 38. http://dx.doi.org/10.3390/c7020038.

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In this study, nanocomposites with polyamide 12 (PA12) as the polymer matrix and multiwalled carbon nanotubes (MWCNTs) and carbon black (CB) at different loadings (2.5, 5.0, and 10.0 wt.%) as fillers, were produced in 3D printing filament form by melt mixing extrusion process. The filament was then used to build specimens with the fused filament fabrication (FFF) three-dimensional (3D) printing process. The aim was to produce by FFF 3D printing, electrically conductive and thermoelectric functional specimens with enhanced mechanical properties. All nanocomposites’ samples were electrically conductive at filler loadings above the electrical percolation threshold. The highest thermoelectric performance was obtained for the PA12/CNT nanocomposite at 10.0 wt.%. The static tensile and flexural mechanical properties, as well as the Charpy’s impact and Vickers microhardness, were determined. The highest improvement in mechanical properties was observed for the PA12/CNT nanocomposites at 5.0 wt.% filler loading. The fracture mechanisms were identified by fractographic analyses of scanning electron microscopy (SEM) images acquired from fractured surfaces of tensile tested specimens. The nanocomposites produced could find a variety of applications such as; 3D-printed organic thermoelectric materials for plausible large-scale thermal energy harvesting applications, resistors for flexible circuitry, and piezoresistive sensors for strain sensing.
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Chang, Sujie, Xiaomin Wang, Qiaoling Hu, Xigui Sun, Aiguo Wang, Xiaojun Dong, Yu Zhang, Lei Shi i Qilei Sun. "Self-Assembled Nanocomposites and Nanostructures for Environmental and Energy Applications". Crystals 12, nr 2 (17.02.2022): 274. http://dx.doi.org/10.3390/cryst12020274.

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Self-assembled nanocomposites are attracting considerable attention owing to their controllable architectures and self-assembly processes, as well as the increase in worldwide environmental effects and energy needs. Further understanding of the self-assembly procedure for improving environmental and energy applications would advance the design and manufacture of nanomaterials for various applications. These materials can be grouped into major categories for various application fields, including powder photocatalysts, membrane photocatalysts, and thin-film thermoelectric nanomaterials. These self-assembled nanomaterials can be used for environmental and energy applications, such as wastewater purification, hydrogen production by water splitting, energy storage, and energy harvesting. In this review, a brief introduction to the definitions and classifications of self-assembled nanocomposites is provided. We aim to provide a summary of the recent research related to self-assembled nanocomposites and nanostructures used for environmental and energy applications. Moreover, typical examples and discussions are aimed at demonstrating the advantages of self-assembled nanostructures. At the end of each section, the structural properties and the application of the nanocomposite or nanostructure are summarized. Finally, we provide perspectives for future research on the design and fabrication of self-assembled nanocomposites and nanostructures.
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Tzounis, Lazaros, Markos Petousis, Sotirios Grammatikos i Nectarios Vidakis. "3D Printed Thermoelectric Polyurethane/Multiwalled Carbon Nanotube Nanocomposites: A Novel Approach towards the Fabrication of Flexible and Stretchable Organic Thermoelectrics". Materials 13, nr 12 (26.06.2020): 2879. http://dx.doi.org/10.3390/ma13122879.

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Three-dimensional (3D) printing of thermoelectric polymer nanocomposites is reported for the first time employing flexible, stretchable and electrically conductive 3D printable thermoplastic polyurethane (TPU)/multiwalled carbon nanotube (MWCNT) filaments. TPU/MWCNT conductive polymer composites (CPC) have been initially developed employing melt-mixing and extrusion processes. TPU pellets and two different types of MWCNTs, namely the NC-7000 MWCNTs (NC-MWCNT) and Long MWCNTs (L-MWCNT) were used to manufacture TPU/MWCNT nanocomposite filaments with 1.0, 2.5 and 5.0 wt.%. 3D printed thermoelectric TPU/MWCNT nanocomposites were fabricated through a fused deposition modelling (FDM) process. Raman and scanning electron microscopy (SEM) revealed the graphitic nature and morphological characteristics of CNTs. SEM and transmission electron microscopy (TEM) exhibited an excellent CNT nanodispersion in the TPU matrix. Tensile tests showed no significant deterioration of the moduli and strengths for the 3D printed samples compared to the nanocomposites prepared by compression moulding, indicating an excellent interlayer adhesion and mechanical performance of the 3D printed nanocomposites. Electrical and thermoelectric investigations showed that L-MWCNT exhibits 19.8 ± 0.2 µV/K Seebeck coefficient (S) and 8.4 × 103 S/m electrical conductivity (σ), while TPU/L-MWCNT CPCs at 5.0 wt.% exhibited the highest thermoelectric performance (σ = 133.1 S/m, S = 19.8 ± 0.2 µV/K and PF = 0.04 μW/mK2) among TPU/CNT CPCs in the literature. All 3D printed samples exhibited an anisotropic electrical conductivity and the same Seebeck coefficient in the through- and cross-layer printing directions. TPU/MWCNT could act as excellent organic thermoelectric material towards 3D printed thermoelectric generators (TEGs) for potential large-scale energy harvesting applications.
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Kim, Jun Yeob, Jin Young Oh i Tae Il Lee. "Multi-dimensional nanocomposites for stretchable thermoelectric applications". Applied Physics Letters 114, nr 4 (28.01.2019): 043902. http://dx.doi.org/10.1063/1.5080622.

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Díez-Pascual, Ana M. "Environmentally Friendly Synthesis of Poly(3,4-Ethylenedioxythiophene): Poly(Styrene Sulfonate)/SnO2 Nanocomposites". Polymers 13, nr 15 (25.07.2021): 2445. http://dx.doi.org/10.3390/polym13152445.

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Conductive poly(3,4-ethylenedioxythiophene):poly(styrene sulfonate) (PEDOT:PSS) is widely used for practical applications such as energy conversion and storage devices owing to its good flexibility, processability, high electrical conductivity, and superior optical transparency, among others. However, its hygroscopic character, short durability, and poor thermoelectric performance compared to inorganic counterparts has greatly limited its high-tech applications. In this work, PEDOT:PSS/SnO2 nanocomposites have been prepared via a simple, low cost, environmentally friendly method without the use of organic solvents or compatibilizing agents. Their morphology, thermal, thermoelectrical, optical, and mechanical properties have been characterized. Electron microscopy analysis revealed a uniform dispersion of the SnO2 nanoparticles, and the Raman spectra revealed the existence of very strong SnO2-PEDOT:PSS interactions. The stiffness and strength of the matrix gradually increased with increasing SnO2 content, up to 120% and 65%, respectively. Moreover, the nanocomposites showed superior thermal stability (as far as 70 °C), improved electrical conductivity (up to 140%), and higher Seebeck coefficient (about 80% increase) than neat PEDOT:PSS. On the other hand, hardly any change in optical transparency was observed. These sustainable nanocomposites show considerably improved performance compared to commercial PEDOT:PSS, and can be highly useful for applications in energy storage, flexible electronics, thermoelectric devices, and related fields.
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Veeman, Dhinakaran, M. Varsha Shree, P. Sureshkumar, T. Jagadeesha, L. Natrayan, M. Ravichandran i Prabhu Paramasivam. "Sustainable Development of Carbon Nanocomposites: Synthesis and Classification for Environmental Remediation". Journal of Nanomaterials 2021 (18.09.2021): 1–21. http://dx.doi.org/10.1155/2021/5840645.

