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Dissertations / Theses on the topic 'Graphite nanostructures'

Author: Grafiati
Published: 28 May 2022
Last updated: 30 July 2025

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1

Espeland, Erlend. "Gold Nanostructures on Graphite." Thesis, Norges teknisk-naturvitenskapelige universitet, Institutt for fysikk, 2013. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-22433.

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Gold nanoparticles supported on a graphite substrate are prepared by thermal evaporation, and subsequently studied by X-ray photoelectron spectroscopy (XPS), temperature programmed desorption (TPD) of carbon monoxide and scanning electron microscopy (SEM).Increasing the amount of gold deposited leads to a shift of the desorption peak to higher temperatures, and the gold particles become larger.Depositing approximately the same amount of gold at different evaporation ratios does not seem to affect the desorption.Triangularly shaped gold particles appeared at higher evaporation rates.This is tho
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2

Scott, Shelley Ann. "Self-assembly of Sb and Bi nanostructures on graphite." Thesis, University of Canterbury. Physics and Astronomy, 2005. http://hdl.handle.net/10092/5562.

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Spontaneous pattern formation in the natural world provides a constant source of wonder. Remarkable similarities exist between the patterns observed in the likes of snowflake growth, electrodeposition, and bacterial colonies. The driving force which creates similar patterns from these seemingly different processes is a non-equilibrium growth environment, which results from a diffusion field at the structures' boundary. Thin film growth from the vapour phase is an interesting and technologically important non-equilibrium system. Particles deposited on atomically flat and weakly interacting sub
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3

Karlsen, Terje Kultom. "Gold and Platinum Surface Nanostructures on Highly Oriented Pyrolytic Graphite." Thesis, Norges teknisk-naturvitenskapelige universitet, Institutt for fysikk, 2012. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-19411.

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Self-assembled platinum and gold nanostructures, which are formed by evaporation and subsequent diffusion limited aggregation of metal on highly oriented pyrolytic graphite, have been studied by photoemission spectroscopy and scanning electron microscopy. Dendritic gold nanostructures were observed on samples onto which gold was evaporated at room temperature. For samples onto which gold was evaporated at reduced temperatures, no such dendrites were found. For samples evaporated with platinum, small nano-spiders were seen at low evaporation time, and more complex fractal structures at higher e
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4

Grigonis, A., L. Marcinauskas, M. Carnauskas, and R. Kaliasas. "Graphite Nanostructures Produce in the Acetylene, Argon-Acetylene and Argon-Hydrogen-Acetylene Plasmas." Thesis, Sumy State University, 2012. http://essuir.sumdu.edu.ua/handle/123456789/35388.

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The amorphous carbon films were deposited on silicon-metal substrates by plasma jet chemical vapor deposition (PJCVD) and plasma enchanted CVD (PECVD). PJCVD carbon coatings have been prepared at atmospheric pressure in Ar/ C2H2 and Ar/H2/C2H2 mixtures. The films prepared in Ar/C2H2 plasma are attributed to graphite-like carbon films. Addition of the hydrogen decreases growth rate and the surface roughness of the coatings, but coatings have low fraction of oxygen (~5 at.%) The formation of the nanocrystalline graphite was obtained in Ar/H2/C2H2 plasma. The carbon nanotubes were synthesed
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5

Tasci, Emre. "Generation And Simulations Of Nanostructures Of Cage Structures." Phd thesis, METU, 2007. http://etd.lib.metu.edu.tr/upload/12608619/index.pdf.

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This thesis proposes algorithms to construct various nanosystems such as nanotori, nanogear and nanojunctions based on graphite type structures, exploiting the observed pentagonal and heptagonal defects. These produced systems are then simulated to test for their thermal stability and for their electronic properties. A brief review of the methods used is also included.
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6

Diaz, Chacon Lurayni. "Influence de charges carbonées sur la dissipation thermique de nouveaux composites diélectriques." Thesis, Montpellier, 2016. http://www.theses.fr/2016MONTT320/document.

