Gotowe bibliografie tematyczne / Graphene-metal nanostructures

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Gotowa bibliografia na temat „Graphene-metal nanostructures”

Autor: Grafiati

Data publikacji: 6 września 2023

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Artykuły w czasopismach na temat "Graphene-metal nanostructures"

Chatterjee, Aniruddha, i Dharmesh Hansora. "Graphene Based Functional Hybrid Nanostructures: Preparation, Properties and Applications". Materials Science Forum 842 (luty 2016): 53–75. http://dx.doi.org/10.4028/www.scientific.net/msf.842.53.

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The intent of this chapter is to provide a basic overview of recent advances in graphene based hybrid nanostructures including their preparation, properties and potential applications in various field. The development of graphene based functional materials, has shown their tremendous interest in areas of science, engineering and technology. These materials include graphene supported inorganic nanomaterials and films, graphene-metal decorated nanostructures, Core/shell structures of nanocarbon-graphene and graphene doped polymer hybrid nanocomposites etc. They have been prepared by various methods like chemical vapor deposition of hydrocarbon on metal surface, liquid phase exfoliation of graphite, chemical reduction of GO, silver mirror reaction, catalysis, in-situ hydroxylation and sono sol-gel route, respectively. The attractive properties of graphene and their derivatives filled with metal nanoparticles (e.g. Au, Ag, Pd, Pt, Ni, and Cu) have made them ideal templates. Graphene and their derivatives have also been decorated with various semiconductor nanomaterials (e.g. metal oxides and dioxides, metal sulfides). These metal decorated graphene nanostructures can be useful as functional hybrid nanomaterials in electronics, optics, and energy based products like solar cells, fuel cells, Li-ion batteries and supercapacitors, ion exchange and molecular adsorption.

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Wiwatowski, Kamil, Paweł Podlas, Magdalena Twardowska i Sebastian Maćkowski. "Fluorescence Studies of the Interplay between Metal-Enhanced Fluorescence and Graphene-Induced Quenching". Materials 11, nr 10 (9.10.2018): 1916. http://dx.doi.org/10.3390/ma11101916.

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Fluorescence microscopy and spectroscopy were applied for studying the optical properties of a hybrid nanostructure, in which we combine plasmon-induced metal enhanced fluorescence with energy transfer to epitaxial graphene. Covering the layer of silver islands with a monolayer graphene, while turning on the efficient energy transfer from emitters, only moderately affects the enhancement of fluorescence attributed to the plasmon resonance in metallic nanostructures—as evidenced by the analysis of fluorescence decays. The results show that it is feasible to combine the properties of graphene with metal-enhanced fluorescence. The importance of the layer thickness of the emitters is also pointed out.

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Fesenko, Olean, Andrii Yaremkevich, Wolfgang Steinmaurer, Battulga Munkhbat, Calin Hrelescu i Francesco Bonaccorso. "Metal-graphene nanostructures for SEIRA spectroscopy". Molecular Crystals and Liquid Crystals 701, nr 1 (12.04.2020): 106–17. http://dx.doi.org/10.1080/15421406.2020.1741125.

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Bai, Xiaoyan, Tianqi Cao, Tianyu Xia, Chenxiao Wu, Menglin Feng, Xinru Li, Ziqing Mei i in. "MoS2/NiSe2/rGO Multiple-Interfaced Sandwich-like Nanostructures as Efficient Electrocatalysts for Overall Water Splitting". Nanomaterials 13, nr 4 (16.02.2023): 752. http://dx.doi.org/10.3390/nano13040752.

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Constructing a heterogeneous interface using different components is one of the effective measures to achieve the bifunctionality of nanocatalysts, while synergistic interactions between multiple interfaces can further optimize the performance of single-interface nanocatalysts. The non-precious metal nanocatalysts MoS2/NiSe2/reduced graphene oxide (rGO) bilayer sandwich-like nanostructure with multiple well-defined interfaces is prepared by a simple hydrothermal method. MoS2 and rGO are layered nanostructures with clear boundaries, and the NiSe2 nanoparticles with uniform size are sandwiched between both layered nanostructures. This multiple-interfaced sandwich-like nanostructure is prominent in catalytic water splitting with low overpotential for oxygen evolution reaction (OER) and hydrogen evolution reaction (HER) and almost no degradation in performance after a 20 h long-term reaction. In order to simulate the actual overall water splitting process, the prepared nanostructures are assembled into MoS2/NiSe2/rGO||MoS2/NiSe2/rGO modified two-electrode system, whose overpotential is only 1.52 mV, even exceeded that of noble metal nanocatalyst (Pt/C||RuO2~1.63 mV). This work provides a feasible idea for constructing multi-interface bifunctional electrocatalysts using nanoparticle-doped bilayer-like nanostructures.

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Ghopry, Samar Ali, Seyed M. Sadeghi, Cindy L. Berrie i Judy Z. Wu. "MoS2 Nanodonuts for High-Sensitivity Surface-Enhanced Raman Spectroscopy". Biosensors 11, nr 12 (25.11.2021): 477. http://dx.doi.org/10.3390/bios11120477.