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Composite materials with carbon nanotube and graphene attachments have been regarded as promising prospects. Carbon nanocomposites have gained considerable interest in different fields including biomedical applications due to its exceptional structural dimensions and outstanding mechanical, electrical, thermal, optical, and chemical characteristics. The significant advances made in carbon nanocomposite over past years along with the discovery of new nanocomposite processing technologies to improvise the functional impact of nanotube and graphene composites by providing proper methods of synthesis and improving the production of diverse composite based on carbon nanomaterials are discussed. Carbon nanocomposites are applied in various fields such as aviation, batteries, chemical industry, fuel cell, optics, power generation, space, solar hydrogen, sensors, and thermoelectric devices. The recent design, fabrication, characteristics, and applications of carbon nanocomposites such as active carbon, carbon black, graphene, nanodiamonds, and carbon nanotubes are explained in detail in this research. It is found that unlike traditional fiber composites, Van der Waals force interfacial compounds have an important effect on the mechanical performance of carbon nanomaterial-based composites.
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Nozariasbmarz, Amin, Jerzy S. Krasinski i Daryoosh Vashaee. "N-Type Bismuth Telluride Nanocomposite Materials Optimization for Thermoelectric Generators in Wearable Applications". Materials 12, nr 9 (10.05.2019): 1529. http://dx.doi.org/10.3390/ma12091529.

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Thermoelectric materials could play a crucial role in the future of wearable electronic devices. They can continuously generate electricity from body heat. For efficient operation in wearable systems, in addition to a high thermoelectric figure of merit, zT, the thermoelectric material must have low thermal conductivity and a high Seebeck coefficient. In this study, we successfully synthesized high-performance nanocomposites of n-type Bi2Te2.7Se0.3, optimized especially for body heat harvesting and power generation applications. Different techniques such as dopant optimization, glass inclusion, microwave radiation in a single mode microwave cavity, and sintering conditions were used to optimize the temperature-dependent thermoelectric properties of Bi2Te2.7Se0.3. The effects of these techniques were studied and compared with each other. A room temperature thermal conductivity as low as 0.65 W/mK and high Seebeck coefficient of −297 μV/K were obtained for a wearable application, while maintaining a high thermoelectric figure of merit, zT, of 0.87 and an average zT of 0.82 over the entire temperature range of 25 °C to 225 °C, which makes the material appropriate for a variety of power generation applications.
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Rozprawy doktorskie na temat "Nanocomposites for thermoelectric applications"

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GALLIANI, DANIELA. "Poly(3,4-ethylendioxythiophene) based materials for thermoelectric applications". Doctoral thesis, Università degli Studi di Milano-Bicocca, 2018. http://hdl.handle.net/10281/199131.

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I polimeri intrinsecamente conduttori sono una classe di materiali con caratteristiche uniche. In quanto materiali polimerici sono leggeri e flessibili, possono essere facilmente processati e stampati. Al contempo, però, possono condurre corrente elettrica, raggiungendo anche conducibilità metalliche. Questa combinazione eccezionale ha consentito lo sviluppo di dispositivi elettronici stampati e flessibili, i quali risultano interessanti nell’ambito dei dispositivi portabili, sia integrati nel corpo umano sia indossabili. L’applicazione termoelettrica di questi polimeri conduttori ha recentemente guadagnato rilievo in campo scientifico. Un dispositivo termoelettrico (organico) può convertire il calore in energia elettrica grazie all’effetto Seebeck. Il dispositivo può così recuperare il calore di scarto dissipato in tutti i processi che coinvolgono il consumo di energia e trasformarlo in energia utilizzabile. Anche se i polimeri conduttori hanno già mostrato interessanti proprietà termoelettriche, il loro utilizzo in questo campo è ancora molto limitato per via delle basse efficienze di conversione termoelettrica raggiunte finora, che impediscono a questi materiali di essere competitivi con i più diffusi materiali inorganici per questa applicazione, ovvero i tellururi. Il design di un polimero conduttore che abbia elevate prestazioni termoelettriche parte necessariamente da una conoscenza approfondita di quali tecniche e trattamenti influenzino le proprietà finali di trasporto di carica. La complessità intrinseca di questi sistemi, tuttavia, rende spesso difficoltoso ottenere queste informazioni, impedendo la comprensione di fenomeni coinvolti. Questo progetto di dottorato ha riguardato lo studio dell’impatto di diversi parametri sulle proprietà termoelettriche dei polimeri conduttori, con lo scopo di raggiungere una comprensione approfondita di come il trasporto di carica ne venga influenzato. Nello specifico, lo studio ha riguardato il poli(3,4-etilendiossitiofene) -PEDOT-, il quale è stato studiato modificando diversi parametri a tre livelli di perturbazione del sistema. In primo luogo, un’indagine è stata svolta sul ruolo delle condizioni di polimerizzazione e su quello dei trattamenti effettuati dopo la polimerizzazione. In particolare, è stata studiata l’influenza di diverse tecniche di polimerizzazione, diversi ossidanti e diversi solventi sulla vi qualità finale del film polimerico. Inoltre, il livello di ossidazione del PEDOT è stato modificato dopo la polimerizzazione, ottenendo un’ottimizzazione dell’efficienza termoelettrica. Ad un secondo livello di perturbazione, la struttura molecolare del monomero è stata modificata per preparare un copolimero. Il copolimero includeva una porzione centrale coniugata (e quindi, conduttiva) e due porzioni laterali non coniugate (isolanti), che hanno comportato una modifica sostanziale delle proprietà di trasporto del materiale finale. I risultati ottenuti sulla nuova struttura mostrano la versatilità di questa strategia e come le proprietà di trasporto possano essere finemente modificate grazie all’introduzione di modifiche della struttura molecolare. Infine, al terzo livello, le proprietà macroscopiche del PEDOT sono state modificate grazie all’introduzione di nanostrutture di natura inorganica. Questa strategia è solitamente utilizzata per migliorare l’efficienza termoelettrica dei materiali inorganici, grazie agli effetti benefici dovuti alla nanostrutturazione. Due tipologie diverse di nanoparticelle di ossidi metallici (CuO e Mn3O4) sono state sintetizzate in diverse forme e dimensioni e introdotte nella matrice di PEDOT in diverse concentrazioni. Grazie allo studio dell’effetto dell’umidità sulle proprietà di trasporto ed allo studio sulla variazione dello stato di ossidazione è stato possibile ottenere nuove informazioni sul comportamento elettrico dei nanocompositi.
Intrinsically conductive polymers (ICPs) are a class of organic materials characterized by unique features. They are lightweight, flexible and easy to process and print, as expected from polymers, but, also, they can conduct electricity up to metallic conductivities. Such an exceptional pairing of characteristics enables the development of flexible and printed electronic devices, which are of a particularly appealing for portable electronic devices, even integrated in the human body (e.g. implantable biosensors) or worn (e.g. smartwatches). Even thermoelectric (TE) application of ICPs recently gained a lot of attention. An organic TE generator (OTEG) can convert heat into electrical energy by means of the Seebeck effect. This technology aims to recover heat produced as low-grade side-product of energy consumption and to transform it into exploitable energy. Even though ICPs showed promising TE properties, their use is still hindered by low TE efficiencies, which cannot compete with the inorganic benchmark (i.e. tellurides). The design of better ICPs for TE application must start from a deep knowledge of which techniques and treatments impact the charge transport features. The intrinsic complexity of ICP systems, however, often makes this task difficult, preventing a full comprehension of the phenomena involved. This PhD project focused on the impact of different parameters on TE properties of ICPs, aiming at the needed deeper understanding on how charge transport is affected. The specific ICP poly(3,4-ethylendioxythiophene) -PEDOT- was investigated modifying different parameters at three different levels of system perturbation. First, the role of polymerization conditions and post-polymerization treatments was studied. Different polymerization techniques, oxidants and solvents have been used for the same ICP, and the occurring changes have been investigated. Moreover, PEDOT oxidation level was tuned to optimize TE efficiency. At a second level, the monomer molecular structure was modified to prepare a PEDOT-based copolymer. The copolymer included conjugated (i.e. conductive) and not conjugated (i.e. not conductive) portions, which deeply impacted the charge transport behaviour. The results show the versatility of this strategy, still barely explored in TE field, and how final transport properties can be finely tuned by means of molecular modifications. Finally, at a third level, PEDOT macroscopic features were tuned by embedding inorganic nanostructure. Such a strategy is usually exploited to improve TE efficiency by means of nanostructuration beneficial effects already known in inorganic materials. Nanoparticles of two different metal oxides (CuO and Mn3O4) of different size and shape were dispersed in PEDOT matrix. Evaluation of humidity and oxidation level effects on charge transport features allowed to obtain novel insights into transport properties in nanocomposites.
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Hsieh, Yu-Yun. "Nanostructured Carbon-Based Composites for Energy Storage and Thermoelectric Applications". University of Cincinnati / OhioLINK, 2019. http://rave.ohiolink.edu/etdc/view?acc_num=ucin157322525150617.

