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Dissertations / Theses on the topic 'GRAPHIDE OXIDE'

Author: Grafiati

Published: 11 September 2023

Last updated: 31 July 2025

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1

Avril, Florian. "Contribution à l'élaboration d'un supercondensateur à basse de graphène." Thesis, Montpellier, 2018. http://www.theses.fr/2018MONTS034/document.

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L'utilisation de l'énergie des micro-sources de production d'électricité est un concept prometteur qui consiste à récolter des sources d'énergie faible et diffuse présent dans notre environnement pour l’alimentation de systèmes autonomes. Le nombre en croissance de nouveaux appareils miniaturisés et communicants dans les domaines civils et militaires devrait accentuer le phénomène de dépendance énergétique et ouvre de nouveaux marché.Parmi les éventuelles sources d’énergies renouvelables, l’énergie solaire est la source la plus prometteuse car elle est potentiellement la plus puissante et la m

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2

Nyangiwe, Nangamso Nathaniel. "Graphene based nano-coatings: synthesis and physical-chemical investigations." Thesis, UWC, 2012. http://hdl.handle.net/11394/3237.

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Magister Scientiae - MSc<br>It is well known that a lead pencil is made of graphite, a naturally form of carbon, this is important but not very exciting. The exciting part is that graphite contains stacked layers of graphene and each and every layer is one atom thick. Scientists believed that these graphene layers could not be isolated from graphite because they were thought to be thermodynamically unstable on their own and taking them out from the parent graphite crystal will lead them to collapse and not forming a layer. The question arose, how thin one could make graphite. Two scienti

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3

Arbuzov, A. A., V. E. Muradyan, and B. P. Tarasov. "Synthesis of Few-layer Graphene Sheets via Chemical and Thermal Reduction of Graphite Oxide." Thesis, Sumy State University, 2012. http://essuir.sumdu.edu.ua/handle/123456789/35063.

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Few-layer graphene sheets were produced from graphite oxide (GO) chemical and thermal reduction. For the chemical reduction of GO as reducing agents were used hydrazine hydrate, hydroxylammonium chloride, sodium borohydride and sodium sulfite. The reduced material was characterized by elemental analysis, thermo-gravimetric analysis, scanning electron microscopy, X-ray diffraction, Fourier transform infrared and Raman spectroscopy. A comparison of the deoxygenation efficiency of graphene oxide suspension by different method or reductants has been made, revealing that the highest degree

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4

Sokolov, Denis A. "Investigation of Graphene Formation from Graphite Oxide and Silicon Carbide." Diss., Georgia Institute of Technology, 2013. http://hdl.handle.net/1853/53642.

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Graphene is a novel two dimensional material that is revolutionizing many areas of science and it is no surprise that a significant amount of effort is dedicated to its investigation. One of the major areas of graphene research is the development of procedures for large scale production. Among many recently developed methodologies, graphene oxide reduction stands out as a straightforward and scalable procedure for producing final material with properties similar to those of graphene. Laser reduction of graphite oxide is one of the novel approaches for producing multilayer graphene, and this wo

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5

Pakulski, Dawid. "Graphene based materials and their potential applications." Thesis, Strasbourg, 2019. http://www.theses.fr/2019STRAF060.

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Cette thèse de doctorat a pour objectif scientifique la synthèse de matériaux bidimensionnels fonctionnalisés (graphène et oxyde de graphène) et leur caractérisation physicochimique complète, avec un accent particulier apporté sur les propriétés d'adsorption et de stockage d'énergie. Nous avons démontré que la modification covalente de l'oxyde de graphène (GO) avec un polymère organique (BPEI) affecte très favorablement l'efficacité du processus d'adsorption. Les valeurs de la capacité maximale d'adsorption (qmax) des ions de métaux lourds favorisent de manière significative ce matériau par ra

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6

Alami, Omar. "Oxyde de graphène fonctionnalisés par des dendrons et dendrimères pour des applications en oncologie." Thesis, Toulouse 3, 2022. http://www.theses.fr/2022TOU30086.

