Relevant bibliographies by topics / Nanostructured architectures

Academic literature on the topic 'Nanostructured architectures'

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Published: 10 December 2022
Last updated: 28 January 2023

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Journal articles on the topic "Nanostructured architectures"

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LU, PAI, and DONGFENG XUE. "EMULSION-ASSISTED SYNTHESIS OF NICKEL SULFIDE HIERARCHICAL ARCHITECTURES." Modern Physics Letters B 23, no. 31n32 (December 30, 2009): 3843–49. http://dx.doi.org/10.1142/s0217984909021909.

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We herein demonstrated the preparation of nickel sulfide hierarchical architectures via an emulsion-assisted route in hydrothermal system. Scanning electron microscope images of the products at different reaction stages indicated that the construction of the nanostructured hierarchical nickel sulfide was accomplished through oriented attachment accompanied by an encapsulation procedure, and the as-obtained products exhibited uniform architectures assembled by various primary units (e.g. nanorods, nanosheets). In addition, the effect of different surfactants on the shape of nickel sulfide nanostructures was further studied. The results indicated that the hierarchical architectures can only be achieved with the assistance of anionic surfactant (e.g. sodium dodecyl sulfate). These as-prepared novel hierarchical nanostructures may be used in various areas, including industrial catalysis, and energy storage etc.
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Cho, Seong J., Se Yeong Seok, Jin Young Kim, Geunbae Lim, and Hoon Lim. "One-Step Fabrication of Hierarchically Structured Silicon Surfaces and Modification of Their Morphologies Using Sacrificial Layers." Journal of Nanomaterials 2013 (2013): 1–8. http://dx.doi.org/10.1155/2013/289256.

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Fabrication of one-dimensional nanostructures is a key issue for optical devices, fluidic devices, and solar cells because of their unique functionalities such as antireflection and superhydrophobicity. Here, we report a novel one-step process to fabricate patternable hierarchical structures consisting of microstructures and one-dimensional nanostructures using a sacrificial layer. The layer plays a role as not only a micromask for producing microstructures but also as a nanomask for nanostructures according to the etching time. Using this method, we fabricated patterned hierarchical structures, with the ability to control the shape and density of the nanostructure. The various architectures provided unique functionalities. For example, our sacrificial-layer etching method allowed nanostructures denser than what would be attainable with conventional processes to form. The dense nanostructure resulted in a very low reflectance of the silicon surface (less than 1%). The nanostructured surface and hierarchically structured surface also exhibited excellent antiwetting properties, with a high contact angle (>165°) and low sliding angle (<1°). We believe that our fabrication approach will provide new insight into functional surfaces, such as those used for antiwetting and antireflection surface applications.
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LIU, FEI, and DONGFENG XUE. "CHEMICAL DESIGN OF COMPLEX NANOSTRUCTURED METAL OXIDES IN SOLUTION." International Journal of Nanoscience 08, no. 06 (December 2009): 571–88. http://dx.doi.org/10.1142/s0219581x09006407.

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Nanostructured materials with controlled architectures are desirable for many applications, among which, metal oxides are especially important in optics, electronics, biology, catalysis, and energy conversions. Various chemical routes have been widely investigated for the synthesis of nanostructured metal oxide particles and films. More recently, deliberately designed chemical strategies have been used to produce particles and films composed of more complex crystal structures. In this paper, we discuss some recent progresses in the design of complex nanostructures through chemical routes, emphasize particularly on metal oxides. We first review some basic concepts involved in the fabrication of complex nanostructures, including crystal nucleation and growth, shape controlling and ripening process. We then describe more recent work on the use of different methods to synthesize a wide range of complex nanostructures, including hierarchical structures, heterostructures, as well as oriented nanowires and nanotubes. Such purposely built materials are designed, and engineered to match the physical, chemical, and structural requirements of their applications.
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Luo, Shiting, Limei Xu, Jinshan Li, Wenjing Yang, Minli Liu, and Lin Ma. "Facile Synthesis of MoS2 Hierarchical Nanostructures as Electrodes for Capacitor with Enhanced Pseudocapacitive Property." Nano 15, no. 01 (January 2020): 2050011. http://dx.doi.org/10.1142/s1793292020500113.

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In this work, the 3D porous hierarchical MoS2 nanostructures were prepared via a simple hydrothermal deposition method only utilizing titanium (Ti) mesh as a substrate. The as-synthesized uniform MoS2 flower-like nanostructures were assembled by nanosheets composed of several stacking layers. The curved and rough surface of cylindrical Ti wire was beneficial to assembly of MoS2 nanosheets into hierarchical architectures. Moreover, the electrochemical performance of the as-prepared MoS2 nanostructured electrodes for capacitors was also investigated. The structural advantages lead to a remarkably improved pseudocapacitive property including high capacitance and durable cycling ability.
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Dylla, Anthony G., Graeme Henkelman, and Keith J. Stevenson. "Lithium Insertion in Nanostructured TiO2(B) Architectures." Accounts of Chemical Research 46, no. 5 (February 20, 2013): 1104–12. http://dx.doi.org/10.1021/ar300176y.

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Ilyas, Nasir, Dongyang Li, Yuhao Song, Hao Zhong, Yadong Jiang, and Wei Li. "Low-Dimensional Materials and State-of-the-Art Architectures for Infrared Photodetection." Sensors 18, no. 12 (November 27, 2018): 4163. http://dx.doi.org/10.3390/s18124163.