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La plupart des équipements électroniques et électriques sont enrobés ou encapsulés par de la résine epoxy, choisie pour ses qualités physiques, chimiques et surtout diélectriques. Cependant, ce matériau présente un inconvénient majeur : sa faible conductivité thermique (0.2 W/mK). Dans ce contexte, nous avons élaboré et caractérisé des composites epoxy / carbone dans le but d’améliorer la conductivité thermique de ce type de résine tout en conservant ses propriétés diélectriques. Nous avons ainsi testé le potentiel d’une large gamme de charges carbonées, de structures, formes et tailles variée
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7

Stankevičienė, Inga. "Synthesis and coatings production of carbonaceous nanostructures." Doctoral thesis, Lithuanian Academic Libraries Network (LABT), 2012. http://vddb.laba.lt/obj/LT-eLABa-0001:E.02~2012~D_20121017_111706-30788.

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Films and coatings of carbonaceous nanostructures are employed in nanoelectronics, biotechnology and other fields. The aim of the research was to synthesize multi-walled carbon nanotubes and graphite oxide and fabricate coatings thereof. Consequently, multi-walled carbon nanotubes and their coatings were synthesized by the catalytic chemical vapour deposition method. As-grown carbon nanotubes inevitably contain remains of metal catalyst particles. A method developed in the laboratory using CCl4 was successfully applied to remove the residual catalyst from the batch of synthesized carbon nanotu
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8

Gnanaprakasa, Tony Jefferson. "Surface Engineering and Synthesis of Graphene and Fullerene Based Nanostructures." Diss., The University of Arizona, 2016. http://hdl.handle.net/10150/605216.

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Graphene is a two-dimensional carbon structure that exhibits remarkable structure-property relations. Consequently, there has been immense effort undertaken towards developing methods for graphene synthesis. Chemical vapor deposition (CVD) and chemical exfoliation from colloidal suspensions are two common methods used for obtaining graphene films. However, the underlying experimental conditions have to be carefully optimized in order to obtain graphene films of controllable thickness and morphology. In this context, a significant part of this dissertation was devoted towards developing and imp
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9

Kang, Seungyeon. "Femtosecond laser direct writing of 3D metallic structures and 2D graphite." Thesis, Harvard University, 2014. http://dissertations.umi.com/gsas.harvard:11495.

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This thesis explores a novel methodology to fabricate three dimensional (3D) metal-dielectric structures, and two dimensional (2D) graphite layers for emerging metamaterials and graphene applications. The investigations we report here go beyond the limitations of conventional fabrication techniques that require multiple post-processing steps and/or are restricted to fabrication in two dimensions. Our method combines photoreduction mechanism with an ultrafast laser direct writing process in innovative ways. This study aims to open the doors to new ways of manufacturing nanoelectronic and nanoph
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10

Mahapatra, Ojas. "A scanning probe microscopy (SPM) study of Bi(110) nanostructures on highly oriented pyrolytic graphite (HOPG)." Thesis, University of Canterbury. Physics and Astronomy, 2013. http://hdl.handle.net/10092/8042.

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This research work is aimed at understanding the electronic properties of Bi(110) nanostructures. This study chiefly uses Scanning Tunneling Microscopy (STM), Scanning Tunneling Spectroscopy (STS) and Non Contact Atomic Force Microscope (NCAFM) to investigate the geometric and electronic structure of Bi(110) islands on highly oriented pyrolytic graphite (HOPG) substrate. STM measurements are the primary focus of the thesis which involves imaging the bismuth islands and study of its atomic structure. STM images of the Bi(110) islands reveal a ‘wedding cake’ profile of the bismuth islands that
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11

Ortiz, Ophir. "The effects of varying plating variables on the morphology of palladium nanostructures for hydrogen sensing applications." [Tampa, Fla.] : University of South Florida, 2004. http://purl.fcla.edu/fcla/etd/SFE0000547.