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Nanohybrids of graphene and two-dimensional (2D) layered transition metal dichalcogenides (TMD) nanostructures can provide a promising substrate for extraordinary surface-enhanced Raman spectroscopy (SERS) due to the combined electromagnetic enhancement on TMD nanostructures via localized surface plasmonic resonance (LSPR) and chemical enhancement on graphene. In these nanohybrid SERS substrates, the LSPR on TMD nanostructures is affected by the TMD morphology. Herein, we report the first successful growth of MoS2 nanodonuts (N-donuts) on graphene using a vapor transport process on graphene. Using Rhodamine 6G (R6G) as a probe, SERS spectra were compared on MoS2 N-donuts/graphene nanohybrids substrates. A remarkably high R6G SERS sensitivity up to 2 × 10−12 M has been obtained, which can be attributed to the more robust LSPR effect than in other TMD nanostructures such as nanodiscs as suggested by the finite-difference time-domain simulation. This result demonstrates that non-metallic TMD/graphene nanohybrids substrates can have SERS sensitivity up to one order of magnitude higher than that reported on the plasmonic metal nanostructures/2D materials SERS substrates, providing a promising scheme for high-sensitivity, low-cost applications for biosensing.

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Tamm, Aile, Tauno Kahro, Helle-Mai Piirsoo i Taivo Jõgiaas. "Atomic-Layer-Deposition-Made Very Thin Layer of Al2O3, Improves the Young’s Modulus of Graphene". Applied Sciences 12, nr 5 (27.02.2022): 2491. http://dx.doi.org/10.3390/app12052491.

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Nanostructures with graphene make them highly promising for nanoelectronics, memristor devices, nanosensors and electrodes for energy storage. In some devices the mechanical properties of graphene are important. Therefore, nanoindentation has been used to measure the mechanical properties of polycrystalline graphene in a nanostructure containing metal oxide and graphene. In this study the graphene was transferred, prior to the deposition of the metal oxide overlayers, to the Si/SiO2 substrate were SiO2 thickness was 300 nm. The atomic layer deposition (ALD) process for making a very thin film of Al2O3 (thickness comparable with graphene) was applied to improve the elasticity of graphene. For the alumina film the Al(CH3)3 and H2O were used as the precursors. According to the micro-Raman analysis, after the Al2O3 deposition process, the G-and 2D-bands of graphene slightly broadened but the overall quality did not change (D-band was mostly absent). The chosen process did not decrease the graphene quality and the improvement in elastic modulus is significant. In case the load was 10 mN, the Young’s modulus of Si/SiO2/Graphene nanostructure was 96 GPa and after 5 ALD cycles of Al2O3 on graphene (Si/SiO2/Graphene/Al2O3) it increased up to 125 GPa. Our work highlights the correlation between nanoindentation and defects appearance in graphene.

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Xia, Kangwei, Wei-Yi Chiang, Cesar Javier Lockhart de la Rosa, Yasuhiko Fujita, Shuichi Toyouchi, Haifeng Yuan, Jia Su i in. "Photo-induced electrodeposition of metallic nanostructures on graphene". Nanoscale 12, nr 20 (2020): 11063–69. http://dx.doi.org/10.1039/d0nr00934b.

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A practical and low-cost optical technique is demonstrated to direct deposit metal nano-patterned structures without the need for a sacrificial resist on graphene. The technique relies on the laser-induced reduction of metal ions on a graphene film.

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Chen, Hsin-Yu, Yi-Hong Xiao, Lin-Jiun Chen, Chi-Ang Tseng i Chuan-Pei Lee. "Low-Dimensional Nanostructures for Electrochemical Energy Applications". Physics 2, nr 3 (11.09.2020): 481–502. http://dx.doi.org/10.3390/physics2030027.

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Materials with different nanostructures can have diverse physical properties, and they exhibit unusual properties as compared to their bulk counterparts. Therefore, the structural control of desired nanomaterials is intensely attractive to many scientific applications. In this brief review, we mainly focus on reviewing our recent reports based on the materials of graphene and the transition metal chalcogenide, which have various low-dimensional nanostructures, in relation to the use of electrocatalysts in electrochemical energy applications; moreover, related literatures were also partially selected for discussion. In addition, future aspects of the nanostructure design related to the further enhancement of the performance of pertinent electrochemical energy devices will also be mentioned.

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Marath Santhosh, Neelakandan Marath, Ana Dias, Janez Zavašnik, Elena Stefanova Tatarova i Uros Cvelbar. "Single-Step Atmospheric Pressure Plasma-Enabled Designing of Graphene Hybrids: A Green Approach for Energy Storage Materials". ECS Meeting Abstracts MA2022-02, nr 19 (9.10.2022): 891. http://dx.doi.org/10.1149/ma2022-0219891mtgabs.