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Infrared photodetectors are gaining remarkable interest due to their widespread civil and military applications. Low-dimensional materials such as quantum dots, nanowires, and two-dimensional nanolayers are extensively employed for detecting ultraviolet to infrared lights. Moreover, in conjunction with plasmonic nanostructures and plasmonic waveguides, they exhibit appealing performance for practical applications, including sub-wavelength photon confinement, high response time, and functionalities. In this review, we have discussed recent advances and challenges in the prospective infrared photodetectors fabricated by low-dimensional nanostructured materials. In general, this review systematically summarizes the state-of-the-art device architectures, major developments, and future trends in infrared photodetection.
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dos Santos-Gómez, Lucía, Javier Zamudio-García, José M. Porras-Vázquez, Enrique R. Losilla, and David Marrero-López. "Nanostructured BaCo0.4Fe0.4Zr0.1Y0.1O3-δ Cathodes with Different Microstructural Architectures." Nanomaterials 10, no. 6 (May 30, 2020): 1055. http://dx.doi.org/10.3390/nano10061055.

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Lowering the operating temperature of solid oxide fuel cells (SOFCs) is crucial to make this technology commercially viable. In this context, the electrode efficiency at low temperatures could be greatly enhanced by microstructural design at the nanoscale. This work describes alternative microstructural approaches to improve the electrochemical efficiency of the BaCo0.4Fe0.4Zr0.1Y0.1O3-δ (BCFZY) cathode. Different electrodes architectures are prepared in a single step by a cost-effective and scalable spray-pyrolysis deposition method. The microstructure and electrochemical efficiency are compared with those fabricated from ceramic powders and screen-printing technique. A complete structural, morphological and electrochemical characterization of the electrodes is carried out. Reduced values of area specific resistance are achieved for the nanostructured cathodes, i.e., 0.067 Ω·cm2 at 600 °C, compared to 0.520 Ω·cm2 for the same cathode obtained by screen-printing. An anode supported cell with nanostructured BCFZY cathode generates a peak power density of 1 W·cm−2 at 600 °C.
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Mohnani, Stefan, Anna Llanes-Pallas, and Davide Bonifazi. "Mastering nanostructured materials through H-bonding recognitions at interfaces." Pure and Applied Chemistry 82, no. 4 (March 20, 2010): 917–29. http://dx.doi.org/10.1351/pac-con-10-01-06.

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The controlled engineering of functional architectures composed of π-systems with unusual opto-electronic properties is currently being investigated intensively from both fundamental research and technological application viewpoints. In particular, the exploitation of the supramolecular approach for the facile construction of multidimensional architectures, featuring cavities capable of hosting functional molecules, could be used in several applications, such as nanomedicine, molecular-based memory storage devices, and sensors. This paper highlights our recent strategies to use hydrogen-bonding interactions to prepare nanostructured functional architectures via the self-assembly of organic molecular modules studied at different interfaces.
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Zhuge, Fuwei, Zhi Zheng, Peng Luo, Liang Lv, Yu Huang, Huiqiao Li, and Tianyou Zhai. "Nanostructured Materials and Architectures for Advanced Infrared Photodetection." Advanced Materials Technologies 2, no. 8 (May 30, 2017): 1700005. http://dx.doi.org/10.1002/admt.201700005.

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Di Maria, Francesca, Mattia Zangoli, and Giovanna Barbarella. "Supramolecular Thiophene-Based Materials: A Few Examples of the Interplay between Synthesis, Optoelectronic Properties and Applications." Organic Materials 03, no. 02 (April 2021): 321–36. http://dx.doi.org/10.1055/s-0041-1730934.

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Supramolecular nanostructured thiophene based materials with optoelectronic functions are of wide current interest and are playing a crucial role in different fields of nanoscience and nanotechnology. This short review gives a concise report of some particularly interesting examples from our own work concerning thiophene-based supramolecular architectures at multiple length scales, their function and application in devices. We start with some general considerations on the great chemical diversity of thiophene derivatives and their supramolecular architectures. Then we focus on how the supramolecular organization of specific thiophene derivatives may generate nanostructures that enable new functions and applications in devices. For each example, we report the synthesis of the corresponding thiophene derivatives.1. Introduction2. Supramolecular Organization may Impart New Functions to the System3. Supramolecular and Optoelectronic Properties of Oligothiophene-S,S-dioxides4. Colloidal Nanoparticles formed by Self-Assembly of Thiophene-Based Polymers5. Conclusions and Outlook
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Dissertations / Theses on the topic "Nanostructured architectures"

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Jean, Joel Ph D. Massachusetts Institute of Technology. "Nanostructured architectures for colloidal quantum dot solar cells." Thesis, Massachusetts Institute of Technology, 2013. http://hdl.handle.net/1721.1/82187.