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Le graphène, une monocouche d'atomes de carbone densément tassée dans un réseau en nid d'abeille, a été isolé pour la première fois en 2004. Ces dernières années, la recherche sur le graphène et ses dérivés a suscité un intérêt considérable dans un large éventail d'activités de recherche grâce à ses propriétés intéressantes. La voie la plus facile et polyvalente pour obtenir des nanocomposites à base de graphène consiste à oxyder le graphite naturel pour obtenir l’oxyde de graphène (GO), un matériau ayant une surface riche en fonctions chimiques modifiables. Des nanocomposites à base d’oxyde d

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7

Leve, Zandile Dennis. "Determination of paracetamol at the electrochemically reduced graphene oxide-metal nanocomposite modified pencil graphite (ERGO-MC-PGE) electrode using adsorptive stripping differential pulse voltammetry." University of Western Cape, 2020. http://hdl.handle.net/11394/7350.

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>Magister Scientiae - MSc<br>This project focuses on the development of simple, highly sensitive, accurate, and low cost electrochemical sensors based on the modification of pencil graphite electrodes by the electrochemical reduction of graphene oxide-metal salts as nanocomposites (ERGO-MC-PGE; MC = Sb or Au nanocomposite). The electrochemical sensors ERGO-Sb-PGE and ERGO-Au-PGE were used in the determination of paracetamol (PC) in pharmaceutical formulations using adsorptive stripping differential pulse voltammetry. The GO was prepared from graphite via a modified Hummers’ method and characte

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8

Nasr, Maryline. "Elaboration of oxides membranes by electrospinning for photocatalytic applications." Thesis, Montpellier, 2017. http://www.theses.fr/2017MONTT210/document.

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De nos jours, les produits chimiques toxiques industriels ne sont pas toujours traités proprement, et leurs contaminants peuvent directement affecter la sécurité de l'eau potable. La photocatalyse, «une technologie verte» est une approche efficace et économique qui joue un rôle important dans la conversion de l'énergie solaire et la dégradation des polluants organiques. Ce manuscrit de thèse rapporte sur le développement des matériaux avancés (basés sur TiO2 et ZnO) susceptibles d'exploiter l'énergie solaire renouvelable pour résoudre les problèmes de pollution environnementale. Une partie de

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9

Dahlberg, Tobias. "The first order Raman spectrum of isotope labelled nitrogen-doped reduced graphene oxide." Thesis, Umeå universitet, Institutionen för fysik, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-116699.

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The topic of this thesis is the study of nitrogen functionalities in nitrogen-doped reduced graphene oxide using Raman spectroscopy. Specifically, the project set out to investigate if the Raman active nitrogen-related vibrational modes of graphene can be identified via isotope labelling. Previous studies have used Raman spectroscopy to characterise nitrogen doped graphene, but none has employed the method of isotope labelling to do so. The study was conducted by producing undoped, nitrogen-doped and nitrogen-15-doped reduced graphene oxide and comparing the differences in the first-order Rama

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10

Arbuzov, A. A., V. E. Muradyan, B. P. Tarasov, and E. A. Sokolov. "Preparation of Amino-Functionalized Graphene Sheets and their Conductive Properties." Thesis, Sumy State University, 2013. http://essuir.sumdu.edu.ua/handle/123456789/35639.

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Amino-functionalized graphene sheets were prepared through chemical reduction by hydrazine hy-drate, amination or amidation of graphite oxide. For amination of graphite oxide were used polyamine such as ethylenediamine, diethylenetriamine and triethylenetetramine. Addition of amine groups to graphene is identified by Fourier transform infrared spectroscopy, Raman spectroscopy, elemental analysis and ther-mogravimetry. Scanning electron microscopy data indicate that the organic amine is not only as nitrogen sources to obtain the nitrogen-doped graphene but also as an important modification to c

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11

Mach, Radoslav. "Vlastnosti grafenoidových vrstev." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2018. http://www.nusl.cz/ntk/nusl-377055.

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Master thesis “Properties of graphenoid layers” deals with materials of graphenoid nature such as graphene, graphene oxide and its reduced state. The paper effectively summarize basic theoretical knowledge in the first half of its range. In the second half the project deals with practical part consisted of experiments with application of graphene oxide solvents, its analysis and especially comparing properties of non-reduced graphene oxide with its chemically reduced form. Material is examined in a form of applied thin layers on different substrates.

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12

Mowry, Michael N. "In situ Raman Spectroscopy Study of the Formation of Graphene from Urea and Graphite Oxide." Thesis, Monterey, California. Naval Postgraduate School, 2012. http://hdl.handle.net/10945/17424.