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Considering the increasing demand for advanced energy materials for future energy-related applications, designing promising materials at a low cost is critical. Given the importance of structural design and morphological features of the designed material in energy applications, fabricating materials at the nanoscale with controlled morphology and orientation is important. Recently 2-dimensional graphene-based materials have emerged as a potential candidate for next-generation energy applications. However, conventional chemical and physical routes for producing high-quality graphene have certain limitations either due to the cost or the processing time. Therefore, an advanced technique for designing and processing graphene structures at the atomic scale is needed to produce high-quality materials. In this regard, safe and clean environmentally-friendly plasma-enabled techniques have been explored as a potential method to tailor different structures at the nanoscale. As a synthesis approach, plasma assembles the nanostructures from gaseous into a solid form. Therefore, this paper suggests the advantages of atmospheric pressure plasma-enabled approaches to design and engineer graphene-based materials at the nanoscale with high structural quality and controllability with hybrid morphologies. Here, a novel, single-step microwave plasma-enabled approach at atmospheric conditions used to design hybrid high-quality graphene-based nanostructures is presented. The plasma techniques allow the synthesis of high-quality N-graphene (nitrogen-doped graphene) metal-based nanostructures at one of the fastest production rates of ∼ 19 mg/min. The graphene production is carried out in the high energy density zone of microwave plasma, and the growth of N-graphene sheets occurred in the afterglow region. Spraying metal particle-containing gases into this zone allows the formation of hybrid N-graphene structures anchored with metal oxide/sulphide nanoparticles. Structural and morphological analysis of these hybrids using different microscopic and spectroscopic techniques confirmed the high structural quality and distribution of metal-based nanostructures on N-graphene sheets. This fast and facile approach is expected to provide a significant impact on designing high-quality graphene hybrids, which can be used for sustainable energy storage applications.

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Khan, Mohammad Ehtisham, Mohammad Mansoob Khan i Moo Hwan Cho. "Recent progress of metal–graphene nanostructures in photocatalysis". Nanoscale 10, nr 20 (2018): 9427–40. http://dx.doi.org/10.1039/c8nr03500h.

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This review summarizes the recent and advanced progress for the easy fabrication and design of metal–graphene-based nanostructures as photocatalysts using a range of approaches, including green and biogenic approaches.

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Rozprawy doktorskie na temat "Graphene-metal nanostructures"

Khan, Hafeez Ullah. "Decoration of graphene sheets with metal and metal oxide nanostructures by low-pressure plasma deposition". Doctoral thesis, University of Trento, 2017. http://eprints-phd.biblio.unitn.it/2038/1/Hafeez_Ullah_Thesis.pdf.

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This thesis was dedicated to decorate graphene sheets with metal and metal oxide nanostructures by RF sputtering technique. Two main objectives were focused in this thesis. 1) To decorate graphene sheets uniformly with metal and metal oxide nanostructure without agglomeration. 2) To explore different kinds of application of decorated graphene sheets with metal and metal oxide nanostructures In the first step, we presented the experimental study results about Nb2O5 deposition onto graphite nanoplatelets (GNPs) by the variation of the deposition process parameters. The structural, chemical and electronic properties of the decorated GNPs with Nb2O5 layers were studied. It was found that with deposition of Nb2O5 layers onto GNPs, tensile strain was developed into the planes of the GNPs. The induced tensile strain in and between the planes of GNPs increased with raising the amount of the Nb2O5 concentration. TEM images shows that GNPs decorated with around 5 to10 nm uniform layer of Nb2O5 at 100 W on their surface were successfully fabricated. From the XPS analysis it was confirmed that, by increasing Nb2O5 layer thickness on the GNPs surface with rising RF power values binding energy downshift in C 1s peak suggests a p-type doping of GNPs due to charge transfer at the interface as a consequence of the higher work function difference between the Nb2O5 (4.70 eV) and GNPs (4.33 eV). In the second step, the interface between the graphene sheets and Nb2O5 nanoparticles were studied. It was established that the structural defects were pronounced with increasing amounts of the Nb2O5 concentration. XPS measurement on graphene/Nb2O5 suggests p-type doping of graphene due to charge transfer at the interface as a consequence of the high work function of Nb2O5. The strong p-doping effect was also confirmed by Raman analysis where the positions of the G and 2D peaks of graphene gradually upshifted upon increasing the Nb2O5 concentration. The uniform distribution of decorated Nb2O5 nanoparticles onto graphene was confirmed from TEM analysis. The ferromagnetic behavior was observed for the undecorated graphene and decorated graphene with Nb2O5 nanoparticles. The ferromagnetic behavior of graphene was enhanced with decoration of the Nb2O5 nanoparticles. In the third step, the effect of the Mg concentration on the structural, chemical and morphological properties of the graphene was described. Well dispersed Mg nanoparticles were decorated onto graphene sheets. It was found that from the XRD results, different sizes of the crystalline Mg nanoparticles were obtained onto graphene sheets with variation of the process parameters.. Raman spectra indicated that G and 2D bands of the graphene were shifted to higher wavenumber with deposition of Mg nanoparticles. The well dispersed and small size of Mg nanoparticles in the range of (8-12 nm) onto graphene sheets was decorated by using a high powder vibration frequency. No agglomeration of the sputtered particles was observed with high powder vibration frequency. This observation was confirmed by TEM micrographs. XPS analysis revealed that the decorated Mg nanoparticles onto graphene were oxidized due to exposure to the atmosphere. The well dispersed decorated Mg nanoparticles onto graphene sheets were studied for the hydrogen absorption and desorption at two different temperatures 330 oC and 360 oC at 2 and 8 bars pressure. The hydrogen up taking capacity for the decorated graphene sheets with Mg nanoparticles was 3 wt. % in whole composite. However, the up taking hydrogen storage capacity of the only Mg nanoparticles was 6.6 wt. %. In the last step, the interaction of the graphene sheets with TiO2 nanoparticles was studied. The XRD results indicated that the lattice of the graphene sheets was distorted with increasing amount of the TiO2 concentration. The particle nature of the deposited TiO2 was confirmed by TEM examination and also the TEM analysis shows that TiO2 nanoparticles were uniformly distributed onto graphene sheets. The Raman analysis showed that the G and 2D bands of graphene were shifted to higher wavenumber with increasing TiO2 concentration onto graphene sheet confirming the p doped graphene with TiO2 nanoparticles. The XPS analysis further confirmed the p doping of graphene upon the deposition of the TiO2 nanoparticles. The binding energy downshift the C 1s core level of was observed after charge transfer from graphene to TiO2 nanoparticles due to the larger work function of TiO2 relatively to that of graphene. It was observed that decorated graphene sheets with TiO2 nanoparticles shows reasonably catalytic activity.