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Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 2013.
This electronic version was submitted by the student author. The certified thesis is available in the Institute Archives and Special Collections.
Cataloged from student-submitted PDF version of thesis.
Includes bibliographical references (p. 73-79).
This thesis introduces a novel ordered bulk heterojunction architecture for colloidal quantum dot (QD) solar cells. Quantum dots are solution-processed nanocrystals whose tunable bandgap energies make them a promising active-layer candidate for next-generation optoelectronic devices, including solar cells and light-emitting diodes. Despite rapid advances in performance, however, modern QD solar cells remain limited by a fundamental trade-o between light absorption and photocarrier collection due to poor electronic transport. Vertically aligned arrays of ZnO nanowires can decouple absorption and collection: The nanowires penetrate into the QD film and serve as highly-conductive channels for extracting photogenerated electrons from deep within the film. After optimizing the nanowire growth and device fabrication processes, we nd that incorporating nanowires boosts the photocurrent and the eciency of planar QD photovoltaic devices by 50% and 35%, respectively. The demonstrated AM1.5G power conversion eciency of 4.9% is among the highest ever reported for a ZnO-based QD solar cell. We further show that graphene can serve as a viable alternative to tin-doped indium oxide (ITO) as a transparent conductive electrode for thin-film optoelectronics. We grow ZnO nanowires on graphene and fabricate prototype graphene-based ordered bulk heterojunction QD devices with photovoltaic performance approaching that of ITO-based solar cells. Our work shows that nanostructured architectures can substantially improve QD solar cell performance, and that a simple, low-temperature, bottom-up solution growth process can produce nanowire alignment and device performance matching that of top-down synthetic processes, with the added advantage of compatibility with a variety of rigid and flexible substrates. The 1-D nanostructure design principles we propose and apply here can be generalized to a broad range of optoelectronic device applications. This study of scalable bottom-up processing of ZnO nanowire-based QD solar cells suggests that 1-D nanostructures may be the key to enhancing the eciency and hence the economic viability of quantum dot photovoltaics.
by Joel Jean.
S.M.
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Bayle, Maxime. "Architectures plasmoniques enterrées : élaboration, propriétés optiques et applications." Toulouse 3, 2014. http://thesesups.ups-tlse.fr/2664/.

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Dans notre travail, nous présentons une étude d'architectures plasmoniques à base d'assemblées planes de nanoparticules (NPs) d'argent, enterrées à quelques nanomètres sous la surface d'une matrice diélectrique. L'analyse structurale des matériaux, notamment par microscopie électronique en transmission, a été menée pour déterminer le rôle des différents paramètres de la technique d'élaboration, l'implantation ionique à basse énergie, sur l'organisation à trois dimensions des NPs, dans des films de dioxyde ou de nitrure de silicium sur substrat de silicium. Afin de contrôler de manière systématique ces paramètres, nous avons étudié les réponses optiques élastique et inélastique des hétérostructures. La réponse optique élastique a été obtenue grâce à des mesures de réflectance optique, puis confrontée à des simulations numériques que nous avons développées afin de déterminer la taille moyenne des NPs et la quantité d'argent implantée. L'étude de la topographie du champ électrique a ainsi permis de tirer profit à la fois de la résonnance plasmonique et de l'amplification optique dans nos systèmes multicouches antireflet. La réponse inélastique a quant à elle été étudiée grâce à la spectrométrie Raman sur une large gamme de fréquence. Les modes collectifs de vibration (dits de Lamb) des NPs ont été analysés à basse fréquence, et à plus haute fréquence, nous avons extrait la densité d'états des modes de vibration (VDOS). Associée à des simulations atomistiques, celle-ci nous a donné des informations originales sur la dynamique vibrationnelle à l'échelle atomique et les propriétés thermodynamiques de NPs d'argent enterrées (mais également de NPs d'or déposées). Enfin, nous montrons plusieurs exemples d'applications des assemblées de NPs dans des dispositifs hybrides comme l'exploitation des couplages entre ces NPs et des dépôts (notamment de graphène) réalisés sur nos substrats. En particulier, ceux-ci peuvent être exploités pour la spectrométrie exaltée de surface (effet SERS). Puis nous avons conçu, grâce aux techniques de microélectronique, des dispositifs de plasmo-électronique exploitant les propriétés de photoconductance de ces assemblées de NPs, déposées ou enterrées
In our work, we present the study of plasmonic architectures made of a plane of nanoparticules (NPs) embedded at the vicinity of a dielectric matrix free surface, by low energy ion beam synthesis. Materials structural analysis, especially by transmission electron microscopy, have been carried out to determine the impact of the elaboration process parameters on the three dimensional organization of the NPs, in silicon dioxide or nitride layers grown on silicon substrates. To systematically check these parameters, we studied the elastic and inelastic optical responses of the heterostructures. The elastic response has been obtained by measuring the reflectance of the samples, and confronted to numerical modelling we developed, to determine the mean size of the NPs and the implanted silver amount. The study of the electric field topography allowed us to take benefit from both plasmonic resonance and optical amplification in antireflective layers. The inelastic response has been studied using Raman spectroscopy over a wide frequency range: vibrational collective modes (Lamb modes) of the NPs have been studied at low frequency, while at higher frequency, we have extracted the vibrational density of states (VDOS). Combined with atomistic simulations, the VDOS gave us original information on the vibrational dynamics and the thermodynamic properties of buried silver NPs (and deposited gold NPs). Finally, we present some applications of the assemblies of NPs in hybrid devices, such as the use of coupling between these NPs and deposited substances (e. G. Graphene) on our substrates. In particular, it can be used for surface enhanced Raman spectroscopy (SERS). Then using techniques from microelectronics, we designed plasmo-electronic devices exploiting photoconductance properties of these buried or deposited NPs assemblies
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Schulze, Carsten [Verfasser], Manfred [Akademischer Betreuer] Albrecht, Manfred [Gutachter] Albrecht, and Sibylle [Gutachter] Gemming. "Magnetization Reversal in Film-Nanostructure Architectures  : Magnetization Reversal in Film-Nanostructure Architectures / Carsten Schulze ; Gutachter: Manfred Albrecht, Sibylle Gemming ; Betreuer: Manfred Albrecht." Chemnitz : Universitätsbibliothek Chemnitz, 2014. http://d-nb.info/1214302173/34.