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Hao, Qing. "Nanocomposites as thermoelectric materials". Thesis, Massachusetts Institute of Technology, 2010. http://hdl.handle.net/1721.1/61606.

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Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 2010.
Cataloged from PDF version of thesis.
Includes bibliographical references.
Thermoelectric materials have attractive applications in electric power generation and solid-state cooling. The performance of a thermoelectric device depends on the dimensionless figure of merit (ZT) of the material, defined as ZT = S2o-T / k, where S is the Seebeck coefficient, o is the electrical conductivity, k is the thermal conductivity, and T is the absolute temperature. In recent years, the idea of using nanotechnology to further improve the figure of merit of conventional thermoelectric materials has triggered active research and led to many exciting results. Most of the reported ZT enhancements are based on thin films and nanowires in which the thermal conductivity reduction plays a central role. We pursue the nanocomposite approach as an alternative to superlattices in the quest for high ZT materials. These nanocomposites are essentially nano-grained bulk materials that are synthesized by hot pressing nanoparticles into a bulk form. The interfaces inside a nanocomposite strongly scatter phonons but only slightly affect the charge carrier transport. Therefore, we can significantly reduce the lattice thermal conductivity and even somewhat increase the power factor S2 U, resulting in higher ZT than for bulk materials. Compared with expensive thin-film superlattices, nanocomposites will have significant advantages in mass production, device construction and operation. This thesis covers my studies on bismuth antimony telluride nanocomposites and some recent work on Co 4Sb12-based nanocomposites. In bismuth antimony telluride nanocomposites, we have achieved a peak ZT of 1.4 at 100 'C, a 40% increase in ZT over the bulk material. This is the first significant ZT increase in this material system in fifty years. The same approach has also yielded a peak ZT around 1.2 in Yb filled Co4Sbi 2 nanocomposites. During the process, great efforts were dedicated to assuring accurate and dependable property measurements of thermoelectric nanocomposites. In addition to comparing measurement results between the commercial setups and a homebuilt measurement system, the high ZT obtained in bismuth antimony telluride nanocomposites was further confirmed by a device cooling test. To better understand the measured thermoelectric properties of nanocomposites, theoretical analysis based on the Boltzmann transport equation was performed. Furthermore, frequency-dependent Monte Carlo simulations of the phonon transport were conducted on 2D periodic porous silicon and 3D silicon nanocomposites. In the thermoelectrics field, the latter one provided the first accurate prediction for phonon size effects in a given nanocomposite. For charge carriers in thermoelectric nanocomposites, their transport can be significantly affected by the interfacial electronic states. To address this, impedance measurements were conducted on nanocomposites to determine the electronic barrier height at the grain interfaces, which is critical for the detailed theoretical analysis of the interfacial charge transport and energy conversion processes. Although large amount of work has been done using this technique to understand the defect states and the barrier height on the grain boundaries of polycrystalline silicon or oxides, this method has not been applied to thermoelectric materials. Along another line, a simple bandgap measurement technique with nanopowders was developed based on the Fourier Transform Infrared Spectroscopy. This provided a convenient way to quickly check the bandgaps of various thermoelectric nanocomposites, which is also crucial for theoretical studies.
by Qing Hao.
Ph.D.
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Muto, Andrew (Andrew Jerome). "Device testing and characterization of thermoelectric nanocomposites". Thesis, Massachusetts Institute of Technology, 2008. http://hdl.handle.net/1721.1/44915.

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Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 2008.
This electronic version was submitted by the student author. The certified thesis is available in the Institute Archives and Special Collections.
Includes bibliographical references (p. 67-68).
It has become evident in recent years that developing clean, sustainable energy technologies will be one of the world's greatest challenges in the 21st century. Thermoelectric materials can potentially make a contribution by increasing energy efficiency of some systems. Thermoelectric materials may play a role in the large scale energy industry, specifically in the applications of refrigeration and waste heat recovery. In this work a novel thermoelectric material will be tested for conversion efficiency. A Bi₂Te₃ nanocomposite has been developed by the joint effort of Prof. Gang Chen's group at MIT and Prof. Zhifeng Ren's group at Boston College. The material exhibits enhanced thermoelectric properties from optimized nanoscale structures and can be easily manufactured in large quantities. In order to better characterize its performance a novel power conversion measurement system has been developed that can measure the conversion efficiency directly. The measurement system design will be described in detail; important design considerations will be addressed such as measuring heat flux, optimizing the load matching condition and reducing electrical contact resistance. Finally the measured efficiency will be compared to the calculated efficiency from a temperature-dependent properties model. It will be shown that a Ni layer must be attached to the nanocomposite to allow soldering and power conversion testing. Results of this work will show that the nanocomposite efficiency is higher than the commercial standard. Electrical contact remains a challenge in realizing the potential efficiency.
by Andrew Muto.
S.M.
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Доброжан, Олександр Анатолійович, Александр Анатольевич Доброжан, Oleksandr Anatoliiovych Dobrozhan, Анатолій Сергійович Опанасюк, Анатолий Сергеевич Опанасюк, Anatolii Serhiiovych Opanasiuk, Денис Ігорович Курбатов i in. "Thermoelectric properties of the colloidal Bi2S3-based nanocomposites". Thesis, Jadavpur University, 2017. http://essuir.sumdu.edu.ua/handle/123456789/65347.