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12

Geng, Yan. "Preparation and characterization of graphite nanoplatelet, graphene and graphene-polymer nanocomposites /." View abstract or full-text, 2009. http://library.ust.hk/cgi/db/thesis.pl?MECH%202009%20GENG.

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13

von, Deak Dieter G. "Heteroatom-containing Carbon Nanostructures as Oxygen Reduction Electrocatalysts for PEM and Direct Methanol Fuel Cells." The Ohio State University, 2011. http://rave.ohiolink.edu/etdc/view?acc_num=osu1313085489.

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14

France-Lanord, Arthur. "Transport électronique et thermique dans des nanostructures." Thesis, Université Paris-Saclay (ComUE), 2016. http://www.theses.fr/2016SACLS566/document.

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La miniaturisation continue des composants électroniques rend indispensable la connaissance des mécanismes de transport à l’échelle nanométrique. Alors que les processus simples de conduction dans les matériaux homogènes sont bien assimilés, la compréhension du transport à l’échelle nanométrique dans les systèmes hétérogènes reste à améliorer. Par exemple, le couplage entre courant, résistance et flux de chaleur dans des nanostructures doit être clarifié. Dans ce contexte, le sujet de thèse est centré autour du développement et de l’application de méthodes de calcul avancées pour la prédiction
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15

Celis, Retana Arlensiú Eréndira. "Gap en graphène sur des surfaces nanostructurées de SiC et des surfaces vicinales de métaux nobles." Thesis, Université Paris-Saclay (ComUE), 2016. http://www.theses.fr/2016SACLS417/document.

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L'électronique basée sur le graphène fait face à un verrou technologique, qui est l'absence d'une bande interdite (gap) permettant une commutation entre les états logiques allumé et éteint. Les nano-rubans de graphène rendent possible l'obtention de ce gap mais il est difficile de produire de tels rubans avec une largeur précise à l'échelle atomique et des bords bien ordonnés. Le confinement électronique est une façon élégante d'ouvrir un gap et peut en principe être réglé en ajustant la largeur des nano-rubans. Cette thèse est consacrée à la compréhension de l'ouverture du gap par nano-struct
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16

Fehse, Marcus. "Nanostructured titanium oxide as active insertion material for negative electrodes in Li-ion batteries." Phd thesis, Université Montpellier II - Sciences et Techniques du Languedoc, 2013. http://tel.archives-ouvertes.fr/tel-01018975.

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Titania based electrode materials are promising candidates to replace widely used graphite as negative electrode material in lithium ion batteries (LIB), due to their increased safety, volumetric capacity, and high rate performance.In this thesis different low-cost synthesis approaches are evaluated to prepare nanostructured TiO2 with various phase composition and morphology. The influence of these parameters on its ability to reversibly insert lithium are studied in electrochemical measurements. In this regard we also investigated the effect of aliovalent doping and porous structures on the i
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17

Risley, Mason J. "Surfactant-assisted exfoliation and processing of graphite and graphene." Thesis, Georgia Institute of Technology, 2013. http://hdl.handle.net/1853/48980.

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Surfactant assisted solution exfoliation of expanded graphite by means of sonication was carried out in an attempt to produce non-covalent charge functionality on the surface of graphene for the directed self assembly of graphene films on patterned substrates via electrostatic interactions. This thesis includes the results of experimental research associated with: 1) quantifying the effectiveness of various di-functionalized dithienothiophene surfactant small molecules, 2) further understanding the surface affinity and interaction mechanism between these surfactant molecules and the surface of
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18

Song, Zhimin. "Fabrication and Characterization of Nanopatterned Epitaxial Graphene Films for Carbon Based Electronics." Diss., Georgia Institute of Technology, 2006. http://hdl.handle.net/1853/13943.