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Schulze, Carsten. "Magnetization Reversal in Film-Nanostructure Architectures ." Doctoral thesis, Universitätsbibliothek Chemnitz, 2014. http://nbn-resolving.de/urn:nbn:de:bsz:ch1-qucosa-142720.

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The concept of percolated perpendicular media (PPM) for magnetic data storage is expected to surpass the areal storage density of 1 Tbit in -², which is regarded as the fundamental limit of conventional granular CoCrPt:oxide based recording media. PPM consist of a continuous ferromagnetic thin film with densely distributed defects acting as pinning sites for magnetic domain walls. In this study, practical realizations of PPM were fabricated by the deposition of [Co/Pt]8 multilayers with perpendicular magnetic anisotropy onto nanoperforated templates with various perforation diameters and periods. The structural defects given by the templates serve as pinning sites for the magnetic domain walls within the [Co/Pt]8 multilayers. Magnetometry at both the integral and the local level was employed to investigate the influence of the template on the magnetization reversal and the domain wall pinning. It was found, that magnetic domains can be pinned at the ultimate limit, between three adjacent pinning sites. The coercivity and the depinning field, which both are a measure for the strength of the magnetic domain wall pinning, were found to increase with increasing perforation diameter. The size of magnetic domains within the magnetic film appeared not to depend solely on the diameter of the nanoperforations or on the period of the template, but on the ration between diameter and period. By means of micromagnetic simulations it was found, that the presence of ferromagnetic material within the pinning site given supports the pinning of magnetic domain walls, compared to a pinning site that is solely given by a hole in the magnetic thin film. Investigation of the evolution of the magnetization in magnetic fields smaller than the coercive field revealed, that the energy barrier against thermally induced magnetization reversal is sufficiently large to provide long-term (> 10 years) stability of an arbitrary magnetization state. This could also be qualitatively supported by micromagnetic simulations. Static read/write tests with conventional hard disk recording heads revealed the possibility of imprinting bit patterns into the PPM under study. The minimum bit pitch that could be read back thereby depended on the period of the nanoperforated template.
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Nguyen, Van Tang. "Nanostructured soft-hard magnetic materials with controlled architecture." Thesis, Le Mans, 2018. http://www.theses.fr/2018LEMA1007.

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Parmi les aimants sans terres raresactuellement étudiés, τ-MnAl ferromagnétique est uncandidat à haut potentiel, car il possède despropriétés magnétiques intrinsèques prometteuses.Dans cette thèse, Mn(Fe)AlC a été synthétisé parbroyage mécanique. Les effets du carbone sur lamicrostructure et les propriétés magnétiques ont étéétudiés. Les résultats montrent qu’une pureté élevéede τ-MnAl(C) pouvait être obtenue avec un dopage à2% en atomes de carbone, montrant clairement l’effetstabilisant du carbone. L’alliage Mn54.2Al43.8C2possède les meilleures propriétés magnétiques :aimantation à 2T M2T = 414 kAm-1, aimantationrémanente Mr = 237 kAm-1, coercivité HC = 229 kAm-1et |BH|max = 11,2 kJm-3. HC augmente inversementproportionnellement avec la taille des cristallites de laphase τ et proportionnellement à la teneur en C. Descalculs ab initio confirment l’effet stabilisant etindiquent les positions interstitielles préférentielles ducarbone dans la maille quadratique de la phase τ-MnAl.Les alliages Mn51-xFexAl47C2 (x = 0,25, 0,5, 1, 2, 4, 6)ont également été synthétisés par broyagemécanique, montrant une pureté élevée de la phaseτ jusqu'à un taux de substitution de 2% du Mn par duFe. L'ajout de Fe dans MnAl(C) réduit l'aimantationet TC, mais augmente légèrement la valeur de HC. Laspectrométrie 57Fe Mössbauer à 300K a été utiliséepour sonder l'environnement local dans ε-, τ-, β- etγ2-MnFeAl(C). γ2-, ε- et β-MnFeAl(C) présentent unestructure hyperfine quadripolaire alors que τ-Mn50.5Fe0.5Al47C2 montre une structutr hyperfinemagnétique assez complexe. Une expérience despectrométrie Mössbauer effectuée à bassetempérature (10K) et sous champ magnétique (8T)montre un ordre ferromagnétique local non colinéairedes moments magnétiques de Fer par rapport à ladirection du champ appliqué. Le champ hyperfin del’alliage MnFeAl calculé par Wien2k confirme lespropriétés magnétiques et les résultats despectrométrie Mössbauer
Among currently investigated rare-earth-free magnets, ferromagnetic τ-MnAl is a highly potential candidate as having promising intrinsic magnetic properties. In my thesis, Mn(Fe)AlC was synthesized by mechanical alloying method. Effects of carbon on microstructure and magnetic properties were systematically investigated. It was found that high purity of τ-MnAl(C) could be obtained at 2 at.% C doping, showing clearly stabilizing effect of carbon. Mn54.2Al43.8C2 has the best magnetic properties: magnetization at 2T M2T = 414 kAm-1, remanent magnetization Mr = 237 kAm-1, coercivity HC = 229 kAm-1, and |BH|max = 11.2 kJm-3. HC increased inversely with the crystallite size of τ phase and proportionally with C content. Moreover, first principle calculation showed both stabilizing effect and preferable interstitial positions of carbon in tetragonal τ-MnAl. Mn51-xFexAl47C2 (x= 0.25, 0.5, 1, 2, 4, 6) alloys were also synthesized by mechanical alloying method, showing high purity of τ phase up to 2 at.% Fe doping. Adding of Fe on MnAl(C) reduced both magnetization and TC but likely increased slightly HC. 57Fe Mössbauer spectrometry at 300K was used to probe local enviroment in ε-, τ-, β-, and γ2-MnFeAl(C). In which, γ2-, ε-, and β-MnFeAl(C) exhibited a quadrupolar structure while τ -Mn50.5Fe0.5Al47C2 spectrum showed a rather complex magnetic hyperfine splitting. The interaction between Fe and Mn examined by in-field Mössbauer measurement at 10 K and 8 T showed a non-collinear magnetic structure between Fe and Mn with different canting angles at different sites. Hyperfine field of MnFeAl alloy calculated by Win2k supported both magetic properties and Mossbauer results
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Yip, Chi Kin. "A catalytic architecture composed of titanium silicalite-1 and nanostructured support for oxime synthesis /." View abstract or full-text, 2009. http://library.ust.hk/cgi/db/thesis.pl?CBME%202009%20YIP.