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In this work we present the proof of the concept of the novel strategy to improve the thermoelectric properties of Bi2S3based nanostructured bulk materials by blending the metallic nanoinclustions with the semiconductor nanoparticles forming the nanocomposites (NCts). The obtained NCts were composed of Bi2S3nanorods (length - 100 nm and width – 10 nm) and Ag nanoparticles (diameter - 2- 3 nm) synthesized by colloidal method. The morpohology, phase and chemical composition, electrical conductivity and Seebeck coefficient of NCts were investigated by using transmission electron microscopy (TEM), X-ray diffraction, energy dispersive X-ray analysis (EDAX), 4-point probes method and static dc-method. This strategy is the perspective way to improve the conversion efficiency of others thermoelectric materials.
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Lee, Hohyun 1978. "Modeling and characterization of thermoelectric properties of SiGe nanocomposites". Thesis, Massachusetts Institute of Technology, 2009. http://hdl.handle.net/1721.1/50589.

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Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 2009.
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Includes bibliographical references.
Direct energy conversion between thermal and electrical energy based on thermoelectric effects is attractive for potential applications in waste heat recovery and environmentally-friendly refrigeration. The energy conversion efficiency is related to the thermoelectric figure of merit ZT, which is proportional to the electrical conductivity, the square of the Seebeck coefficient, and the inverse of the thermal conductivity. Currently, the low ZT values of available materials restrict the large scale applications of this technology. Recently, however, significant enhancements in ZT were reported in nanostructured materials such as superlattices mainly due to their low thermal conductivities. According to the studies on heat transfer mechanisms in nanostructures, the reduced thermal conductivity of nanostructures is mainly attributed to the increased scattering of phonons at interfaces. Based on this idea, nanocomposites are also expected to have a lower thermal conductivity than their bulk counterparts of the same chemical configuration. Nanocomposites are materials with constituents of less than 100 nm in size. They can be fabricated with a low cost just by mixing nano sized particles followed by consolidation of nano sized powders. In this thesis, SiGe nanocomposites are investigated for power generation at high temperature. The material properties are characterized at different temperatures, and the optimized process conditions are explored experimentally. In addition, theoretical studies are carried out for better understanding of transport phenomena and our experimental results.
(cont.) Grain boundaries in nanocomposites can scatter phonons, when their mean free paths are longer than the grain size. Mean free paths of electrons are usually shorter than the grain size of nanocomposites, so that the electrical conductivities of nanocomposites are not expected to change significantly. However, the experimental results show that nanostructures indeed affect electron transport. The grain boundary effects on electron transport are investigated to explain the experiments. Furthermore, the effects of nanosized pores are explored. Our experimental results show that pores in nanocomposites degrade the electrical conductivity more than predicted by effective medium theories. A scattering model is developed to understand the transport phenomena in porous materials. These modeling studies can also be used to guide sample preparation conditions.
by Hohyun Lee.
Ph.D.
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Yelgel, Ovgu Ceyda. "Thermoelectric properties of V-VI semiconductor alloys and nanocomposites". Thesis, University of Exeter, 2013. http://hdl.handle.net/10871/14110.

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Thermoelectric materials are materials which are capable of converting heat directly into electricity and vice versa. They have long been used in electric power generation and solid-state cooling. The performance of a thermoelectric device determined by the dimensionless figure of merit (ZT) of the material, defined as ZT = (S2 σ/κ)T, where S is the Seebeck coefficient, σ is the electrical conductivity, κ is the total thermal conductivity, and T is the absolute temperature. The total thermal conductivity consists of contribution from electrons, electron-hole pairs and phonons. Since the 1960s, the best thermoelectric material has been Bi2Te3 alloys, with a ZT of 1.0 at room temperature. In recent years, the idea of using nanotechnology has opened up the possibility of engineering materials at nanoscale dimensions to achieve higher values of ZT in other words to have more efficient thermoelectric devices. This thesis starts with a broad introduction to thermoelectricity including various thermoelectric effects and their applications. The state-of-the-art thermoelectric materials and the optimisation methods to enhance the value of ZT have also been reviewed. A systematic theoretical modelling of the thermoelectric properties of three dimensional bulk semiconductors has been presented in Chapter 2. Electronic properties (Fermi level, Seebeck coefficient, and electrical resistivity) and thermal conductivity contribution from carriers (donor electrons or acceptor holes) have been derived by using the nearly-free electron approximation and the Fermi-Dirac statistics. Other thermal conductivity contributions originated from electron-hole pairs and phonons have also been described in detail. In Chapter 3, this theoretical study is extended to two dimensional semiconducting quantum well structures bearing in mind that the Fermi level should change with the temperature as well as the quantum well width and additional interface scattering mechanisms (interface mass-mixing and interface dislocation scatterings) should be included for the definition of anharmonic scattering rate. Thermoelectric properties of n-type (Bi2Te3)0.85(Bi2Se3)0.15 single crystals doped with 0.1 wt.% CuBr and 0.2 wt.% SbI3 and p-type (Bi2Te3)x(Sb2Te3)1−x single crystals doped with 3 wt.% Te (0.18 ≤ x ≤ 0.26) have been explored in Chapter 4 and 5, respectively. It has been found that p-type Bi2Te3 based alloys showed higher values of ZT due to their larger power factor (S2σ) and smaller thermal conductivity values. These calculations have concluded that the influence of the composition range of semiconductor alloys together with its type and amount of dopant plays an important role in enhancing the ZT. In Chapter 6, a detailed theoretical investigation and comparision of the thermal conductivities of these single crystals have been reported including frequency dependence of the phonon thermal conductivity for different temperatures. In Chapter 7, based on temperature and well width dependent Fermi level, a full theory of thermoelectric properties has been investigated for n-type 0.1 wt.% CuBr doped Bi2Se3/Bi2Te3/Bi2Se3 and p-type 3 wt.% Te doped Sb2Te3/Bi2Te3/Sb2Te3 quantum well systems. Different values of well thicknesses have been considered for both types of quantum well systems to study the effect of confinement on all thermoelectric transport coefficients. It has been found that reducing the well thickness has a pronounced effect on enhancing the ZT. Compared to bulk single crystals studied in Chapter 4 and 5, significantly higher thermoelectric figure of merits have been estimated theoretically for both n- and p-type semiconducting quantum well systems. For the n-type Bi2Se3/Bi2Te3/Bi2Se3 quantum well system with taking 7 nm well width the maximum value of ZT has been estimated to be 0.97 at 350 K and for the p-type Sb2Te3/Bi2Te3/Sb2Te3 quantum well with well width 10 nm the highest value of the ZT has been found to be 1.945 at 440 K. Chapter 8 briefly recapitulates the results presented in this thesis and outlines possibilities for future work.
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Dai, Prè Marta/M. "Nanocomposites for optical applications". Doctoral thesis, Università degli studi di Padova, 2012. http://hdl.handle.net/11577/3422168.