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Approved for public release; distribution is unlimited<br>Graphene, 10 or fewer atomic layers of carbon atoms, has attracted much attention during recent years due to its unique structure and exceptional physical properties. While there exist a wide range of potential applications, as with many nanomaterials, new synthesis techniques are required that allow for a production of graphene on an industrial scale. In this study, in situ Raman spectroscopy was used to study the formation and doping of graphene during urea-assisted thermal exfoliation of graphite oxide (GO), a promising new synthesis

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13

Pradhan, Siddharth. "Quantification of Graphene Oxide Structure Using an Improved Model." University of Cincinnati / OhioLINK, 2012. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1342730902.

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14

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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15

Kiryukhin, D. P., Y. M. Shulga, S. A. Baskakov, G. A. Kichigina, P. P. Kushch, and A. Michtchenko. "Low Temperature Post Radiation Polymerization of Tetrafluoroethylene in the Presence of the Graphene 3D Material." Thesis, Sumy State University, 2013. http://essuir.sumdu.edu.ua/handle/123456789/35597.

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It was found that irradiation by γ-rays at the liquid nitrogen temperature of a mixture of C2F4 with the grapheme 3D material obtained by explosive exfoliation of graphite oxide gives a composite in which the concentration of polytetrafluoroethylene is 80 wt %. In the case of C2F4 polymerization under similar conditions in the absence of the carbon material, the PTFE yield is six times lower. The results of certifica-tion of both the parent carbon material and the composite obtained via polymerization are also reported. When you are citing the document, use the following link http://essuir.sum

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16

Al, Zohbi Fatima. "Etude de Polyanilines et de nanocomposites Polyaniline/Graphène en milieu liquide ionique protique pour la réalisation de supercondensateurs." Thesis, Tours, 2016. http://www.theses.fr/2016TOUR4026/document.

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Les travaux réalisés dans le cadre de cette thèse ont porté sur la réalisation de polymères conducteurs de type polyaniline et de leurs composites associés à du graphène en vue d’une utilisation en tant que matériaux d’électrodes dans des dispositifs de stockage d’énergie de type supercondensateurs. Les travaux se sont tout d’abord orientés sur la synthèse de nouveaux liquides ioniques protiques (LIP) associant des cations pyrrolidinium (Pyrr+) et imidazolium (Imi+) avec des anions p-toluène sulfonate (PTS-), hydrogénosulfate (HSO4-) ou (+)-camphre-10-sulfonate (Cs-), et de l’étude de leur pro

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17

Hamandi, Marwa. "Élaboration et caractérisation d’oxydes de Titane de Morphologie Contrôlée : application à la Photodégradation de Polluants Organiques." Thesis, Lyon, 2017. http://www.theses.fr/2017LYSE1077/document.

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Ce travail se résume en deux objectifs principaux. Le premier concerne l'élaboration de matériaux nanohybrides de dioxyde de titane (sous forme sphérique ou tubulaire) décoré par des allotropes de carbone (fullerène fonctionnalisé ou graphène). Le deuxième objectif consiste à l'évaluation de ces différents nanomatériaux dans la photodégradation de l'acide formique (AF) sous irradiation UV. Un effet bénéfique des allotropes de carbone sur l'activité photocatalytique des nanohybrides a été observé suite à l'augmentation de la durée de vie des paires électron-trou photogénérées. Dans un premier t

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18

Guimont, Aline. "Greffage de polydimethylsiloxane et de polyéthylène sur des feuillets de graphène oxydé : application à la synthèse de (nano)composites conducteurs." Thesis, Lyon 1, 2013. http://www.theses.fr/2013LYO10028/document.

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L'objectif de la thèse est d'expérimenter et de valider de nouvelles voies d'exfoliation des feuillets de graphène dans des élastomères de type silicone (PDMS) et des thermoplastiques de type polyéthylène (PE). Ce projet s'appuie sur des étapes de modifications chimiques des feuillets de graphite oxydé (GO) dont la polarité initiale n'offre pas une compatibilité satisfaisante avec les matrices étudiées. Différentes approches ont été explorées : la synthèse du GO greffé PDMS a été réalisée avec succès par greffage directe d'un PDMS fonctionnalisé triéthoxysilane et par une réaction d'hydrosilyl

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19

Tekenya, Ronald. "Graphene-modified pencil graphite mercury-film electrodes for the determination of trace metals by cathodic adsorptive stripping voltammetry." University of the Western Cape, 2018. http://hdl.handle.net/11394/6552.