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DeSantis, Christopher John. "Manipulating the architecture of bimetallic nanostructures and their plasmonic properties." Thesis, Indiana University, 2015. http://pqdtopen.proquest.com/#viewpdf?dispub=3665584.

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There has been much interest in colloidal noble metal nanoparticles due to their fascinating plasmonic and catalytic properties. These properties make noble metal nanoparticles potentially useful for applications such as targeted drug delivery agents and hydrogen storage devices. Historically, shape-controlled noble metal nanoparticles have been predominantly monometallic. Recent synthetic advances provide access to bimetallic noble metal nanoparticles wherein their inherent multifunctionality and ability to fine tune or expand their surface chemistry and light scattering properties of metal nanoparticles make them popular candidates for many applications. Even so, there are currently few synthetic strategies to rationally design shape-controlled bimetallic nanocrystals; for this reason, few architectures are accessible. For example, the "seed-mediated method" is a popular means of achieving monodisperse shape-controlled bimetallic nanocrystals. In this process, small metal seeds are used as platforms for additional metal addition, allowing for conformal core@shell nanostructures. However, this method has only been applied to single metal core/single metal shell structures; therefore, the surface compositions and architectures achievable are limited. This thesis expands upon the seed-mediated method by coupling it with co-reduction. In short, two metal precursors are simultaneously reduced to deposit metal onto pre-formed seeds in hopes that the interplay between two metal species facilitates bimetallic shell nanocrystals. Au/Pd was used as a test system due to favorable reduction potentials of metal precursors and good lattice match between Au and Pd. Alloyed shelled Au@Au/Pd nanocrystals were achieved using this "seed-mediated co-reduction" approach. Symmetric eight-branched Au/Pd nanocrystals (octopods) are also prepared using this method. This thesis investigates many synthetic parameters that determine the shape outcome in Au/Pd nanocrystals during seed-mediated co-reduction. Plasmonic, catalytic, and assembly properties are also investigated in relation to nanocrystal shape and architecture. This work provides a foundation for the rational design of architecturally defined bimetallic nanostructures.

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Wei, Diming. "The beauty of DNA architecture : the design and applications in DNA nanotechnology /." View abstract or full-text, 2009. http://library.ust.hk/cgi/db/thesis.pl?CBME%202009%20WEI.

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Belchi, Raphaëlle. "Architectures à base de nanostructures de carbone et TiO₂pour le photovoltaïque." Thesis, Université Paris-Saclay (ComUE), 2019. http://www.theses.fr/2019SACLS329/document.

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Le photovoltaïque est une énergie renouvelable pouvant aider à lutter contre le réchauffement climatique et l’épuisement des ressources fossiles utilisées pour la production d’énergie. La filière émergente à base de matériaux pérovskites (photovoltaïque de 3ème génération) est très prometteuse car elle utilise des matériaux abondants et faciles à mettre en œuvre (technologie bas-coût) et a montré de plus des rendements record compétitifs en peu de temps. Il reste cependant des verrous technologiques à lever afin de pouvoir développer cette technologie à grande échelle. L’un deux consiste à améliorer la couche de TiO₂ qui transporte les électrons et dont les défauts limitent les performances et la durée de vie des cellules photovoltaïques pérovskites. Ce travail propose l’utilisation de matériaux à base de nanostructures de carbone et de TiO₂ pour améliorer le transport et la collecte des électrons au sein de ces cellules photovoltaïques et ainsi améliorer leur rendement. Pour cela, la pyrolyse laser, technique singulière de production continue de nanoparticules, a été adaptée pour l’élaboration de nanocomposites TiO₂/graphène aux propriétés contrôlées. Ces matériaux ont été caractérisés puis intégrés aux cellules photovoltaïques pérovskites qui ont démontré une meilleure efficacité en présence de graphène. Par ailleurs, ce travail présente une architecture innovante à base de nanotubes de carbone alignés verticalement, en vue d’une application pour la collecte des électrons photo-générés des cellules photovoltaïques pérovskites. Les matériaux carbonés présentent donc de fortes potentialités pour l’optoélectronique, et plus particulièrement pour le photovoltaïque de 3ème génération
Photovoltaic is a promising renewable energy to tackle global warming and the depletion of fossil resources. The emerging field of perovskite solar cells (3rd generation photovoltaic) is very attractive because it uses abundant and easy-processing materials (low-cost technology) and provides competitive efficiencies.Still, efforts remain to be performed to develop this technology, especially concerning the improvement of efficient and reliable charge transporting electrodes. Titanium dioxide layer, commonly used for electron extraction, presents defects that limit the performance and lifetime of the perovskite solar cells.This work proposes the use of materials based on TiO₂ and carbon nanostructures to improve the electron transport and collection within the solar cells, in order to enhance the power conversion efficiency. The singular technique of laser pyrolysis, which is a continuous process of nanoparticles synthesis, was adapted to produce TiO₂/graphene nanocomposites with well-controlled properties. These materials have been characterized and integrated into perovskite solar cells that demonstrate an improved efficiency in presence of graphene.Besides, this work presents an innovating architecture based on vertically aligned carbon nanotubes for the electron collection of a perovskite solar cell. We show then the strong potential of carbon materials for optoelectronic, especially 3rd generation photovoltaic
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Kong, David Sun 1979. "Nanostructure fabrication by electron and ion beam patterning of nanoparticles." Thesis, Massachusetts Institute of Technology, 2004. http://hdl.handle.net/1721.1/28346.