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Summerfield, Alex. "Studies of self-assembled metal-organic nanostructures and the MBE growth of graphene". Thesis, University of Nottingham, 2016. http://eprints.nottingham.ac.uk/33067/.

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This thesis discusses the formation of metal-organic and organic structures grown on surfaces using bottom-up self-assembly techniques. Three systems are investigated primarily using scanning probe microscopy techniques. The growth of metal-organic frameworks (MOFs) on functionalised surfaces is investigated using high resolution atomic force microscopy (AFM). The earliest stages of MOF crystal nucleation are imaged using a layer-by-layer (LBL) growth technique and the ability to track the growth of individual nanocrystallites throughout the LBL process is demonstrated. This LBL method has been suggested as a route to fabricating epitaxially grown, oriented thin-films of MOFs. However, results from these studies indicate that, rather than a uniform crystalline layer, the morphology is that of a preferentially oriented but laterally polycrystalline film and the growth rates of the individual nanocrystallites exceed those expected for a LBL growth mode. This has significant implications for the fabrication of novel devices that incorporate MOFs due to the presence of domain boundaries and defects. Self-assembled monolayers of light-harvesting porphyrin nanorings are investigated with scanning tunnelling microscopy (STM) and AFM. The nanorings are found to form large supramolecular networks in ambient conditions on graphite and boron nitride surfaces. The size and order of these networks is found to be dependent on the number of porphyrin macrocycles that make up each ring. In addition, simulations of isolated nanorings are also performed using Monte Carlo methods to model the distortion previously been observed for isolated nanorings on gold surfaces. These are discussed in the context of spectroscopic measurements which suggest that both size dependent and thermally induced distortion affects the lifetime and delocalisation of excited states in these molecules. Graphene is grown on hexagonal boron nitride surfaces using high-temperature molecular beam epitaxy. Large domains of monolayer graphene are successfully grown and are investigated using AFM and Raman spectroscopy. These domains are found to exhibit hexagonal moiré patterns on the graphene surface which is suggestive of orientational alignment with the underlying boron nitride substrate. Regions with high period and distorted moiré patterns are also observed which suggest that the graphene is under tensile strain which is attributed to the high growth temperatures used. The strain is found to significantly affect the Raman spectrum of graphene and a relationship between the strain and the shifting of Raman spectral peaks is determined. Successful attempts are also made to modify the strain in the graphene monolayer using an AFM tip which is observed to relax when defects are introduced in a controlled manner to the graphene monolayer. These results represent new approaches to the introduction and control of strain in graphene which may be useful for the fabrication of high-performance graphene devices.

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Jean, Fabien. "Growth and structure of graphene on metal and growth of organized nanostructures on top". Thesis, Université Grenoble Alpes (ComUE), 2015. http://www.theses.fr/2015GREAY097/document.