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Nanotechnology is one of the most important fields in the last decades because novel material development involve chemistry, physics, the medicine and also engineering science. Nanomaterials exhibit size-dependent properties and large surface to volume ratio which can be exploited in a number of applications especially in the optical field. The main work presented here regards the synthesis of the nanocomposites using different methods, according to the desidered quality of the final material, the easiness and the industrial processability, the size control distribution and the homogeneous dispersibility. The whole activity of my thesis project can be divided in two parts: a) nanoparticles and nanocomposites for photovoltaic applications; b)NIR emitting nanoparticles and nanocomposites. The first part was partially founded by an European project, ORION, entitled "Optimization of Si solar cells, plastic materials and technologies for the development of more efficient concentRatION photovoltaic systems". The main objective of this project is base on the optimization of materials and technologies involved in Concentration PhotoVoltaic System production in order to reduce the system cost/watt and increase the system efficiency. The goal of my work is to study and develop plastic nanocomposites doped with down-converting nanoparticles for modification of the solar spectrum in order to enhance the absorption efficiency of solar cells. The functional properties of the obtained materials have to be fine-tuned to fulfil the customers' needs in terms of process ability and performance. The material must have good optical properties such as, transmittance of 85-90% for 1-2 mm and light-conversion from 300-500 nm to 600-900 nm. The most important polymers for optical applications is Polymethyl Methacrylate (PMMA). Different kinds of NPs, ZnS:Mn, CdS:Mn and ZnO, that absorb in the UV range and emit in the visible range, have been synthesized with different colloidal techniques. Precipita\-tion-redispersion protocols have been set up in order to purify and concentrate the particles and transfer them into a suitable organic solvent to direct mixing with the polymer. Furthermore the major part of the energy losses (~52%) is related to the spectral mismatch, known as thermal or quantum losses. A large part of high-energy photons is lost as heat through phonon scattering, resulting in the limitation of power conversion efficiency of Si solar cells. The ultraviolet (UV) part of the solar spectrum (about 7% of the entire solar spectrum) cannot efficiently be used by Si solar cells. So coating of the same nanoparticles were deposited on the front surface of solar cells and comparative electro-optical characterizations have been performed before and after the deposition of the nanostructures to determine the effect of antireflection and down-shifting on the efficiency. The second part of the work was focused on the synthesis of PbSe nanoparticles (Quantum Dots) and core-shell nanoparticles with a PbSe core and a CdSe shell in order to increase the stability of emission properties of such materials. Then these nanoparticles were introduced in several matrix like Ormocer and PMMA keeping the photoluminescence properties. The future applications are optical microcavity incorporating quantum dots and lithography.
Negli ultimi anni le nanotecnologie sono diventate uno dei maggiori campi di interesse e di rilevanza scientifica e la ricerca di nuovi materiali riguarda la chimica, la fisica, la medicina e anche l'ingegneria. I nanomateriali vengono classificati in base alla loro dimensione ed al rapporto superficie/volume, caratteristiche che permettono il loro impiego in numerose applicazioni, soprattutto nel campo ottico. In questi lavoro di tesi sono stati valutati differenti nanocompositi sintetizzati con tecniche messe a punto in modo tale da ottenere peculiari caratteristiche di dimensione, distribuzione, omogeneità e di facile produzione, anche a livello industriale. Il progetto di dottorato può essere suddiviso in due parti: a) nanoparticelle e nanocompositi per applicazioni nel fotovoltaico; b) nanoparticelle e nanocompositi che emettono nel NIR. La prima parte del lavoro si inserisce nel progetto Europeo ORION, ovvero "ottimizzazione di celle solari al silicio, materiali plastici e tecnologie per lo sviluppo di più efficienti sistemi fotovoltaici a concentrazione". Ha riguardato principalmente la messa a punto di materiali e di tecnologie dei sistemi a concentrazione tali da riuscire a ridurre il rapporto costo/watt ed aumentare l'efficienza. Sono stati quindi studiati e sviluppati nanocompositi plastici contenenti nanoparticelle che sono in grado di modificare lo spettro solare e di aumentare di conseguenza l'efficienza di assorbimento delle celle solari. Inoltre le proprietà funzionali dei materiali sviluppati sono state messe a punto in termini di processabilità e di prestazioni. Infatti il materiale deve avere buone proprietà ottiche tra cui una trasmittanza dell'85-92% per 1-2 mm di spessore ed una conversione della luce nel range tra 300-500 nm e 600-900 nm. Il polimetilmetacrilato (PMMA) è risultato essere il polimero di selezione per applicazioni ottiche. Diversi tipi di nanoparticelle che assorbono nell'UV, tra cui ZnS:Mn, CdS:Mn e ZnO, sono state sintetizzate utilizzando tecniche colloidali. Sono stati messi a punto protocolli di precipitazione-ridispersione in modo da purificare, concentrare le nanoparticelle e ridisperdere in seguito in appositi solventi organici, dove è solubile anche il PMMA. Dal momento che la maggior parte dell'energia dissipata (~ 52%) dipende dal mismatch spettrale, definito come perdita termica o quantica, mentre la grande parte ad alta energia viene persa sotto forma di calore legato allo scattering di fotoni e quindi riduce maggiormente l'efficienza di conversione dell'energia delle celle solari a base di silicio. La parte dell'ultravioletto (UV) dello spettro solare (circa 7% dell'intero spettro) non può essere sfruttato completamente dalle celle solari al Si. Sono state così valutate le caratteristiche elettro-ottiche prima e dopo deposizione sulla superficie delle celle solari delle stesse nanoparticelle inserite nel polimero determinando l'effetto antiriflesso e della down-shifting sull'efficienza. La seconda parte del lavoro si è focalizzata sulla sintesi di nanoparticelle di Seleniuro di Piombo (PbSe) and di core-shell, dove l'interno di PbSe è rivestito da uno strato di CdSe, così da stabilizzare le proprietà di emissione di questi materiali. Infine queste nanoparticelle sono state incorporate in diverse matrici, tra cui Ormocer e PMMA mantenendo le loro proprietà di luminescenza. Questi nuovi materiali trovano future applicazioni in microcavità ottiche che incorporano quantum dots e litografia.
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Akdogan, Volkan. "Thermoelectric power generator for automotive applications". Thesis, University of Nottingham, 2016. http://eprints.nottingham.ac.uk/37702/.