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>Magister Scientiae - MSc<br>This project focuses on the simple, fast and highly sensitive adsorptive stripping voltammetry detection of Nickel and Cobalt complexed with DMG and Nioxime respectively at a Reduced Graphene Oxide modified pencil graphite electrode in water samples. This research as well demonstrates a novel electrochemically reduced graphene oxide (ERGO)/mercury film (MF) nanocomposite modified PGE, prepared through successive electrochemical reduction of graphene oxide (GO) sheets and in-situ plated mercury film. The GO and graphene were characterized using FT-IR, HR-SEM,

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20

Huang, Xianjun. "Electromagnetic applications of graphene and graphene oxide." Thesis, University of Manchester, 2016. https://www.research.manchester.ac.uk/portal/en/theses/electromagnetic-applications-of-graphene-and-graphene-oxide(873c9618-19a3-4818-b47a-9afbca39857c).html.

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Since the isolation of graphene in 2004, a large amount of research has been directed at 2D materials and their applications due to their unique characteristics. This thesis delivers pioneering developments on the applications of graphene and graphene oxide (GO) on electromagnetic ranges such as radio frequency, microwave frequency and THz bands, and specifically 2D materials based antennas, absorbers, sensors and etc. This thesis focuses on exploring electromagnetic applications of monolayer graphene, printed graphene and graphene oxide. In study of monolayer graphene applications, the theore

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21

Roman, Julien. "Mise en forme de matériaux carbonés biosourcés par voie liquide." Thesis, Bordeaux, 2019. http://www.theses.fr/2019BORD0202/document.

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Ce travail de thèse est consacré à la mise en forme de nouveaux matériaux carbonés à partir d’un précurseur biosourcé. Les matériaux carbonés tels que les fibres de carbone utilisés dans les composites sont principalement obtenus à partir de précurseurs d’origine pétrosourcée. Ces précurseurs sont onéreux et incompatibles avec une industrie durable. L’utilisation d’un précurseur biosourcé disponible en grande quantité tel que la lignine permet de pallier ces limitations. La structure moléculaire aromatique et la teneur élevée en carbone de la lignine font d’elle un candidat idéal pour l’élabor

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22

Lagier, Laura. "Ecotoxicité comparative de l'oxyde de graphène et d'autres nanoparticules de carbone chez des organismes aquatiques modèles : d'une évaluation en conditions monospécifiques vers l'étude d'une chaîne trophique expérimentale." Thesis, Toulouse 3, 2017. http://www.theses.fr/2017TOU30270/document.

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L'écotoxicité de différentes nanoparticules de carbone (NPC) a été évaluée chez des organismes aquatiques, en particulier chez Xenopus laevis. Il a été montré que la surface des NPC est le paramètre le plus pertinent pour décrire l'inhibition de croissance chez le xénope, indépendamment de leur forme allotropique et de leur état de dispersion. L'induction des micronoyaux a aussi été étudiée chez le xénope, et l'oxyde de graphène (GO) s'est révélé génotoxique à faible dose, résultat corroboré par l'étude de l'expression des gènes. Les mécanismes de toxicité impliqués seraient notamment liés aux

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23

Paulauskas, Mindaugas. "Pervaporation using graphene oxide membranes." Thesis, University of Leeds, 2015. http://etheses.whiterose.ac.uk/12282/.

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Pervaporation is a perspective fluid separation technology. Membranes are widely recognised for their energy and capital cost savings. Currently, most of the research is focused on developing new membrane material that are stable in a wide range of temperatures in a presence of organic solvents. This research is focused on a graphene oxide, a novel and highly selective membrane material. Graphene oxide has attracted a lot of academic research attention. Many researchers have demonstrated selective water removal using this material, however moving forward the data lack the scope and depth of un

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Jankus, Daniel James. "Antimicrobial Properties of Graphite and Coal-Derived Graphene Oxides as an Advanced Coating for Titanium Implants." Thesis, Virginia Tech, 2021. http://hdl.handle.net/10919/103151.

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Prosthetic joint infection (PJI) poses a significant risk to implanted patients, requiring multiple surgeries with high rates of reinfection. The primary cause of such infections is otherwise innocuous bacterial species present on the skin that have survived sterilization protocols. Antibiotic drugs have significantly reduced efficacy due to the lack of vasculature in the newly implanted site, allowing microbes to form biofilms with even greater resistance. Graphene oxide (GO) is known to have good biocompatibility while providing drugless antimicrobial properties. The focus of this study is o

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25

Lee, Dongwook. "The structure and magnetism of graphite oxide." Thesis, University of Cambridge, 2009. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.611649.

