Relevant bibliographies by topics / Oxyde de graphène

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  1. Journal articles
  2. Dissertations / Theses
  3. Books
  4. Book chapters
  5. Conference papers
  6. Reports

Academic literature on the topic 'Oxyde de graphène'

Author: Grafiati
Published: 4 June 2021
Last updated: 21 December 2024

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Journal articles on the topic "Oxyde de graphène"

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Inagaki, Michio, and Feiyu Kang. "Graphene derivatives: graphane, fluorographene, graphene oxide, graphyne and graphdiyne." J. Mater. Chem. A 2, no. 33 (2014): 13193–206. http://dx.doi.org/10.1039/c4ta01183j.

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Cao, Qiang, Xiao Geng, Huaipeng Wang, Pengjie Wang, Aaron Liu, Yucheng Lan, and Qing Peng. "A Review of Current Development of Graphene Mechanics." Crystals 8, no. 9 (September 6, 2018): 357. http://dx.doi.org/10.3390/cryst8090357.

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Graphene, a two-dimensional carbon in honeycomb crystal with single-atom thickness, possesses extraordinary properties and fascinating applications. Graphene mechanics is very important, as it relates to the integrity and various nanomechanical behaviors including flexing, moving, rotating, vibrating, and even twisting of graphene. The relationship between the strain and stress plays an essential role in graphene mechanics. Strain can dramatically influence the electronic and optical properties, and could be utilized to engineering those properties. Furthermore, graphene with specific kinds of defects exhibit mechanical enhancements and thus the electronic enhancements. In this short review, we focus on the current development of graphene mechanics, including tension and compression, fracture, shearing, bending, friction, and dynamics properties of graphene from both experiments and numerical simulations. We also touch graphene derivatives, including graphane, graphone, graphyne, fluorographene, and graphene oxide, which carve some fancy mechanical properties out from graphene. Our review summarizes the current achievements of graphene mechanics, and then shows the future prospects.
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Strankowski, Michał, Damian Włodarczyk, Łukasz Piszczyk, and Justyna Strankowska. "Polyurethane Nanocomposites Containing Reduced Graphene Oxide, FTIR, Raman, and XRD Studies." Journal of Spectroscopy 2016 (2016): 1–6. http://dx.doi.org/10.1155/2016/7520741.

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Recently, graphene and other graphene-based materials have become an essential part of composite science and technology. Their unique properties are not only restricted to graphene but also shared with derivative compounds like graphene oxide, reduced graphene oxide, functionalized graphene, and so forth. One of the most structurally important materials, graphene oxide (GO), is prepared by the oxidation of graphite. Though removal of the oxide groups can create vacancies and structural defects, reduced graphene oxide (rGO) is used in composites as effective filler similar to GO. Authors developed a new polyurethane nanocomposite using a derivative of grapheme, thermally reduced graphene oxide (rGO), to modify the matrix of polyurethane elastomers, by rGO.
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Banerjee, Arghya Narayan. "Graphene and its derivatives as biomedical materials: future prospects and challenges." Interface Focus 8, no. 3 (April 20, 2018): 20170056. http://dx.doi.org/10.1098/rsfs.2017.0056.

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Graphene and its derivatives possess some intriguing properties, which generates tremendous interests in various fields, including biomedicine. The biomedical applications of graphene-based nanomaterials have attracted great interests over the last decade, and several groups have started working on this field around the globe. Because of the excellent biocompatibility, solubility and selectivity, graphene and its derivatives have shown great potential as biosensing and bio-imaging materials. Also, due to some unique physico-chemical properties of graphene and its derivatives, such as large surface area, high purity, good bio-functionalizability, easy solubility, high drug loading capacity, capability of easy cell membrane penetration, etc., graphene-based nanomaterials become promising candidates for bio-delivery carriers. Besides, graphene and its derivatives have also shown interesting applications in the fields of cell-culture, cell-growth and tissue engineering. In this article, a comprehensive review on the applications of graphene and its derivatives as biomedical materials has been presented. The unique properties of graphene and its derivatives (such as graphene oxide, reduced graphene oxide, graphane, graphone, graphyne, graphdiyne, fluorographene and their doped versions) have been discussed, followed by discussions on the recent efforts on the applications of graphene and its derivatives in biosensing, bio-imaging, drug delivery and therapy, cell culture, tissue engineering and cell growth. Also, the challenges involved in the use of graphene and its derivatives as biomedical materials are discussed briefly, followed by the future perspectives of the use of graphene-based nanomaterials in bio-applications. The review will provide an outlook to the applications of graphene and its derivatives, and may open up new horizons to inspire broader interests across various disciplines.
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Xiao, Zhen Hui, Shui Sheng Wu, Yan Lin Sun, Yu Lin Zhao, and Ya Ming Wang. "Microwave-Hydrothermal Synthesis and Characterization of Graphene." Advanced Materials Research 602-604 (December 2012): 917–20. http://dx.doi.org/10.4028/www.scientific.net/amr.602-604.917.