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A thermoelectric generator (TEG) converts thermal energy into electrical energy corresponding to temperature gradient across both hot and cold surfaces with a conversion efficiency of approximately 5%. In spite of the conversion efficiency, TEGs can be implemented effectively for waste heat recovery systems within the power rating of kilowatts. The insufficiency of natural resources, frequently increasing oil costs and emission regulations have become an incentive factor of the recent increased interest in TEG applications. This thesis introduces a practical implementation of the thermoelectric generator for an automotive exhaust system which has a rapid transient response to produce electrical energy from the waste heat which flows through the exhaust pipe. In addition to automotive TE power generator implementation, an H-Bridge DC-DC converter within the operation of maximum power point tracking method is introduced in this thesis to obtain the maximum power transfer between the thermoelectric power generator and the load. This thesis presents a transient solution to the two-dimensional heat transfer equation with variant ambient temperature that determines heat transfer and electrical potential across the thermoelectric pellet. This equation is applied into a designed two-dimensional heat transfer MATLAB model and a comparison of simulation and experimental results approves the accuracy of the designed model. In addition to heat transfer simulation, a dynamic large scale thermoelectric power generator simulation program is introduced in this thesis to provide data analysis of actual implementation.
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Alothman, Abdulmohsen Abdulrahman. "Modeling and Applications of Thermoelectric Generators". Diss., Virginia Tech, 2016. http://hdl.handle.net/10919/79846.

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We develop a simplified one-dimensional numerical model that simulates the performance of thermoelectric generators (TEG). The model is based on the energy and electrical potential field equations. The Seebeck coefficient, thermal conductivity, electrical resistivity and Thomson coefficient of the TEG material are used to predict the harvested power. Bismuth-telluride is used as semiconductors materials of the TEG, which is the most commonly used material by industry. Experiments on three TEG modules were performed to validate the numerical model. A comparison with predicted levels of harvested energy based on the TEG specifications is also performed. The results show differences between the experimental and numerical values on one hand and the predicted ones on the other hand. The reason for these differences are discussed. A procedure to estimate the sensitivity of the harvested power to different inputs and TEG parameters is detailed. In the second part of the dissertation, we integrate a thermoelectric generator with an organic storage device. The performance of the integrated system for different values of load resistances and temperature gradients is determined. Finally, we demonstrate that power generated from a TEG is related to the flow rate in a pipe and can, thus, be used as a flow meter. Particularly, a dimensionless relation between the TEG's peak power and Reynolds number is determined.
Ph. D.
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Książki na temat "Nanocomposites for thermoelectric applications"

1

Jayatissa, Ahalapitiya. Applications of Nanocomposites. Boca Raton: CRC Press, 2022. http://dx.doi.org/10.1201/9781003247074.

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Zlatić, Veljko, i Alex C. Hewson, red. Properties and Applications of Thermoelectric Materials. Dordrecht: Springer Netherlands, 2009. http://dx.doi.org/10.1007/978-90-481-2892-1.

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Fesenko, Olena, i Leonid Yatsenko, red. Nanocomposites, Nanostructures, and Their Applications. Cham: Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-030-17759-1.

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Fesenko, Olena, i Leonid Yatsenko, red. Nanocomposites, Nanophotonics, Nanobiotechnology, and Applications. Cham: Springer International Publishing, 2015. http://dx.doi.org/10.1007/978-3-319-06611-0.

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Thomas, Sabu. Rubber nanocomposites: Preparation, properties, and applications. Singapore: John Wiley & Sons, 2010.

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Tripathy, Deba Kumar, i Bibhu Prasad Sahoo, red. Properties and Applications of Polymer Nanocomposites. Berlin, Heidelberg: Springer Berlin Heidelberg, 2017. http://dx.doi.org/10.1007/978-3-662-53517-2.

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Thomas, Sabu. Rubber nanocomposites: Preparation, properties, and applications. Hoboken, N.J: Wiley, 2010.

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NATO, Advanced Research Workshop on Properties and Applications of Thermoelectric Materials (2008 Hvar Croatia). Properties and applications of thermoelectric materials: The search for new materials for thermoelectric devices. Dordrecht: Springer, 2009.

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NATO Advanced Research Workshop on Properties and Applications of Thermoelectric Materials (2008 Hvar, Croatia). Properties and applications of thermoelectric materials: The search for new materials for thermoelectric devices. Dordrecht: Springer, 2009.

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Zlatic, Veljko, i Alex Hewson, red. New Materials for Thermoelectric Applications: Theory and Experiment. Dordrecht: Springer Netherlands, 2013. http://dx.doi.org/10.1007/978-94-007-4984-9.

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Części książek na temat "Nanocomposites for thermoelectric applications"

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Gregory, Otto J., Ximing Chen, Matin Amani, Brian Monteiro i Andrew Carracia. "Thin Film Nanocomposites for Thermoelectric Applications". W Ceramic Transactions Series, 111–24. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2010. http://dx.doi.org/10.1002/9780470931011.ch11.

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Ghafari, Ehsan, Frederico Severgnini, Seyedali Ghahari, Yining Feng, Eu Jin Lee, Chaoyi Zhang, Xiaodong Jiang i Na Lu. "Thermoelectric Nanocomposite for Energy Harvesting". W Multifunctional Nanocomposites for Energy and Environmental Applications, 173–202. Weinheim, Germany: Wiley-VCH Verlag GmbH & Co. KGaA, 2018. http://dx.doi.org/10.1002/9783527342501.ch8.

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Yao, Qin, Lidong Chen i Sanyin Qu. "Conducting Polymer-Based Nanocomposites for Thermoelectric Applications". W Fundamentals of Conjugated Polymer Blends, Copolymers and Composites, 339–78. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2015. http://dx.doi.org/10.1002/9781119137160.ch6.

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Mata-Padilla, José M., Carlos Alberto Ávila-Orta, Víctor J. Cruz-Delgado i Juan G. Martínez-Colunga. "Nanostructured Polymers for Thermoelectric Conversion". W Handbook of Nanomaterials and Nanocomposites for Energy and Environmental Applications, 3393–419. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-36268-3_147.

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Mata-Padilla, José M., Carlos A. Ávila-Orta, Víctor J. Cruz-Delgado i Juan G. Martínez-Colunga. "Nanostructured Polymers for Thermoelectric Conversion". W Handbook of Nanomaterials and Nanocomposites for Energy and Environmental Applications, 1–27. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-11155-7_147-1.

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Lin, Zongqiong, i Qichun Zhang. "Nanostructured Polymers and Polymer/Inorganic Nanocomposites for Thermoelectric Applications". W Polymer-Engineered Nanostructures for Advanced Energy Applications, 559–76. Cham: Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-57003-7_14.

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Chen, Gang. "Heat Transport in Superlattices and Nanocomposites for Thermoelectric Applications". W Mass and Charge Transport in Inorganic Materials III, 104–10. Stafa: Trans Tech Publications Ltd., 2006. http://dx.doi.org/10.4028/3-908158-02-8.104.

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Shalaby, Mustafa, Salwa Hamdy, Ishtihadah Islam, Kulwinder Kaur, Aamer Nazir i Shakeel Ahmad Khandy. "Bulk and Nanocomposite Thermoelectrics: Synthesis, Properties, and Applications". W Advances in Nanocomposite Materials for Environmental and Energy Harvesting Applications, 959–1016. Cham: Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-030-94319-6_31.