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Bourourou, Mariem. "Conception des bioélectrodes enzymatiques à base de nanomatériaux dans des piles à combustible et des capteurs." Thesis, Université Grenoble Alpes (ComUE), 2015. http://www.theses.fr/2015GREAI043/document.

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Le travail présenté dans ce manuscrit est une contribution à la recherche sur la mise en forme d'une nouvelle classe de bioélectrodes nanostructurées, principalement à base de nanotubes de carbone (NTCs). L'oxyde de graphène (GO) a été également évalué pour des applications bioélectrochimiques. Les procédés de fabrication développés autorisent l'ajout d'additifs tels que des médiateurs et des polymères. L'optimisation de la connexion enzymatique de la laccase pour la réduction de l'O2 sur des matrices de nanotubes de carbone ainsi que de la polyphénol oxydase (PPO) pour la détection électrochi

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27

Ghaffari, Nastaran. "Electrochemical deposition of Graphene Oxide- metal nano-composite on Pencil-Graphite Electrode for the high sensitivity detection of Bisphenol A by Adsorptive Stripping Differential Pulse Voltammetry." University of the Western Cape, 2018. http://hdl.handle.net/11394/6336.

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Magister Scientiae - MSc (Chemistry)<br>Electrochemical platforms were developed based on pencil graphite electrodes (PGEs) modified electrochemically with reduced graphene oxide metal nanoparticles (ERGO–metalNPs) composite and used for the high-sensitivity determination of Bisphenol A (BPA) in water samples. Synergistic effects of both reduced Graphene Oxide sheets and metal nanoparticles on the performance of the pencil graphite electrode (PGE) were demonstrated in the oxidation of BPA by differential pulse voltammetry (DPV). A solution of graphene oxide (GO) 1 mg mL-1 and 15 ppm of m

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Moraes, Ana Carolina Mazarin de 1983. "Graphene oxide and graphene oxide functionalized with silver nanoparticles : antibacterial activity and polymeric composites applications." [s.n.], 2015. http://repositorio.unicamp.br/jspui/handle/REPOSIP/249034.

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Orientador: Oswaldo Luiz Alves<br>Tese (doutorado) - Universidade Estadual de Campinas, Instituto de Química<br>Made available in DSpace on 2018-08-27T15:35:46Z (GMT). No. of bitstreams: 1 Moraes_AnaCarolinaMazarinde_D.pdf: 5504556 bytes, checksum: ff8566e313e82701925549e2ecd544ab (MD5) Previous issue date: 2015<br>Resumo: O óxido de grafeno (GO) é uma forma quimicamente modificada de grafeno que possui grupos funcionais contendo oxigênio (epóxi, carboxila, carbonila, e hidroxila) distribuídos sobre a base e as bordas de suas folhas. Devido à abundância dos grupamentos oxigenados, o GO tem s

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Vacchi, Isabella Anna. "Controlled chemical functionalization of graphene oxide." Thesis, Strasbourg, 2017. http://www.theses.fr/2017STRAF053.

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L’oxyde de graphène est un nanomatériau prometteur grâce à ses caractéristiques physicochimiques. Cependant, jusqu’à aujourd’hui, sa composition exacte reste encore inconnue. Ceci est dû à la complexité et au caractère non-stoechiométrique de ce matériau. Nous avons commencé par étudier sa composition de surface et sa réactivité. Nous avons utilisé des échantillons synthétisés de manière différente pour explorer la relation entre la méthode de synthèse et la composition de surface. En outre, nous avons préparé un dérivé fonctionnalisé avec un agent chélatant de radionucléides pour étudier sa b

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Liu, Shizhen. "Graphene oxide and graphene based catalysts in photochemical ractions." Thesis, Curtin University, 2013. http://hdl.handle.net/20.500.11937/882.

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Graphene has impressible absorbing ability and its electron transmission capacity makes it a great prosperity in many science horizons. In this study graphene or graphite nitride has been employed as a carrier in order to modify TiO2, ZnO and Ta2O5 photocatalysts.Graphene modified TiO2 particles were obtained by a sol-gel method from titanium isoproproxide (or P25) and reduced graphene oxide (RGO). The X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR), field emission scanning electron microscopy (FE-SEM), UV-vis diffuse reflectance (UV-vis DRS) and thermo gravimetric dif

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Adewole, Murthada Oladele. "Electrically Tunable Absorption and Perfect Absorption Using Aluminum Doped Zinc Oxide and Graphene Sandwiched in Oxides." Thesis, University of North Texas, 2012. https://digital.library.unt.edu/ark:/67531/metadc1404566/.