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Thesis (S.M.)--Massachusetts Institute of Technology, School of Architecture and Planning, Program in Media Arts and Sciences, 2004.
Includes bibliographical references (leaves 82-83).
Two modes of energetic beam-mediated fabrication have been investigated, namely focused ion beam (FIB) direct-writing of nanoparticles, and a technique for electrostatically patterning ionized inorganic nanoparticles, termed nanoxerography. A FIB has been used to directly pattern thin films of organometallic Ag-precursors down to a resolution of 100 nm. The sensitivity of the resist to 30 keV Ga+ ions was measured to be approximately 5 C/cm2. Using this technique arbitrary structures were fabricated in two and three dimensions with resistivity on the order of 1x10 4 Q-cm and 1x1 0-5 Q-cm for single- and multi-layer structures, respectively. A new unit of merit for characterizing direct-write processes, termed resistivity-dose (Q-jC/cm), has been introduced. A Nanocluster Source capable of generating a beam of charged, inorganic nanoparticles has been characterized. The relationship between power supplied to the magnetron of the source and the size of deposited clusters has been plotted. Techniques for utilizing such clusters to develop latent electrified images patterned by an electron beam (EB) have been proposed. The charge-storing characteristics of a variety of substrates such as mylar and polyimide were studied by developing EB-patterned charge images with toner particles.
David Sun Kong.
S.M.
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Books on the topic "Nanostructured architectures"

1

V, Diudea Mircea, ed. Nanostructures: Novel architecture. Hauppauge, N.Y: Nova Science Publishers, 2005.

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2

Champion, Yannik, and Hans-Jörg Fecht, eds. Nano-Architectured and Nanostructured Materials. Weinheim, FRG: Wiley-VCH Verlag GmbH & Co. KGaA, 2004. http://dx.doi.org/10.1002/3527606017.

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1939-, Vögtle F., and Astruc D, eds. Dendrimers II: Architecture, nanostructure and supramolecular chemistry. Berlin: Springer, 2000.

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4

Y, Champion, and Fecht Hans-Jörg, eds. Nano-architectured and nanostructured materials: Fabrication, control and properties. Weinheim: Wiley-VCH, 2004.

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5

Y, Champion, and Fecht Hans-Jörg, eds. Nano-architectured and nanostructured materials: Fabrication, control and properties. Weinheim: Wiley-VCH, 2004.

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6

Yves, Bréchet, Embury J. D, and Onck Patrick R, eds. Architectured multifunctional materials: Symposium held April 14-16, San Francisco, California, U.S.A. Warrendale, Pa: Materials Research Society, 2009.

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7

Marius, Kölbel, and Peters Sascha, eds. Nano materials in architecture, interior architecture, and design. Basel: Birkhäuser, 2008.

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8

Chattopadhyay, Surojit. Biomimetic Architectures by Plasma Processing: Fabrication and Applications. Pan Stanford Publishing, 2014.

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9

Biomimetic Architectures by Plasma Processing: Fabrication and Applications. Taylor & Francis Group, 2014.

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Ginzburg, Madlen. Polyferrocenylsilane architectures and precursors to magnetic ceramics: Multidimensional shapes, patterns, films, and nanostructured composites. 2003, 2003.

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Book chapters on the topic "Nanostructured architectures"

1

Schmidt-Mende, Lukas. "Nanostructured Hybrid Solar Cells." In Functional Supramolecular Architectures, 801–26. Weinheim, Germany: WILEY-VCH Verlag & Co. KGaA, 2014. http://dx.doi.org/10.1002/9783527689897.ch26.

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Kamegawa, Takashi, and Hiromi Yamashita. "Photocatalytic Properties of TiO2-Loaded Porous Silica with Hierarchical Macroporous and Mesoporous Architectures." In Nanostructured Photocatalysts, 229–40. Cham: Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-26079-2_13.

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Chavis, Michelle A., Evan L. Schwartz, and Christopher K. Ober. "Block Copolymer Nanostructured Thin Films for Advanced Patterning." In Complex Macromolecular Architectures, 763–90. Singapore: John Wiley & Sons (Asia) Pte Ltd, 2011. http://dx.doi.org/10.1002/9780470825150.ch25.