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Klobes, Benedikt, Dimitrios Bessas i Raphaël P. Hermann. "High Energy X-ray and Neutron Scattering on Bi2Te3Nanowires, Nanocomposites, and Bulk Materials". W Thermoelectric Bi2Te3Nanomaterials, 119–39. Weinheim, Germany: Wiley-VCH Verlag GmbH & Co. KGaA, 2015. http://dx.doi.org/10.1002/9783527672608.ch7.

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Lan, Yucheng, i Zhifeng Ren. "Thermoelectric Nanocomposites for Thermal Energy Conversion". W NanoScience and Technology, 371–443. Cham: Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-32023-6_11.

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Streszczenia konferencji na temat "Nanocomposites for thermoelectric applications"

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S, Susithra, Anuradha M. Ashok i Manoharan V K. "Perovskite Oxide Nanocomposites for Thermoelectric Applications". W Proceedings of the First International Conference on Combinatorial and Optimization, ICCAP 2021, December 7-8 2021, Chennai, India. EAI, 2021. http://dx.doi.org/10.4108/eai.7-12-2021.2314603.

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Lee, Hohyun, Daryoosh Vashaee, Xiaowei Wang, Giri Joshi, Gaohua Zhu, Dezhi Wang, Zhifeng Ren i in. "Thermoelectric Transport in Silicon Germanium Nanocomposite". W ASME 2008 International Mechanical Engineering Congress and Exposition. ASMEDC, 2008. http://dx.doi.org/10.1115/imece2008-67436.

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Direct energy conversion between heat and electrical energy based on thermoelectric effects is attractive for potential applications in waste heat recovery and environmentally-friendly refrigeration. The energy conversion efficiency depends on the dimensionless figure of merit of thermoelectric materials, ZT, which is proportional to the electrical conductivity, the square of the Seebeck coefficient, and the inverse of the thermal conductivity. Currently, the low ZT values of available materials restrict the applications of this technology. However, significant enhancements in ZT were recently reported in nanostructured materials such as superlattices mainly due to their low thermal conductivities. According to recent studies, the reduced thermal conductivity of nanostructures is attributed to the large number of interfaces at which phonons are scattered. Based on this idea, nanocomposites are expected to have a lower thermal conductivity than their bulk counterparts with low fabrication cost just by mixing nano sized particles. In this work, we will discuss mechanisms of thermoelectric transport via modeling and provide experimental evidence on the enhancement of thermoelectric figure of merit in SiGe-based nanocomposites.
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3

Liang, Xin-wei, Ning-yu Zeng, Jian Li, Zheng-Yong Huang i Jian-ying Zhao. "Bi2Te3/Ti3C2Tx Nanocomposites and Its Thermoelectric Properties Study". W 2022 IEEE International Conference on High Voltage Engineering and Applications (ICHVE). IEEE, 2022. http://dx.doi.org/10.1109/ichve53725.2022.9961477.

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Son, Youngsuk, Monalisa Mazumder i Theodorian Borca-Tasciuc. "Anisotropic Thermal Diffusivity Measurements in Nanostructured Samples Using a Photothermoelectric Technique". W ASME 2006 International Mechanical Engineering Congress and Exposition. ASMEDC, 2006. http://dx.doi.org/10.1115/imece2006-16296.

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Knowledge of the thermal transport properties in thin films and nanostructures is critical for a wide range of applications in microelectronics, photonics, micro-electro-mechanical-systems, and thermoelectrics. The last twenty years have seen significant developments in thin-film thermal characterization techniques. Despite these advances, the characterization of the thermal transport properties in low-dimensional systems remains a challenging task. Recently, thermal properties of nanowire/nanotube nanocomposites such as thermoelectric nanowires and aligned carbon nanotubes (CNT) deposited on silicon substrates or in alumina or polymer matrix have attracted a great interest due to their possible applications in high efficiency thermoelectric energy conversion and thermal management applications. However, a major challenge for thermal characterization of nanowire/nanotube composites is their thermal anisotropy. This work presents measurements of anisotropic thermal properties using a photothermoelectric technique.
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Singh, Dhruv, Jayathi Y. Murthy i Timothy S. Fisher. "Thermal Transport in Finite-Sized Nanocomposites". W ASME 2008 Heat Transfer Summer Conference collocated with the Fluids Engineering, Energy Sustainability, and 3rd Energy Nanotechnology Conferences. ASMEDC, 2008. http://dx.doi.org/10.1115/ht2008-56385.

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We report finite volume simulations of the phonon Boltzmann Transport Equation (BTE) for heat conduction in periodic nanowire composites. Models for phonon transport across heterogeneous interfaces are developed, and simulations are performed over a wide range of Knudsen numbers. Conditions are identified under which the thermal conductivity of the composite material is less than the bulk thermal conductivity of the individual host materials and under which the alloy limit of thermal conductivity is recovered. We also compute the length scale needed to achieve bulk behavior in nanoscale composites. The results of this study are expected to inform and improve applications such as thermoelectric devices and flexible macroelectronics.
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Yang, Ronggui, Gang Chen i Mildred S. Dresselhaus. "Thermal Conductivity of Core-Shell Nanostructures: From Nanowires to Nanocomposites". W ASME 2005 Summer Heat Transfer Conference collocated with the ASME 2005 Pacific Rim Technical Conference and Exhibition on Integration and Packaging of MEMS, NEMS, and Electronic Systems. ASMEDC, 2005. http://dx.doi.org/10.1115/ht2005-72198.

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Core-shell heterostructures could potentially become the building blocks of nanotechnology for electronic and optoelectronic applications. The increased surface or interface area will decrease the thermal conductivity of such nanostructures and impose challenges for the thermal management such devices. In the mean time, the decreased thermal conductivity might benefit the thermoelectric conversion efficiency. In this paper, a generic model is established to study phonon transport in core-shell nanowire structures in the longitudinal direction using the phonon Boltzmann equation. The model can be used to simulate a variety of nanostructures, including nanowires and nanocomposites by changing some of the input parameters. We first report the dependence of the thermal conductivity on the surface conditions and the core-shell geometry for silicon core - germanium shell and tubular silicon nanowires. When the scattering at the outer shell surface in the generic model is assumed to be totally specular, the core-shell nanostructure resembles a simulation unit cell of periodic two-dimensional (2-D) nanocomposites. Thermal conductivity of nanowire composites and cylindrical nanoporous material in longitudinal direction is thus predicted as a function of the size of the nanowires and nanopores, and the volumetric fraction of the constituent materials. Results of this study can be used to direct the development of high efficiency thermoelectric materials.
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Ferrer-Argemi, Laia, Jonathan Sullivan i Jaeho Lee. "Effects of Silicide Inclusion Shape on Thermal Transport of Silicon-Based Nanowires and Nanocomposites for Thermoelectric Applications". W 2019 18th IEEE Intersociety Conference on Thermal and Thermomechanical Phenomena in Electronic Systems (ITherm). IEEE, 2019. http://dx.doi.org/10.1109/itherm.2019.8757263.