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Understanding the fundamental physics in light absorption and perfect light absorption is vital for device applications in detector, sensor, solar energy harvesting and imaging. In this research study, a large area fabrication of Al-doped ZnO/Al2O3/graphene/Al2O3/gold/silicon device was enabled by a spin-processable hydrophilic mono-layer graphene oxide. In contrast to the optical properties of noble metals, which cannot be tuned or changed, the permittivity of transparent metal oxides, such as Al-doped ZnO and indium tin oxide, are tunable. Their optical properties can be adjusted via doping

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Adewole, Murthada Oladele. "Electrically Tunable Absorption and Perfect Absorption Using Aluminum-Doped Zinc Oxide and Graphene Sandwiched in Oxides." Thesis, University of North Texas, 2018. https://digital.library.unt.edu/ark:/67531/metadc1404566/.

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Understanding the fundamental physics in light absorption and perfect light absorption is vital for device applications in detector, sensor, solar energy harvesting and imaging. In this research study, a large area fabrication of Al-doped ZnO/Al2O3/graphene/Al2O3/gold/silicon device was enabled by a spin-processable hydrophilic mono-layer graphene oxide. In contrast to the optical properties of noble metals, which cannot be tuned or changed, the permittivity of transparent metal oxides, such as Al-doped ZnO and indium tin oxide, are tunable. Their optical properties can be adjusted via doping

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33

Watson, Venroy George. "Decoration of Graphene Oxide with Silver Nanoparticles and Controlling the Silver Nanoparticle Loading on Graphene Oxide." University of Dayton / OhioLINK, 2014. http://rave.ohiolink.edu/etdc/view?acc_num=dayton1396879714.

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Liu, Hao. "Modified thermal reduction of graphene oxide." Thesis, University of Nottingham, 2014. http://eprints.nottingham.ac.uk/14024/.

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As a strictly two-dimensional carbon material, graphene has attracted great interest in recent years due to its unique mechanical, electrical and optical properties. Currently, the principal methods for mass production of graphene are focused on the solution-based chemical redox reaction. The oxidation of graphite introduces a large amount of oxygen functional groups attached onto its basal plane or edges, which makes graphene oxide (GO) sheets hydrophilic to form stable aqueous colloids. However, the raw material graphite gradually becomes an insulator during the oxidation process as part of

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Jasim, Dhifaf. "Graphene oxide derivatives for biomedical applications." Thesis, University of Manchester, 2016. https://www.research.manchester.ac.uk/portal/en/theses/graphene-oxide-derivatives-for-biomedical-applications(83c552dc-50f6-4771-95b4-d1aace0db493).html.

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Graphene-based materials (GBM) have recently generated great interest due to their unique two-dimensional (2D) carbon geometry, which confers exceptional physicochemical properties that hold great promise in many fields, including biomedicine. An understanding of how these novel 2D materials interact with the biological milieu is therefore fundamental for their development and use. Graphene oxide (GO) has been proven more biologically friendly than the highly hydrophobic pristine graphene. Therefore, the main aim of this study was to prepare well-characterised GO derivatives and test the hypot

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Li, Wei. "Composite polymer/graphite/oxide electrode systems for supercapacitors." University of Cincinnati / OhioLINK, 2015. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1439309266.

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Sanga, Nelia Abraham. "Determination of heavy metals at the electrochemically reduced graphene oxide mercury film electrode (ERGO-HgF-PGE) using adsorptive stripping voltammetry." University of Western Cape, 2020. http://hdl.handle.net/11394/7718.

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>Magister Scientiae - MSc<br>This work reports the use of a pencil graphite electrode (PGE) as inexpensive and sensitive electrochemical sensing platform fabricated by using electrochemically reduced graphene oxide (ERGO) in conjunction with an in-situ plated thin mercury film. For the first time the ERGOHgF-PGE sensor is proposed for simultaneous detection of cadmium (Cd2+), copper (Cu2+), lead (Pb2+) and zinc (Zn2+) using N-Nitroso-N-phenylhydroxylamine (cupferron) as complexing agent by square-wave adsorptive cathodic stripping voltammetry (SW-AdCSV). The technique is based on the adso

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Andersson, Fredrik. "Graphene and graphene oxide as new lubricants in industrial applications." Thesis, Uppsala universitet, Tillämpad materialvetenskap, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-264853.