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Le graphène, une monocouche de graphite, est composé d'atomes de carbone avec une structure en nid d'abeilles. Ses propriétés exceptionnelles ont attiré un intérêt mondial, dont le Prix Nobel de Physique en 2010. Le graphène épitaxié sur métal à rapidement été identifié comme un moyen de production de graphène de haute qualité de taille métrique, et est le sujet d'intenses activités de recherche en sciences de surface pour caractériser ses propriétés. En outre, ces études concernent aussi des systèmes plus complexes avec pour base le graphène, par exemple les réseaux ordonnés de nanoparticules à sa surface. Tout cela a mené à l'étude de la croissance, de la structure et des défauts du graphène épitaxié avec un grande variété de techniques expériementales, tel que la microscopie par effet tunnel, spectroscopie par photo-émission résolue en angle ou encore la microscopie électronique à basse énergie. Ce travail de recherche se concentre sur le graphène obtenu par croissance sur la surface (111) d'un monocristal d'iridium dans des conditions d'ultra vide et étudié avec plusieurs techniques de mesure par diffraction (diffraction de surface des rayons X, diffraction des rayons X en incidence rasante, réflectivité des rayons X et diffraction des électrons à haute énergie en réflexion). Ces expériences ont été faites au synchrotron européen ESRF à Grenoble, en France. La première partie de cette étude a été de déterminer la structure du graphène à l'échelle atomique. Le système montre une tendance à la commensurabilité, mais sa structure précise dépend fortement des conditions de préparation et de la température appliqué au système. En outre, en combinant des techniques de diffraction à haute résolution, une caractérisation précise de la structure, qui fait débat dans la littérature, est dévoilée. Le système étudié présente aussi une surperstructure, typique du graphène épitaxié, nommé moiré pour ses similarités avec l'effet optique du même nom. Celle-ci est utilisée comme gabarit pour faire croître des nanoparticules monodisperses à la surface en réseau auto-organisé. Durant cette étude, trois types de nanoparticules ont été examinés, des particules de platine de deux tailles différentes et des particules composées de platine et de cobalt. Ces systèmes hybrides présentent un fort degré d'organisation, partiellement hérité de la superstructure du moiré. Les nanoparticules forme une interaction forte avec leur support et elles subissent des contraintes de surface causées par leurs petites tailles. Par ailleurs, les nanoparticules de platine-cobalt, dont la croissance est en deux étapes, gardent une structure en couche et non une structure d'alliage métallique
Graphene, a monolayer of graphite, is composed of carbon atoms arranged in a honeycomb lattice. Its exceptional properties have attracted a worldwide interest, including the Novel Prize in Physics in 2010. Epitaxial graphene on a metal was rapidly identified as an efficient method for large-area production of high quality graphene, and also was the matter of intense activities exploiting surface science approaches to address the various properties of graphene and of advanced systems based on graphene, for instance ordered lattice of metal nanoparticles on graphene. This resulted in the study of growth, structure and defects of epitaxial graphene on a wide variety of substrates with various techniques such as scanning tunneling microscopy, angle-resolved photoemission spectroscopy or low-energy electron microscopy. This work focuses on graphene grown on the (111) surface of iridium in ultra-high vacuum conditions and studied with several diffraction techniques (surface X-ray diffraction, grazing incidence X-ray diffraction, X-ray reflectivity, and reflection-high energy electron diffraction). These experiments were performed at the European Synchrotron Radiation Facility in Grenoble, France. The first step in our study was to determine the structure of graphene at the atomic scale. The system was found to have a tendency to commensurability, but that the precise structure depends on temperature and on preparation conditions. Moreover, with the combination of high resolution diffraction techniques, a precise characterization about the debated structure of graphene perpendicular to the surface was unveiled. The system, exhibits a superstructure, typical of epitaxial graphene, called a moiré, as an equivalent of the moiré effect in optics. This is used as a template to grown nanoparticles on top of the system to achieve the self-organisation of monodisperse nanoparticles. In this study, three type of nanoparticles were investigated, two different size of pure platinum ones and bimetallic ones, platinum and cobalt. These hybrid systems show very high degree of order, partly inherited by the superstructure lattice. The nanoparticles were found to strongly bond to their support, experience substantial surface strain related to their small size, and that bimetallic ones grown in a sequential manner retain a chemically layered structure

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Mei, Jun. "Optimization of two-dimensional nanostructures for rechargeable batteries". Thesis, Queensland University of Technology, 2019. https://eprints.qut.edu.au/135045/1/Jun%20Mei%20Thesis.pdf.

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This research aims to explore the optimization strategies of two-dimensional (2D) nanostructures for high-performance rechargeable batteries. Three effective strategies, including 2D-based phase engineering, component engineering and van der Waals (vdW) heterostructures, were proposed for improving electrochemical properties of 2D nanomaterials. These effective strategies will offer good references for researchers to develop practical next-generation rechargeable batteries using the emerging 2D nanomaterials.

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Docherty, Callum James. "Terahertz spectroscopy of graphene and other two-dimensional materials". Thesis, University of Oxford, 2014. http://ora.ox.ac.uk/objects/uuid:98c03952-dc3f-442b-bbc0-d8397645cc1b.

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In this thesis, two-dimensional materials such as graphene are tested for their suitability for opto-electronic applications using terahertz time domain spectroscopy (THz-TDS). This ultrafast all-optical technique can probe the response of novel materials to photoexcitation, and yield information about the dynamics of the material systems. Graphene grown by chemical vapour deposition (CVD) is studied using optical-pump THz-probe time domain spectroscopy in a variety of gaseous environments in Chapter 4. The photoconductivity response of graphene grown by CVD is found to vary dramatically depending on which atmospheric gases are present. Adsorption of these gases can open a local bandgap in the material, allowing stimulated emission of THz radiation across the gap. Semiconducting equivalents to graphene, molybdenum disulphide (MoS₂) and tungsten diselenide (WSe₂), grown by CVD, are investigated in Chapter 5. These members of the transition metal dichalcogenide family show sub-picosecond responses to photoexcitation, suggesting promise for use in high-speed THz devices. In Chapter 6, an alternative production route to CVD is studied. Liquid-phase exfoliation offers fast, easy production of few-layer materials. THz spectroscopy reveals that the dynamics of these materials after photoexcitation are remarkably similar to those in CVD-grown materials, offering the potential of cheaper materials for future devices. Finally in Chapter 7, it is shown that carbon nanotubes can be used to make ultrafast THz devices. Unaligned, semiconducting single walled carbon nanotubes can be photoexcited to produce an ultrafast, dynamic THz polariser. The work in this thesis demonstrates the potential for these novel materials in future opto-electronic applications. THz spectroscopy is shown to be an important tool for the characterisation of new materials, providing information that can be used to understand the dynamics of materials, and improve production methods.

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Piloto, Carlo. "Carbon nanomaterials for room temperature gas sensing". Thesis, Queensland University of Technology, 2016. https://eprints.qut.edu.au/97743/1/Carlo_Piloto_Thesis_Redacted.pdf.

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The aim of this research is to develop high performance gas sensors with low power consumption and high portability. This was achieved by synthesizing carbon nanomaterials decorated with alkali-metal dopants and metal oxides, and by optimizing ultrathin layer of carbon nanobutes coupled to a new deposition technique. These materials demonstrated excellent sensitivity at room temperature to both nitrogen dioxide and ammonia, down to ppm level, providing a new pathway to realise room temperature gas sensors. Our fabrication methods are highly scalable and do not involve the use of expensive equipment which makes them excellent candidates for mass production.