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Iqbal, Zafar. "Structure, Properties and Applications of Nanostructured Carbon Architectures." In Nanostructured Carbon for Advanced Applications, 309–29. Dordrecht: Springer Netherlands, 2001. http://dx.doi.org/10.1007/978-94-010-0858-7_16.

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Amar-Yuli, Idit, Abraham Aserin, and Nissim Garti. "Synthesis and Alignment of Nanostructured Materials Using Liquid Crystals." In Self-Assembled Supramolecular Architectures, 193–218. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2012. http://dx.doi.org/10.1002/9781118336632.ch7.

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Beckhaus, R. "Titanium-Based Molecular Architectures Formed by Self-Assembled Reactions." In Self-Organized Morphology in Nanostructured Materials, 17–45. Berlin, Heidelberg: Springer Berlin Heidelberg, 2008. http://dx.doi.org/10.1007/978-3-540-72675-3_2.

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Grande, Daniel, Estelle Renard, Julien Babinot, Julien Ramier, and Valérie Langlois. "Harnessing Biopolyesters in the Design of Functional and Nanostructured Architectures." In ACS Symposium Series, 187–99. Washington, DC: American Chemical Society, 2012. http://dx.doi.org/10.1021/bk-2012-1114.ch012.

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Bourgogne, C., I. Bury, L. Gehringer, A. Zelcer, F. Cukiernik, E. Terazzi, B. Donnio, and D. Guillon. "Molecular Dynamics Simulations of Liquid-Crystalline Dendritic Architectures." In Advances in the Atomic-Scale Modeling of Nanosystems and Nanostructured Materials, 99–122. Berlin, Heidelberg: Springer Berlin Heidelberg, 2009. http://dx.doi.org/10.1007/978-3-642-04650-6_4.

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9

Baryshev, Gennady, Yuri Bozhko, Igor Yudin, Aleksandr Tsyganov, and Anna Kainova. "Design of a Transcranial Magnetic Stimulation System with the Implementation of Nanostructured Composites." In Brain-Inspired Cognitive Architectures for Artificial Intelligence: BICA*AI 2020, 24–31. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-65596-9_4.

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Hu, Michael Z., and Matthew R. Sturgeon. "Architectured Nanomembranes." In Nanostructure Science and Technology, 443–65. Cham: Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-59662-4_15.

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Conference papers on the topic "Nanostructured architectures"

1

Boltovets, Praskovia M., Andriy A. Savchenko, and Boris A. Snopok. "Nanostructured interfacial architectures for detection of biospecific interactions." In International Congress on Optics and Optoelectronics, edited by Francesco Baldini, Jiri Homola, Robert A. Lieberman, and Miroslav Miler. SPIE, 2007. http://dx.doi.org/10.1117/12.722851.

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Dipalo, M., F. Tantussi, V. Caprettini, A. Jacassi, V. Shalabaeva, A. Cerea, S. Perotto, and F. De Angelis. "Mimicking and interfacing neuro-biological architectures with nanostructured materials." In 2016 10th International Congress on Advanced Electromagnetic Materials in Microwaves and Optics (METAMATERIALS). IEEE, 2016. http://dx.doi.org/10.1109/metamaterials.2016.7746449.

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Schuster, Patrick, Christine Thanner, Enrique Lopez, and Andrea Kneidinger. "The benefits of inkjet coating for nanostructured AR waveguide fabrication." In Optical Architectures for Displays and Sensing in Augmented, Virtual, and Mixed Reality (AR, VR, MR) IV, edited by Bernard C. Kress and Christophe Peroz. SPIE, 2023. http://dx.doi.org/10.1117/12.2650133.

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Ben-Ettouil, F., A. Denoirjean, A. Grimaud, G. Montavon, and P. Fauchais. "Sub-Micrometer-Sized Y-PSZ Thermal Barrier Coatings Manufactured by Suspension Plasma Spraying: Process, Structure and Some Functional Properties." In ITSC2009, edited by B. R. Marple, M. M. Hyland, Y. C. Lau, C. J. Li, R. S. Lima, and G. Montavon. ASM International, 2009. http://dx.doi.org/10.31399/asm.cp.itsc2009p0193.

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Abstract Suspension plasma spraying facilitates the production of thick coatings structured at the submicron or even nanometer scale. Due to the large volume fraction of internal interfaces, nanostructured coatings tend to be superior to their microstructured counterparts. Suspension plasma sprayed oxide ceramics, for example, have higher coefficients of thermal expansion, lower thermal diffusivity and hysteresis, higher hardness and toughness, and better wear resistance. In this work, Y-PSZ thermal barrier coatings are manufactured by means of SPS using two commercial submicron powders with different particle size distributions. By varying spray parameters, several coating architectures and thicknesses were achieved. The coatings were subjected to a series of thermal and isothermal shocks in order to assess the effect of particle size distribution, layer thickness, and substrate roughness on thermomechanical behavior.
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Darut, G., S. Valette, G. Montavon, H. Ageorges, A. Denoirjean, P. Fauchais, E. Klyatskina, F. Segova, and M. D. Salvador. "Comparison of Al2O3 and Al2O3-TiO2 Coatings Manufactured by Aqueous and Alcoholic Suspension Plasma Spraying." In ITSC2010, edited by B. R. Marple, A. Agarwal, M. M. Hyland, Y. C. Lau, C. J. Li, R. S. Lima, and G. Montavon. DVS Media GmbH, 2010. http://dx.doi.org/10.31399/asm.cp.itsc2010p0197.