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This master thesis report evaluatesthe lubricating effect of graphene (G)and graphene oxide (GO). Thesematerials have been added, in particlecondition, in Ag-based slidingcontacts and lubricating greases. Thework focuses on the tribologicalevaluation of these materials,especially friction, wear and contactresistance analyses. The friction andwear behaviors of Ag-based contactscontaining of a wide concentrationrange of graphene and graphene oxideare tested against pure silver using atest load of 2 and 10 N at a constantspeed of 5 cm/s. It was revealed thatsmall amounts of G and GO are able tosi

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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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Chau, Ngoc Do Quyen. "Can graphene oxide be a suitable platform for the complexation with nucleix acids?" Thesis, Strasbourg, 2017. http://www.theses.fr/2017STRAF059.

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L'oxyde de graphène (GO) a attiré un intérêt croissant comme vecteur potentiel pour la délivrance de gènes, en particulier pour l’inhibition de gènes spécifiques. Le but principal de ce travail est le développement de nouvelles plateformes complexant de petits ARN interférents (siRNA) et la rationalisation des interactions supramoléculaires entre la surface du GO et l'ARN double brin. L'étude s'est concentrée d'abord sur la synthèse de GO avec divers groupes oxygénés, puis sur la fonctionnalisation covalente du GO avec des amines et des polymères. De plus, j'ai étudié les facteurs qui pourraie

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Pacltová, Klára. "Ověřování vlastností betonů s nanočásticemi." Master's thesis, Vysoké učení technické v Brně. Fakulta stavební, 2019. http://www.nusl.cz/ntk/nusl-392361.

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This diploma thesis deals with the influence of addition of carbon nanoparticles on cement composites. The theoretical part of the diploma thesis is focused on the research of information about carbon nanoparticles, more precisely about carbon nanotubes and graphene oxide. There are summarized methods of dispersing carbon nanotubes and their effects on cement composites. The practical part follows the theoretical part of the research. In the first phase, the correct technique of graphene oxide dispersion was verified. Subsequently, the effects of graphene oxide on the mechanical properties of

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Alrammouz, Rouba. "Conception et réalisation d’un système de détection de gaz à faible coût sur substrat flexible." Thesis, Montpellier, 2019. http://www.theses.fr/2019MONTS134.

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Les préoccupations actuelles de protection de l’environnement et de la santé publique se focalisent sur la qualité de l’air dans l’industrie, les villes et foyers domestiques. De nos jours, les capteurs de gaz sur papier présentent un intérêt croissant au vu de leur faible coût, leur biodégradabilité, leur flexibilité, et leurs applications dans les textiles, les pansements et les emballages intelligents.L’oxyde de graphène (GO) est un dérivé du graphène qui présente des propriétés électriques, mécaniques et thermiques exceptionnelles. Ce matériau est très prometteur pour le développement de c

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Negreti, Maria Anita de Paula. "Obtenção e caracterização de compósitos poliméricos com óxido de grafeno reduzido." Universidade de São Paulo, 2016. http://www.teses.usp.br/teses/disponiveis/3/3133/tde-13032017-115009/.

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O grafeno, uma das formas alotrópicas do carbono, tem ganho grande valorização no meio científico e industrial devido às suas propriedades excepcionais. Por apresentar condutividade elétrica correspondente a do cobre e condutividade térmica, dureza e resistência superiores a todos os outros materiais existentes, faz-se necessário à busca por melhores, mais eficientes e produtivos métodos de obtenção do mesmo. Um dos métodos mais utilizados atualmente, conhecido como método de Hummers, consiste na oxidação da grafita por tratamentos ácidos e posterior redução (química ou térmica). No entanto, o

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Valim, Fernanda Cabrera Flores. "Comportamento reológico de compósitos reforçados com óxido de grafite em matriz de poli(metacrilato de metila)." Universidade de São Paulo, 2015. http://www.teses.usp.br/teses/disponiveis/3/3133/tde-12072016-114838/.