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In this thesis, we show that planar graphene ribbons have properties similar to those of nanotubes. Both exhibit semiconducting or metallic properties depending on crystal orientation. The band gap varies approximately as the inverse of the ribbon width. Both can be doped and gated. Due to these similarities, the patterned graphene also has nanotube like transport properties, which include coherent transport, ballistic transport, and high current capabilities. In essential contrast to nanotubes, graphene ribbons can be rationally patterned using standard electron beam lithography methods; func
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19

Hong, Jeongmin. "Characteristics of graphitic films for carbon based magnetism and electronics." Diss., [Riverside, Calif.] : University of California, Riverside, 2009. http://proquest.umi.com/pqdweb?index=0&did=1957308731&SrchMode=2&sid=2&Fmt=2&VInst=PROD&VType=PQD&RQT=309&VName=PQD&TS=1269014102&clientId=48051.

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Thesis (Ph. D.)--University of California, Riverside, 2009.<br>Includes abstract. Available via ProQuest Digital Dissertations. Title from first page of PDF file (viewed March 19, 2010). Includes bibliographical references. Also issued in print.
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20

Chu, Hua-Wei. "Development of solution-processed methods for graphene synthesis and device fabrication." Diss., Georgia Institute of Technology, 2011. http://hdl.handle.net/1853/44738.

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Various solution-processed methods have been employed in this work. For the synthesis of graphene, a chemical exfoliation method has been used to generate large graphene flakes in the solution phase. In addition, chemical or electro polymerization has been used for synthesizing polyanthracene, which tends to form graphene nanoribbon through cyclodehydrogenation. For the device fabrication, graphene oxide (GO) thin films were deposited from solution phase on the vapor-silanzed aminosilane surface to make semiconducting active layer or conducting electrodes. Gold nanoparticles (AuNPs) were selec
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21

Förster, Georg Daniel. "Modélisation atomique de nanoparticules métalliques sur substrats carbonés et graphène épitaxié sur métaux." Thesis, Lyon 1, 2015. http://www.theses.fr/2015LYO10150/document.

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Les applications des nanoparticules métalliques nécessitent des assemblées monodisperses et stables sur un substrat tel que le graphène ou le graphite. Le graphène épitaxié sur métal (GEM) est étudié, car il facilite l'auto-organisation des adsorbats. La différence entre les mailles du graphène et du métal conduit à un effet de moiré contenant certaines régions favorables de l'adsorption. Ce travail est consacré surtout aux systèmes Ru-C et Pt-C où nous nous sommes intéressé au substrat du GEM nu, des agrégats y etant deposés et des agrégats métalliques sur graphite. Les potentiels d'ordre de
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22

Vieitas, de Amaral Dias Ana Inês. "Plasma based assembly and engineering of advanced carbon nanostructures." Thesis, Orléans, 2018. http://www.theses.fr/2018ORLE2019/document.

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L’environnement réactif du plasma constitue un outil puissant dans la science des matériaux, permettant la création de matériaux innovatifs et l'amélioration de matériaux existants qui ne serait autrement pas possible.Le plasma fournit simultanément des fluxes de particules chargées, des molécules chimiquement actives, des radicaux, de la chaleur, des photons, qui peuvent fortement influencer les voies d'assemblage à différentes échelles temporelles et spatiales, y compris à l’échelle atomique.Dans cette thèse de doctorat, des méthodes tenant pour base des plasmas micro-ondes ont été utilisées
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23

Poole, Timothy. "Acoustoelectric properties of graphene and graphene nanostructures." Thesis, University of Exeter, 2017. http://hdl.handle.net/10871/29838.