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Abstract Alumina-titania plasma spray coatings are widely used for their tribological performances. The combination of these two ceramics in a particular mix percentage permits to manufacture coatings with better wear resistance in comparison to those made of pure alumina. Suspension plasma spraying permit to manufacture sub-micrometer structure coatings very fine structure thanks to precursors which have an initial size of 10 to 300 nm. The use of a liquid feedstock, aqueous or alcoholic, allows the use of nanometer particles directly without the need to agglomerate them to obtain conventional nanostructured micrometer-sized powders. This study aims at studying Al2O3 and Al2O3-TiO2 coatings made from aqueous and alcoholic suspensions produced by suspension plasma spraying. Microstructures and phase evolutions are considered. Manufactured coatings present different architectures depending of operating parameters and feedstock particle sizes; the lower the particle diameter, the thinner the microstructure. Phases composition are discussed and compared to conventional micrometer-sized structure Al2O3 and Al2O3-TiO2 coatings.
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Karpov, Eduard G., and Ievgen Nedrygailov. "Nonadiabatic Chemical to Electrical Energy Conversion in Planar Schottky Nanostructures." In ASME 2010 International Mechanical Engineering Congress and Exposition. ASMEDC, 2010. http://dx.doi.org/10.1115/imece2010-40634.

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Nonadiabatic energy dissipation by electron subsystem of nanostructured solids unveil interesting opportunities for the solid-state energy conversion and sensor applications. We found that planar Pd/n-SiC, Pt/n-GaP and Pd/n-GaP Schottky structures with nanometer thickness metallization demonstrates a nonadiabatic channel for the conversion into electricity the energy of a catalytic hydrogen-to-water oxidation process on the metal layer surface. The observed abovethermal current greatly complements the usual thermionic emission current, and its magnitude is linearly proportional to the rate of formation and desorption of product water molecules from the nanostructure surface. The possibilities and advantages of utilizing the nonadiabatic functionality in a novel class of chemical-to-electrical energy conversion devices are discussed. The technology has a potential for a very high volumetric energy density due to the intrinsically planar device architecture.
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Wagenknecht, Hans-Achim. "Functionalized DNA architectures: fluorophore assemblies and nanostructures." In XVth Symposium on Chemistry of Nucleic Acid Components. Prague: Institute of Organic Chemistry and Biochemistry, Academy of Sciences of the Czech Republic, 2011. http://dx.doi.org/10.1135/css201112095.

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Yoo, Jinkyoung, Binh-Minh Nguyen, Shadi A. Dayeh, Paul Schuele, David Evans, and S. T. Picraux. "Photovoltaic Performances of Three-dimensional Architecture Si Radial P-I-N Junction Nanowire Arrays." In Optical Nanostructures and Advanced Materials for Photovoltaics. Washington, D.C.: OSA, 2013. http://dx.doi.org/10.1364/pv.2013.pm2c.3.

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Narayan, R. J. "Novel Nanostructural Biomaterial Composites." In ASME 2002 International Mechanical Engineering Congress and Exposition. ASMEDC, 2002. http://dx.doi.org/10.1115/imece2002-39374.

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Hydrogen-free diamondlike carbon (DLC), with hardness values close to that of diamond, possess many desirable biocompatible properties for a variety of biomedical applications. The DLC coatings can be applied to joints prostheses, heart valves, and other medical devices. Unfortunately, hydrogen-free DLC coatings have a large compressive stresses which result in poor adhesion and wear characteristics. In this paper, we present results on silver doping of DLC to alleviate internal stresses as well as create DLC-Ag nanocomposites where Ag is in the form of nanoparticles. The Ag nanoparticles are expected to impart antimicrobial properties by providing sources of electrons. In the second part of the paper, we have created DLC and nanotube composites where nanotubes grow normal to the surface. This novel architecture not only alleviates internal stresses, but DLC + Nanotube composites have enhanced hardness and unique antimicrobial properties. Finally, we discuss novel multilayer DLC and hydroxyapatite (HA) composite where HA and DLC films are deposited sequentially at room temperature. The HA films with composites close to that of bone is considered very desirable for biocompatibility and integration with base structures. We discuss novel processing, characterization, hardness and bioeompatible properties of all these composites in detail.
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Lin, Ronghui. "Multifocal metalens based on multilayer Pancharatnam-Berry phase elements architecture (Conference Presentation)." In Photonic and Phononic Properties of Engineered Nanostructures X, edited by Ali Adibi, Shawn-Yu Lin, and Axel Scherer. SPIE, 2020. http://dx.doi.org/10.1117/12.2544940.

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Reports on the topic "Nanostructured architectures"

1

Dongarra, Jack, and Stanimire Tomov. Predicting the Electronic Properties of 3D, Million-atom Semiconductor nanostructure Architectures. Office of Scientific and Technical Information (OSTI), March 2012. http://dx.doi.org/10.2172/1036499.

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Nakano, Aiichiro, Rajiv K. Kalia, and Priya Vashishta. Computer Simulation of Strain Engineering and Photonics Semiconducting Nanostructure on Parallel Architectures. Fort Belvoir, VA: Defense Technical Information Center, February 2000. http://dx.doi.org/10.21236/ada384426.

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Hayward, Ryan. Self-assembly of cocontinuous nanostructured copolymer templates with compositional and architectural dispersity (Final Report). Office of Scientific and Technical Information (OSTI), April 2022. http://dx.doi.org/10.2172/1862319.

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