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BAKRY, AYYOB MOHAMMED A. "Applications of Chemically Modified Nitrogen Doped Carbon, Zirconium Phosphate, Metal Organic Frameworks, and Functionalized Graphene Oxide Nanostructured Adsorbents in Water Treatment". VCU Scholars Compass, 2019. https://scholarscompass.vcu.edu/etd/6105.

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Water contaminations by many pollutants, especially heavy metals such as Pb(II), Hg(II), Cu(II), Cd(II), and Cr(VI) pose many public health and environmental concerns as reported in the list of hazardous substances compiled by the US Environmental Protection Agency due to their high toxicity, refractory degradation, and ease of entering food chain. Adsorption by chelating resins is proven to be the most effective method for the extraction of metal ions from polluted and wastewater. However, traditional absorbents such as activated carbon, activated alumina, clay, zeolite, etc., show limited adsorption abilities for these heavy metal ions. The major goal of this thesis is to develop eﬃcient and cost-eﬀective adsorbents for the extraction of heavy metals from wastewater. This dissertation will focus on the development of four chemically modified high surface area adsorbents with accessible chelating sites for capturing and retaining toxic metal ions from polluted water. The first adsorbent, Nitrogen Doped Carboxylated Activated Carbon (ND-CAC), is prepared by a polymerization reaction between melamine and formaldehyde to form the melamine formaldehyde resin (MF-R) followed by carbonization at 800 oC under nitrogen atmosphere to form nitrogen doped carbon (ND-C), and finally oxidation to form the ND-CAC adsorbent. The ND-CAC adsorbent shows high adsorption capacities of 750.5, 250.5, 98.2 mg/g for the extraction of Pb(II), Hg(II), and Cr(VI), respectively from aqueous solutions with a high selectivity to Pb(II). The second adsorbent, Melamine Zirconium Phosphate (M-ZrP) is prepared by a precipitation reaction between Melamine Phosphate (MP) and ZrCl4 in an aqueous solution. The M-ZrP adsorbent is used for the removal of Pb(II), Hg(II), and Cd(II) with maximum adsorption capacities of 680.4, 119.0, and 60.0 mg/g, respectively with a high selectivity to Pb(II). The third adsorbent is chemically functionalized metal organic framework (UIO-66-IT) was prepared by post-synthetic modification using the chelating ligand 2-Imino-4-Thioburit. The adsorbent was used to extract Hg(II) and (HPO4)- ions from aqueous solutions and the results revealed exceptionally high adsorption capacities toward mercury and phosphate ions of 700 and 160 mg/g, placing it among the top functionalized MOF known for the high capacity of Hg(II) removal from aqueous solutions. The fourth adsorbent, Melamine Thiourea Partially Reduced Graphene Oxide (MT-PRGO) prepared by the amidation reaction between chemically modified graphene oxide and melamine thiourea, is used for the effective extraction of Hg(II), Co(II) and Cu(II) from polluted water. The MT-PRGO adsorbent shows exceptional selectivity for the extraction of Hg(II) with a capacity of 651 mg/g, placing it among the top of carbon-based materials known for the high capacity of Hg(II) removal from aqueous solutions. Desorption studies demonstrate that the new adsorbents ND-CAC, M-ZrP, UIO-66-IT, and MT-PRGO are easily regenerated with the desorption of the heavy metal ions Hg(II), Pb(II), Cd(II), and Cr(VI) reaching 99 % - 100 % recovery from their maximum sorption capacities using different eluents. Moreover, all prepared adsorbents showed tremendous abilities to clean contaminated water from toxic heavy metals at trace concentrations. That prove the ability of using them at water contamination level when the concentration of heavy metals is very low. The new adsorbents ND-CAC, M-ZrP, UIO-66-IT, and MT-PRGO are proposed as top performing remediation adsorbents for the extraction of the heavy metals Pb(II), Hg(II), Cd(II), Cr(VI), and (HPO4)- from waste and polluted water.

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Li, Yanguang. "Nanostructured Materials for Energy Applications". The Ohio State University, 2010. http://rave.ohiolink.edu/etdc/view?acc_num=osu1275610758.

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Bhardwaj, Shivani. "Plasmonic properties of graphene-metal nanostructures for broad spectral tailoring". Thesis, 2018. http://eprint.iitd.ac.in:80//handle/2074/7946.

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Das, Barun. "Investigations Of Graphene, Noble Metal Nanoparticles And Related Nanomaterials". Thesis, 2011. http://hdl.handle.net/2005/2432.

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The thesis consists of four parts of which part 1 presents a brief overview of nanomaterials. Parts 2, 3 and 4 contain results of investigations of graphene, nanofilms of noble metal nanoparticles and ZnO nanostructures respectively. Investigations of graphene are described in Part 2 which consists of six chapters. In Chapter 2.1, changes in the electronic structure and properties of graphene induced by molecular charge-transfer have been discussed. Chapter 2.2 deals with the results of a study of the interaction of metal and metal oxide nanoparticles with graphene. Electrical and dielectric properties of graphene-polymer composites are presented in Chapter 2.3. Chapter 2.4 presents photo-thermal effects observed in laser-induced chemical transformations in graphene and other nanocarbons system. Chapter 2.5 describes the mechanical properties of polymer matrix composites reinforced by fewlayer graphene investigated by nano-indentation. The extraordinary synergy found in the mechanical properties of polymer matrix composites reinforced with two nanocarbons of different dimensionalities constitute the subject matter of Chapter 2.6. Investigations of noble metal nanoparticles have been described in Part 3. In Chapter 3.1, ferromagnetism exhibited by nanoparticles of noble metals is discussed in detail while Chapter 3.2 deals with surface-enhanced Raman scattering (SERS) of molecules adsorbed on nanocrystalline Au and Ag films formed at the organic–aqueous interface. Factors affecting laser-excited photoluminescence from ZnO nanostructures are examined in great detail in Part 4.