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The acoustoelectric effect in graphene and graphene nanoribbons (GNRs) on lithium niobate surface acoustic wave (SAW) devices was studied experimentally. Monolayer graphene produced by chemical vapour deposition was transferred to the SAW devices. The photoresponse of the acoustoelectric current (Iae) was characterised as a function of SAW frequency and intensity, and illumination wavelength (using 450 nm and 735 nm LEDs) and intensity. Under illumination, the measured Iae increased by more than the measured decrease in conductivity, while retaining a linear dependence on SAW intensity. The la
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24

Berrahal, Quentin. "Étude par STM de nanostructures métalliques dans le graphène : croissance, propriétés et défauts induits." Thesis, Université de Paris (2019-....), 2019. http://www.theses.fr/2019UNIP7030.

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Le graphène, premier cristal purement bidimensionnel à avoir été obtenu, possède des propriétés électroniques uniques grâce à sa structure de bande en « cône de Dirac ». Au-delà des modifications et du contrôle de ses propriétés intrinsèques, il est aujourd’hui crucial d’étudier ses interactions avec divers environnements afin de créer de nouvelles applications : fonctionnalisation par des molécules, utilisation en tant que substrat pour des molécules ou des atomes métalliques, création de défauts structuraux ou chimiques, élaboration de multicouches à l’aide d’autres matériaux quasi-bidimensi
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25

Pijeat, Joffrey. "Anthracenylporphyrin based building blocks for the bottom-up fabrication of nitrogen-doped graphene nanostructures." Thesis, Université Paris-Saclay (ComUE), 2019. http://www.theses.fr/2019SACLS346/document.

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La synthèse de graphène par approche « bottom-up » fait l’objet de nombreux travaux de recherche ayant pour but de contrôler les propriétés électroniques et optiques de ce matériau par la fabrication de nanostructures avec une précision atomique. D’autre part, le contrôle de dopant dans le graphène permettant d’en moduler les propriétés suscite un grand intérêt et dans ce contexte l’utilisation de porphyrines avec un taux d’azote contrôlé est attrayante. Par leurs ressemblances structurelles, les porphyrines π-étendues peuvent être considérées comme des nanoparticules de graphène dopées à l’az
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26

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 amé
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27

Li, Jing. "Electrical conducting polymer nanocomposites containing graphite nanoplatelets and carbon nanotubes /." View abstract or full-text, 2006. http://library.ust.hk/cgi/db/thesis.pl?MECH%202006%20LI.

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28

Gao, Pengcheng. "Matériaux carbonés nanostructurés pour supercapacités électrochimiques." Thesis, Montpellier 2, 2014. http://www.theses.fr/2014MON20028/document.

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Différents matériaux carbonés nanostructurés ont été synthétisés et mis en oeuvre comme matériaux supercapacitifs à double couche électrochimique (EDLC) ou comme substrats de matériaux pseudocapacitifs avec pour objectif d'augmenter leur densité de puissance. Nous avons ainsi développé une méthode de synthèse simple et originale de carbures de silicium (SiC) qui procède par une réduction topotactique d'un composite silice/carbon par le magnésium. Du fait de la température de synthèse inférieure à 800°C, SiC résultant conserve la morphologie et/ou la structure poreuse du précurseur composite. P
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29

Rhoads, Daniel Joseph. "A Mathematical Model of Graphene Nanostructures." University of Akron / OhioLINK, 2015. http://rave.ohiolink.edu/etdc/view?acc_num=akron1438978423.

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30

Rodriguez-Nieva, Joaquin F. (Joaquin Francisco). "Novel electronic behaviors in graphene nanostructures." Thesis, Massachusetts Institute of Technology, 2016. http://hdl.handle.net/1721.1/107041.

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Thesis: Ph. D., Massachusetts Institute of Technology, Department of Physics, 2016.<br>Cataloged from PDF version of thesis.<br>Includes bibliographical references (pages 167-185).<br>Recently, it has been shown that graphene can be combined with a variety of nanoscale systems, such as other two-dimensional crystals, to form novel electronic nanostructures. These systems inherit the unique characteristics of graphene, such as high mobility, Berry phase, photoresponse mediated by hot carriers, and at the same time acquire new features due to nanoscale heterogenities. In this thesis, I explore t
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31

Hu, Tao. "Non-covalent functionalization of carbon nanostructures : a DFT study." Thesis, Toulouse, INSA, 2013. http://www.theses.fr/2013ISAT0011/document.