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Landry, E. S., i A. J. H. McGaughey. "Designing Si/Si1−xGex Superlattices With Tailored Thermal Transport Properties". W ASME 2008 Heat Transfer Summer Conference collocated with the Fluids Engineering, Energy Sustainability, and 3rd Energy Nanotechnology Conferences. ASMEDC, 2008. http://dx.doi.org/10.1115/ht2008-56473.

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Si/Si1−xGex superlattices are promising candidates for thermoelectric energy conversion applications [1, 2], as the phonon transport through them can be inhibited while maintaining desirable electrical transport properties. No comprehensive experimental study has been performed to map the thermal conductivity design space accessible by Si/Ge nanocomposites. By using atomistic modeling tools, interesting areas of the design space can be identified and then further explored experimentally.
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Celik, Emrah, Cagri Oztan, Yiqun Zhou, Roger LeBlanc, Oguz Genc i Sedat Ballikaya. "Enhancement of Thermoelectric Figure of Merit of Bi2Te3 Using Carbon Dots". W ASME 2018 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2018. http://dx.doi.org/10.1115/imece2018-88280.

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Thermoelectric (TE) energy harvesters are multi-material solid-state devices that convert heat (i.e. a thermal gradient) directly into electric potential. Currently, the biggest challenge limiting the applications of thermoelectric devices is the low conversion efficiency (< 10%). To achieve higher thermoelectric efficiency, electrical conductivity and Seebeck coefficient of thermoelectric materials must be maximized allowing the flow of charge carriers and thermal conductivity must be minimized keeping high temperature gradient between hot and cold sides. These properties are strongly coupled to each other. In other words, improving one property deteriorates the other. In nanoscale however, manipulation of matter at the atomic level can decouple these properties. Nanoengineering is therefore considered to be the only remedy for the low conversion efficiency of thermoelectric materials. Current nanomanipulation techniques focus only on reducing thermal conductivity by scattering heat carrying phonons with nanoscale artifacts. We have observed that doping thermoelectric material with carbon quantum dots (size < 5 nm) tremendously increased electrical conductivity and thermoelectric power. In the control experiments using carbon powder (same chemical arrangement but larger scale, < 100 nm), we did not observe any increase in thermal power density evidencing the nanomanipulation of material properties using carbon quantum dots. Doping thermoelectric materials with carbon quantum dots has high potential due to the quantum enhancement effects on electrical properties of and needs to be further investigated for the design of novel nanocomposite materials with superior thermoelectrical properties.
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Samvedi, Vikas, i Vikas Tomar. "Role of Interface Thermal Boundary Resistance, Straining, and Morphology in Thermal Conductivity of a Set of Si-Ge Superlattices and Biomimetic Si-Ge Nanocomposites". W ASME 2011 Pacific Rim Technical Conference and Exhibition on Packaging and Integration of Electronic and Photonic Systems. ASMEDC, 2011. http://dx.doi.org/10.1115/ipack2011-52284.

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Nanoscale engineered materials with tailored thermal properties are desirable for applications such as highly efficient thermoelectric, microelectronic and optoelectronic devices. It has been shown earlier that by judiciously varying interface thermal boundary resistance (TBR) thermal conductivity in nanostructures could be controlled. Two types of nanostructures that have gained significant attention owing to the presence of TBR are superlattices and nanocomposites. A systematic comparison of thermal behavior of superlattices and nanocomposites considering their characteristic structural factors such as periodicity and period length for superlattices, and morphology for nanocomposites, under different extents of straining at a range of temperatures remains to be performed. In this presented work, such analyses are performed for a set of Si-Ge superlattices and Si-Ge biomimetic nanocomposites using non-equilibrium molecular dynamics (NEMD) simulations at three different temperatures (400 K, 600 K, and 800 K) and at strain levels varying between −10% and 10%. The analysis of interface TBR contradicts the usual notion that each interface contributes equally to the heat transfer resistance in a layered structure. The dependence of thermal conductivity of superlattice on the direction of heat flow gives it a characteristic somewhat similar to a thermal diode as found in this study. The comparison of thermal behavior of superlattices and nanocomposites indicate that the nanoscale morphology differences between the superlattices and the nanocomposites lead to a striking contrast in the phonon spectral density, interfacial thermal boundary resistance, and thermal conductivity. Both compressive and tensile strains are observed to be important factors in tailoring the thermal conductivity of the analyzed superlattices, whereas have very insignificant influence on the thermal conductivity of the analyzed nanocomposites.
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Raporty organizacyjne na temat "Nanocomposites for thermoelectric applications"

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Shakouri, Ali, Nobby Kobayashi, Zhixi Bian, John Bowers, Art Gossard, Arun Majumdar, Rajeev Ram, Tim Sands, Josh Zide i Lon Bell. Metal-Semiconductor Nanocomposites for High Efficiency Thermoelectric Power Generation. Fort Belvoir, VA: Defense Technical Information Center, grudzień 2013. http://dx.doi.org/10.21236/ada606254.

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Cross, L. E. Nanocomposites for Electronic Applications. Volume 1. Fort Belvoir, VA: Defense Technical Information Center, czerwiec 1993. http://dx.doi.org/10.21236/ada267070.

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Cross, L. E. Nanocomposites for Electronic Applications. Volume 3. Fort Belvoir, VA: Defense Technical Information Center, czerwiec 1993. http://dx.doi.org/10.21236/ada267073.

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Wei, Kung-Hwa. High-Sensitivity Conjugated Polymer/Nanoparticle Nanocomposites for Infrared Sensor Applications. Fort Belvoir, VA: Defense Technical Information Center, marzec 2011. http://dx.doi.org/10.21236/ada538201.

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Stokes, Kevin L., i Charles J. O'Connor. Investigation of Nanophase Materials for Thermoelectric Applications. Fort Belvoir, VA: Defense Technical Information Center, kwiecień 2004. http://dx.doi.org/10.21236/ada424526.

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Fitzgerald, Eugene A., Merton C. Flemings i Mayank Bulsara. Development of Heterostructure Materials for Thermoelectric Device Applications. Fort Belvoir, VA: Defense Technical Information Center, sierpień 2005. http://dx.doi.org/10.21236/ada455752.

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Pavlicek, Anna, red. Polymer Nanocomposites - Additives, properties, applications, environmental aspects (NanoTrust-Dossier No. 052en – February 2020. Vienna: self, 2022. http://dx.doi.org/10.1553/ita-nt-052en.

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Agarwal, Vivek, Shelton Jacinto i Yanliang Zhang. Thermoelectric Generator Powered Wireless Sensor Node Prototype for Nuclear Applications. Office of Scientific and Technical Information (OSTI), styczeń 2018. http://dx.doi.org/10.2172/1467405.

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Brittain, W. M. Special Applications RTG Technology Program: Thermoelectric module development summary report. Office of Scientific and Technical Information (OSTI), wrzesień 1988. http://dx.doi.org/10.2172/10176632.

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Reyes-Esqueda, Jorge-Alejandro. Linear and Nonlinear Plasmonics from Isotropic and Anisotropic Integrated Nanocomposites for Quantum Information Applications. Fort Belvoir, VA: Defense Technical Information Center, styczeń 2014. http://dx.doi.org/10.21236/ada596457.

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