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Książki na temat "Graphene-metal nanostructures"

Materials for Solar Cell Technologies I. Materials Research Forum LLC, 2021. http://dx.doi.org/10.21741/9781644901090.

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The book reviews recent research and new trends in the area of solar cell materials. Topics include fabrication methods, solar cell design, energy efficiency and commercialization of next-generation materials. Special focus is placed on graphene and carbon nanomaterials, graphene in dye-sensitized solar cells, perovskite solar cells and organic photovoltaic cells, as well as on transparent conducting electrode (TCE) materials, hollow nanostructured photoelectrodes, monocrystalline silicon solar cells (MSSC) and BHJ organic solar cells. Also discussed is the use of graphene, sulfides, and metal nanoparticle-based absorber materials.

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Pinto, Susana, Paula Marques, Carla Vilela, Ricardo João Borges Pinto, Armando Silvestre i Carmen Sofia da Rocha Freire Barros. Polysaccharide Based Hybrid Materials: Metals and Metal Oxides, Graphene and Carbon Nanotubes. Springer, 2018.

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Części książek na temat "Graphene-metal nanostructures"

Mo, Runwei, i Yuan An. "3D Graphene for Metal–Air Batteries". W Carbon Nanostructures, 233–47. Cham: Springer Nature Switzerland, 2023. http://dx.doi.org/10.1007/978-3-031-36249-1_13.

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Koh, Jin Kwei, i Chin Wei Lai. "3D Graphene for Metal-Ion Batteries". W Carbon Nanostructures, 207–31. Cham: Springer Nature Switzerland, 2023. http://dx.doi.org/10.1007/978-3-031-36249-1_12.

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Sinha, Ankita, Dhanjai, Jiping Chen i Rajeev Jain. "Functionalized Graphene-Metal Nanoparticles Nanohybrids as Electrochemical Sensors". W Carbon Nanostructures, 49–62. Singapore: Springer Singapore, 2019. http://dx.doi.org/10.1007/978-981-32-9057-0_2.

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Karuppasamy, Lakshmanan, Lakshmanan Gurusamy, Gang-Juan Lee i Jerry J. Wu. "Synthesis of Metal/Metal Oxide Supported Reduced Graphene Oxide (RGO) for the Applications of Electrocatalysis and Supercapacitors". W Carbon Nanostructures, 1–48. Singapore: Springer Singapore, 2019. http://dx.doi.org/10.1007/978-981-32-9057-0_1.

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Nayak, Arpan Kumar, i Akshaya Kumar Swain. "Facile Room Temperature Synthesis of Reduced Graphene Oxide as Efficient Metal-Free Electrocatalyst for Oxygen Reduction Reaction". W Carbon Nanostructures, 259–71. Cham: Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-030-30207-8_10.

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Rani, Sanju, Manoj Kumar, Yogesh Singh, Rahul Kumar i V. N. Singh. "Metal Oxide/CNT/Graphene Nanostructures for Chemiresistive Gas Sensors". W Chemical Methods for Processing Nanomaterials, 163–94. First edition. | Boca Raton : CRC Press, Taylor & Francis Group, 2021.: CRC Press, 2020. http://dx.doi.org/10.1201/9780429023187-10.

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Liu, Minmin, i Wei Chen. "Graphene-Supported Metal Nanostructures with Controllable Size and Shape as Advanced Electrocatalysts for Fuel Cells". W Graphene-based Energy Devices, 307–38. Weinheim, Germany: Wiley-VCH Verlag GmbH & Co. KGaA, 2015. http://dx.doi.org/10.1002/9783527690312.ch11.

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Jaleh, Babak, Samira Naghdi, Nima Shahbazi i Mahmoud Nasrollahzadeh. "Fabrication and Application of Graphene Oxide-based Metal and Metal Oxide Nanocomposites". W Advances in Nanostructured Composites, 25–52. Boca Raton, FL : CRC Press, Taylor & Francis Group, [2018] | Series: Advances in nanostructured composites ; volume 2 | “A science publishers book.»: CRC Press, 2019. http://dx.doi.org/10.1201/9780429021718-2.

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Ali, Imran, Zeid A. ALOthman i Abdulrahman Alwarthan. "Removal of Metal Ions Using Graphene Based Adsorbents". W Nanostructured Materials for Treating Aquatic Pollution, 1–33. Cham: Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-030-33745-2_1.

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Dey, Abhijit. "Recent Advances in Graphene Metal Oxide Based Nanocomposite for Energy Harvesting/Thermoelectric Application". W Advances in Nanostructured Composites, 442–81. Boca ERaton, FL : CRC Press, Taylor & Francis Group, 2018. | Series: A science publishers book | Series: Advances in nanostructured composites ; volume 1: CRC Press, 2019. http://dx.doi.org/10.1201/9781315118406-20.