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Le dopage non covalent de nanostructures carbonées par transfert de charge depuis/vers des molécules donneuses ou acceptrices (EDA) ou bien par des molécules d’acide sulfurique H2SO4, est considéré comme potentiellement intéressant pour de nombreuses applications. Parmi celles-ci on peut citer: capteur chimique, transistor à effet de champ, et d’autre l'électronique. Cependant, d'un point de vue théorique, on en sait peu au sujet de ces processus de transfert de charge par électrons ou par trous.Dans un premier temps, nous nous sommes intéressés à l’interaction entre des molécules d’acide sulf
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Musheghyan, Avetisyan Arevik. "Synthesis and characterization of multilayer graphene nanostructures." Doctoral thesis, Universitat de Barcelona, 2019. http://hdl.handle.net/10803/667645.

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The goal of the present investigation is to examine the processing-structure-property relationships of multilayer graphene nanowall materials. Various plasma enhanced chemical vapor deposition (PECVD) processing parameters were altered to control the structure and morphology of the material. Growth parameters and substrate material were the major structural features studied, and these were characterized by spectroscopic techniques. The direct synthesis of graphene without catalysis on dielectric substrates, compatible with the complementary metal oxide semiconductor technology, is a stimulatin
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33

Poole, Christopher J. "Electronic and transport properties of graphene nanostructures." Thesis, Lancaster University, 2012. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.654742.

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34

Vu, Van Binh. "Theoretical studies of novel graphene based nanostructures." Electronic Thesis or Diss., université Paris-Saclay, 2024. http://www.theses.fr/2024UPASP039.

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Depuis sa découverte, le graphène est devenu un centre de recherche et d'intérêt important en raison de ses caractéristiques mécaniques, thermiques et électriques exceptionnelles. Néanmoins, l'absence de bande interdite dans le graphène constitue un obstacle aux applications dans les domaines de l'optique, de la nanoélectronique et de la spintronique. L'ingénierie de la bande interdite impliquant la nanostructuration du graphène a été développée au fil des ans, par exemple par confinement quantique, pour surmonter cette limitation. Ce travail théorique est consacré à la modification des répons
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35

Huppert, Simon. "Transport non-linéaire et génération Terahertz dans des systèmes bidimensionnels sous forte irradiation optique." Thesis, Paris 6, 2014. http://www.theses.fr/2014PA066217/document.

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Cette thèse traite de comportements non-linéaires dans deux types de systèmes bidimensionnels différents: les hétérostructures semiconductrices ainsi qu'un matériau monocouche, le graphène. Elle comporte deux axes principaux: l'étude de la quantification de Wannier-Stark dans les super-réseaux de puits quantiques biaisés électriquement, et la modélisation d'effets nouveaux pour la génération de rayonnement électromagnétique dans le domaine Terahertz. Dans les super-réseaux de puits quantiques soumis à une tension externe, le champ électrique induit un confinement bidimensionnel des porteurs de
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36

Wang, Shu Jun. "Applications of graphene for transparent conductors and polymer nanocomposites /." View abstract or full-text, 2009. http://library.ust.hk/cgi/db/thesis.pl?MECH%202009%20WANGS.

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37

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
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38

Federspiel, Francois. "Etude optique du transfert d'énergie entre une nanostructure semiconductrice unique et un feuillet de graphène." Thesis, Strasbourg, 2015. http://www.theses.fr/2015STRAE015/document.