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Neste trabalho, foram obtidos compósitos poliméricos de Óxido de Grafite (GO) incorporado em Poli(metaclilato de metila) (PMMA). A obtenção do Óxido de Grafite foi realizada por dois diferentes métodos: método de Hummers modificado e método de Staudenmaier. Em seguida, foi ainda adicionada uma etapa secundária de tratamento térmico à 1000 ºC nos GOs obtidos a fim de expandir as lamelas de grafite e remover os grupos funcionais aderidos durante o ataque ácido do grafite. As cargas obtidas foram caracterizadas com o auxílio das técnicas de Difração de Raios-X (DRX), Espectroscopia Raman, Espectr

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Nesser, Hussein. "Fabrication et caractérisation des MEMS composite pour la récupération d'énergie mécanique." Thesis, Bordeaux, 2016. http://www.theses.fr/2016BORD0269/document.

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Les récents progrès dans le domaine des MEMS organiques suscitent un intérêt croissant dans la substitution de micropoutres inorganiques par des micropoutres organiques pour diverses applications. N’ayant été étudiée qu’en mode statique, la réponse électrostrictive des MEMS organiques est présentée pour la première fois en mode dynamique. L’une des originalités de ce travail est de fabriquer un micro-récupérateur d’énergie mécanique avec une approche « tout-organique ». Dans cette thèse, des matériaux nanocomposites à base d’oxyde de graphène réduit (rGO) dispersé dans du poly-dimethyl siloxan

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Moussa, Hatem. "Influence de l’association de quantum dots ZnO avec des ions Cu²+ sur leur (photo)toxicité. Nouveaux matériaux ZnO/rGO pour la photocatalyse solaire." Thesis, Université de Lorraine, 2016. http://www.theses.fr/2016LORR0036/document.

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Ces dernières années, les énormes progrès réalisés en nanotechnologie ainsi qu’en science des matériaux ont conduit à la préparation de nombreuses nouvelles nanoparticules sans réellement connaître l’ensemble des propriétés associées à leurs dimensions. La première partie de notre travail vise à évaluer les risques et les problèmes associés aux nanomatériaux, en termes de toxicité, en utilisant des nanoparticules de ZnO. Nous avons tout d’abord étudié la capacité de ces nanoparticules à générer des espèces réactives d’oxygènes (EROs) sous irradiation UV en utilisant trois types des quantum dot

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Jiang, San-Ping. "A study of teflon-bonded cobalt oxide/graphite electrodes." Thesis, City University London, 1987. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.306058.

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Shulga, Y. M., S. A. Baskakov, E. I. Knerelman, et al. "Carbon Nanomaterial Produced by Microwave Exfoliation of Graphite Oxide." Thesis, Sumy State University, 2013. http://essuir.sumdu.edu.ua/handle/123456789/35118.

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Carbon-based graphene-like material was obtained through microwave stimulated exfoliation of graph-ite oxide (GO). Properties of this material were investigated by multiple techniques including element analysis, X-ray photoelectron spectroscopy (XPS), mass-spectroscopy, infrared (IR) and Raman spectrosco-py, scanning electron microscopy (SEM) and broadband dielectric spectroscopy. Specific surface area and volume of microwave exfoliated graphite oxide (MEGO) reached 600 m2/g and 6 cm3/g, respectively. It is shown that during such explosive reduction process the sample emits CO2, CO and H2O and

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Dave, Shreya H. "Assessing graphene oxide for water desalination applications." Thesis, Massachusetts Institute of Technology, 2016. http://hdl.handle.net/1721.1/107077.

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Thesis: Ph. D., Massachusetts Institute of Technology, Department of Mechanical Engineering, 2016.<br>Cataloged from PDF version of thesis.<br>Includes bibliographical references (pages 121-133).<br>Water desalination plays a critical role in augmenting the fresh water supplies for water scarce regions. However, despite considerable improvements in system efficiencies, it still remains six to ten times more expensive than treating freshwater for drinking. As a result, the construction and operation of a desalination plant places considerable economic burden on the regions that require such an

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Thomas, Helen R. "The structure and reactivity of graphene oxide." Thesis, University of Warwick, 2015. http://wrap.warwick.ac.uk/74090/.

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Graphene oxide (GO) can provide a cost-effective route to a graphene-like material on an industrial scale, but produces an imperfect product. In order to improve the quality of the resultant graphene, unanswered questions regarding the structure and chemical reactivity of GO need to be addressed. In this thesis, chapters 1 and 2 serve to introduce the field of graphene and graphene oxide research, as well as standard characterisation techniques. Chapter 3 is concerned with investigating the validity and general applicability of a recently proposed two-component model of GO – the formation of t

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