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Streszczenia konferencji na temat "Graphene-metal nanostructures"

Ghamsari, Behnood G., Anthony Olivieri, Fabio Variola i Pierre Berini. "On-chip nonlinear plasmonics with graphene-metal nanostructures". W 2015 Photonics North. IEEE, 2015. http://dx.doi.org/10.1109/pn.2015.7292474.

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Pierantoni, Luca, Davide Mencarelli i Matteo Stocchi. "Accurate analysis of plasmon propagation in metal and graphene nanostructures". W 2017 IEEE/MTT-S International Microwave Symposium - IMS 2017. IEEE, 2017. http://dx.doi.org/10.1109/mwsym.2017.8058956.

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Pierantoni, Luca, Davide Mencarelli i Matteo Stocchi. "Accurate analysis of plasmon propagation in metal and graphene nanostructures". W 2017 IEEE MTT-S International Microwave Workshop Series on Advanced Materials and Processes for RF and THz Applications (IMWS-AMP). IEEE, 2017. http://dx.doi.org/10.1109/imws-amp.2017.8247410.

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Dong, Yuan, i Jian Lin. "Reactive Molecular Dynamics Simulation of Graphene-Based Nanomaterials Produced by Confined Heating of Polymer". W ASME 2016 5th International Conference on Micro/Nanoscale Heat and Mass Transfer. American Society of Mechanical Engineers, 2016. http://dx.doi.org/10.1115/mnhmt2016-6716.

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The graphene-based nanomaterial has great potential as catalyst and supercapacitors. In this paper we study the pyrolysis of polymers in a nanosecond time scale with the reactive molecular dynamics (MD) simulations using ReaxFF potential. It is found that the confined heating will produce graphene-like nanostructures out of two kinds of polymers: polyimide and polyether ether ketone. The peak pressure achieves above 3GPa with a processing temperature of 3000K. It indicates that the local high temperature and pressure can convert polymer to graphene-based nanomaterials without metal catalyst, which may enable large scale production of high performance electrical devices and microreactors with laser scribing method.

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Tynyshtykbayev, Kurbangali, Chistos Spitas, Konstantinos Kostas i Zinetula Insepov. "GRAPHENE LOW-TEMPERATURE SYNTHESIS ON POROUS SILICON". W International Forum “Microelectronics – 2020”. Joung Scientists Scholarship “Microelectronics – 2020”. XIII International conference «Silicon – 2020». XII young scientists scholarship for silicon nanostructures and devices physics, material science, process and analysis. LLC MAKS Press, 2020. http://dx.doi.org/10.29003/m1551.silicon-2020/40-44.

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The possibility of low-temperature synthesis of graphene on the surface of porous silicon (PS) is associated with the excess surface energies of nc-PS nanocrystallites ; the boundary interface nanocrystallties nc-PS / c-Si monocrystal matrix; the dangling bonds of silicon atoms of nanocrystallites skeleton nc-PS. This opens up new prospects for the development of methods for the low-temperature synthesis of graphene without metal catalysts for the decomposition of carbon precursors, including using the ALD method.

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Iakushev, D. A., i Servando Lopez-Aguayo. "Narrow-Pass-Band Amplification of THz Radiation by Dielectric-Metal Nanostructures with Optically Active Graphene-Based Inclusions". W Novel Optical Materials and Applications. Washington, D.C.: OSA, 2017. http://dx.doi.org/10.1364/noma.2017.nom4c.3.

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Norris, Pamela M., Justin L. Smoyer, John C. Duda i Patrick E. Hopkins. "Prediction and Measurement of Thermal Transport Across Interfaces Between Isotropic Solids and Graphitic Materials". W ASME 2010 8th International Conference on Nanochannels, Microchannels, and Minichannels collocated with 3rd Joint US-European Fluids Engineering Summer Meeting. ASMEDC, 2010. http://dx.doi.org/10.1115/fedsm-icnmm2010-30171.

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Due to the high intrinsic thermal conductivity of carbon allotropes, there have been many attempts to incorporate such structures into existing thermal abatement technologies. In particular, carbon nanotubes (CNTs) and graphitic materials (i.e., graphite and graphene flakes or stacks) have garnered much interest due to the combination of both their thermal and mechanical properties. However, the introduction of these carbon-based nanostructures into thermal abatement technologies greatly increases the number of interfaces per unit length within the resulting composite systems. Consequently, thermal transport in these systems is governed as much by the interfaces between the constituent materials as it is by the materials themselves. This paper reports the behavior of phononic thermal transport across interfaces between isotropic thin films and graphite substrates. Elastic and inelastic diffusive transport models are formulated to aid in the prediction of conductance at a metal-graphite interface. The temperature dependence of the thermal conductance at Au-graphite interfaces is measured via transient thermoreflectance from 78 to 400 K. It is found that different substrate surface preparations prior to thin film deposition have a significant effect on the conductance of the interface between film and substrate.

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Junjun Cheng, Jinfeng Zhu, Shuang Yan, Lirong Zhang i Qinghuo Liu. "A novel electro-optic modulator with metal/dielectric/graphene nanostructure: Simulation of isotropic and anisotropic graphene". W 2016 Progress in Electromagnetic Research Symposium (PIERS). IEEE, 2016. http://dx.doi.org/10.1109/piers.2016.7735311.

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