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Mes travaux de thèse portent sur l’interaction de type FRET (tranfert d’énergie résonant de Förster) entre une nanostructure semiconductrice colloïdale individuelle et le graphène. La première partie concerne l’établissement de la théorie du FRET et ce pour plusieurs types de nanostructures. Vient ensuite la partie expérimentale, à commencer par le montage optique ainsi que les méthodes d’analyse, tant pour la spectroscopie que pour la photoluminescence. Par la suite, nous décrivons les résultats obtenus pour divers types de nanocristaux sphériques en interaction directe avec le graphène (incl
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Kalaitzidou, Kyriaki. "Exfoliated graphite nanoplatelets as reinforcement for multifunctional polypropylene nanocomposites." Diss., Connect to online resource - MSU authorized users, 2006.

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Thesis (Ph. D.)--Michigan State University. Dept. of Chemical Engineering and Materials Science, 2006.<br>Title from PDF t.p. (viewed on June 19, 2009) Includes bibliographical references. Also issued in print.
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40

Droth, Matthias [Verfasser]. "Spins and Phonons in Graphene Nanostructures / Matthias Droth." Konstanz : Bibliothek der Universität Konstanz, 2015. http://d-nb.info/1081551984/34.

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41

Mayorov, Alexander. "Tunnelling and noise in GaAs and graphene nanostructures." Thesis, University of Exeter, 2008. http://hdl.handle.net/10036/46914.

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Experimental studies presented in this thesis have shown the first realisation of resonant tunnelling transport through two impurities in a vertical double-barrier tunnelling diode; have proved the chiral nature of charge carriers in graphene by studying ballistic transport through graphene $p$-$n$ junctions; have demonstrated significant differences of $1/f$ noise in graphene compared with conventional two-dimensional systems. Magnetic field parallel to the current has been used to investigate resonant tunnelling through a double impurity in a vertical double-barrier resonant tunnelling diode
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42

Gorbachev, Roman. "Fabrication and transport properties of graphene-based nanostructures." Thesis, University of Exeter, 2009. http://hdl.handle.net/10036/89275.

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In this work fabrication and studies of transistor structures based on an atomic sheet of graphite, graphene, are described. Since graphene technology is in its early stages, the development and optimisation of the fabrication process are very important. In this work the impact of various fabrication conditions on the quality of graphene devices is investigated, in particular the effects on the carrier mobility of the details of the mechanical exfoliation procedure, such as environmental conditions and humidity, source of graphite and wafer cleaning procedure. In addition, a comparison is made
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43

Albert, Guillaume. "Transport mésoscopique dans les nanostructures hybrides supraconducteur-graphène." Phd thesis, Université de Grenoble, 2011. http://tel.archives-ouvertes.fr/tel-00680038.

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Cette thèse présente une étude des propriétés de transport à basse température d'échantillons de graphène exfolié. Une première série de mesures menée à une température de 4 Kelvins sur des échantillons contactés par des électrodes constituées d'une bicouche titane/or révèle les phénomènes d'effet Hall quantique et de fluctuations universelles de conductance. L'effet Hall présente une quantification demi-entière propre au graphène. Le caractère universel des fluctuations de conductance est confirmé par les mesures, et une réduction de la longueur de cohérence de phase est observée au point de
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44

Mishra, Shantanu, Thorsten G. Lohr, Carlo A. Pignedoli, et al. "Tailoring Bond Topologies in Open-Shell Graphene Nanostructures." ACS Publications, 2018. https://tud.qucosa.de/id/qucosa%3A36585.

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Polycyclic aromatic hydrocarbons exhibit a rich spectrum of physicochemical properties depending on the size and, more critically, on the edge and bond topologies. Among them, open-shell systems - molecules hosting unpaired electron densities - represent an important class of materials for organic electronic, spintronic, and optoelectronic devices, but remain challenging to synthesize in solution. We report the on-surface synthesis and scanning tunneling microscopy- and spectroscopybased study of two ultralow-gap open-shell molecules, namely peri-tetracene, a benzenoid graphene fragment with z
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45

Frizera, Borghi Fabricio. "Fabrication And Biological Applications Of Graphene-Based Nanostructures." Thesis, The University of Sydney, 2016. http://hdl.handle.net/2123/15657.

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Graphene received increasing attention for sensing and biomedical applications due to its properties. However, the current production methods are resource consuming, struggle to integrate these films into devices, and hardly produce graphene nanostructures (GN) that improve desired film properties like surface area and reactivity. This thesis aims to use a plasma-enhanced technique to produce GN and to explore their potential biological applications. The control of GN using the plasma-enhanced chemical vapour deposition (PECVD) was investigated. Growth parameters were related with the nanostru
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46

Ogbazghi, Asmerom Yemane. "Conductance through Nanometer-scale Metal-to-Graphite Contacts." Diss., Georgia Institute of Technology, 2005. http://hdl.handle.net/1853/6872.

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The metal/graphite interface is interesting due to the typically large disparity in the characteristics of the electronic structure (e.g. Fermi wavelength and Fermi energy) and dimensionality (3D in the metal versus quasi-2D in graphite). The goal of this work is to determine how the contact conductance to graphite depends on the metal contact area for nanometer-scale contacts. From this we deduce the effect of electronic screening in the graphite. Three different metals were chosen for this work: Solid Cu and Al, and liquid Ga. Liquid Ga provided a unique opportunity to reduce the effect o
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47

MANGADLAO, JOEY DACULA. "Multifunctional Materials from Nanostructured Graphene and Derivatives." Case Western Reserve University School of Graduate Studies / OhioLINK, 2016. http://rave.ohiolink.edu/etdc/view?acc_num=case1448279230.

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48

Zedan, Abdallah. "GRAPHENE-BASED SEMICONDUCTOR AND METALLIC NANOSTRUCTURED MATERIALS." VCU Scholars Compass, 2013. http://scholarscompass.vcu.edu/etd/457.

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Exciting periods of scientific research are often associated with discoveries of novel materials. Such period was brought about by the successful preparation of graphene which is a 2D allotrope of carbon with remarkable electronic, optical and mechanical properties. Functional graphene-based nanocomposites have great promise for applications in various fields such as energy conversion, opteoelectronics, solar cells, sensing, catalysis and biomedicine. Herein, microwave and laser-assisted synthetic approaches were developed for decorating graphene with various semiconductor, metallic or magneti
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49

Bouakaz, Boubkeur Seddik. "Effets de synergies entre montmorillonites organophiles (OMMT) et graphène dans les nanocomposites à base de polymères biodégradables." Thesis, Lorient, 2017. http://www.theses.fr/2017LORIS430/document.

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Les travaux réalisés au cours de cette thèse traitent et misent en avant l’effet d’associer différents types d’argiles organophiles OMMT (Cloisite®15A et Cloisite®30B) avec le graphène fonctionnalisé époxy (Gr) sur l’ensemble des propriétés fonctionnelles des matrices biodégradables polyacide lactique (PLA), poly (ε-caprolactone) (PCL) et leur mélange PLA/PCL de composition 70/30. Le premier volet est consacré à l’étude des mélanges binaires (PLA/Cloisite® et PLA/Gr) et ternaires (PLA/Cloisite®/Gr) préparés à l’état fondu. L’association des deux renforts OMMT/Gr a amélioré l’ensemble des param
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50

Downey, Justin Michael. "Investigation of the microstructure of nuclear grade matrix graphite." Thesis, Nelson Mandela Metropolitan University, 2009. http://hdl.handle.net/10948/944.

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This dissertation focuses on the investigation of the microstructures of two nuclear grade matrix graphites. These graphites were intended for use in the core components of a high temperature test reactor (HTTR) of the pebble bed modular reactor (PBMR) design. The graphites were provided in the form of fuel spheres and a reflector block. The techniques used in the analysis of the materials include fracturing, etching, scanning electron microscopy (SEM), nano-indentation, x-ray diffraction (XRD) and transmission electron microscopy (TEM). The microstructures of the materials were characterized
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