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Graphene was synthesized by microwave-hydrothermal chemical reduction of graphite oxide using hydrazine hydrate as the reducing agent. Graphene was characterized using X-ray diffraction, UV-visible spectrum, FT-IR spectrum and scanning electron microscopy. Results indicated that the as-prepared graphene was wrinkled and comprised fewer graphenes with a highly crystalline structure.
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J, Monica, and Divyasankari G. "Experimental Study on Green Concrete using Graphene." International Journal of Innovative Research in Advanced Engineering 10, no. 07 (July 31, 2023): 486–89. http://dx.doi.org/10.26562/ijirae.2023.v1007.07.

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The paper considers methods for concrete modification using low-layer graphene and grapheme oxide. It was found that graphene oxide and low-layer graphene obtained by liquid-phase shear exfoliation significantly increase the strength of concrete. In our opinion, low-layer graphene has better prospects since it is cheaper and its production technology is environmentally friendly. The viability and future of graphene largely depends on the availability of such a method that allows mass production of high-quality graphene at an affordable price. In this regard, liquid- phase separation of graphite with the formation of low-layer graphene, which can be used to modify concrete, turned out to be a competitive solution. The following main tasks were formulated in order to solve the organizational problems of low- layer grapheme industrial production: reducing the concentration of low-layer grapheme in concrete; increasing the concentration of low-layer graphene in suspension; developing an industrial technology for the production of concentrate with a high content of low- layer graphene; conducting full-scale experimental studies to determine the optimal concentration of low-layer graphene in concrete.
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Wang, Xuan Lun, and Wei Jiu Huang. "Fabrication and Characterization of Graphene/Polyimide Nanocomposites." Advanced Materials Research 785-786 (September 2013): 138–44. http://dx.doi.org/10.4028/www.scientific.net/amr.785-786.138.

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Graphene/polyimide nanocomposites with different weight loadings were prepared by a solution compounding technique. Graphene was synthesized from graphite oxide that was fabricated by the Hummers method. X-ray diffraction (XRD), ultraviolet visible (UV-vis) spectra and simultaneous thermal analysis were used for the microstructure analysis of the graphenes. Graphenes with single layer structure were synthesized successfully and had good solubility in water or other polar solvents due to a few functional groups on the graphene carbons. Graphenes have good thermal stability. Mechanical and tribological properties were studied for the graphene/polyimide composites. The composites have excellent strength and toughness with very small graphene loading level and the addition of graphene decreased the friction coefficient and wear rate of the composites.
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Li, Jinghao, Qiangu Yan, Xuefeng Zhang, Jilei Zhang, and Zhiyong Cai. "Efficient Conversion of Lignin Waste to High Value Bio-Graphene Oxide Nanomaterials." Polymers 11, no. 4 (April 4, 2019): 623. http://dx.doi.org/10.3390/polym11040623.

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Lignin graphene oxide was oxidized after Kraft lignin was graphitized by thermal catalytic conversion. The reduced lignin graphene oxide was derived from lignin graphene oxide through thermal reduction treatment. These Kraft lignin, lignin graphite, lignin graphene oxide, and reduced lignin graphene oxide were characterized by scanning electron microscopy, raman microscopy, high-resolution transmission electron microscopy, X-ray diffraction, Fourier transform infrared spectroscopy, atomic force microscopy and thermogravimetric analysis. The results showed lignin graphite converted from Kraft lignin had fewer layers with smaller lateral size than natural graphite. Moreover, lignin graphene oxide was successfully produced from lignin graphite by an oxidation reaction with an hour-long reaction time, which has remarkably shorter reaction time than that of graphene oxide made from natural graphite. Meanwhile, this lignin-derived graphene oxide had the same XRD, FTIR and Raman peaks as graphene oxide oxidized from natural graphite. The SEM, TEM, and AFM images showed that this lignin graphene oxide with 1–3 average layers has a smaller lateral size than that of graphene oxide made from natural graphite. Moreover, the lignin graphene oxide can be reduced to reduced lignin graphene oxide to fabricate graphene-based aerogel, wire, and film for some potential applications.
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Wang, Yachao, and Jiangping Zhao. "Effect of Graphene on Flame Retardancy of Graphite Doped Intumescent Flame Retardant (IFR) Coatings: Synergy or Antagonism." Coatings 9, no. 2 (February 3, 2019): 94. http://dx.doi.org/10.3390/coatings9020094.

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A comparative study between graphene and modified graphene oxide (mGO) on the flame retardancy of graphite doped intumescent flame retardant (IFR) coatings is preliminarily investigated by cone calorimeter (CC), XRD, and SEM, with the final aim of clarifying the interactions between different graphenes and graphite doped coatings (polyester resin-ammonium polyphosphate-urea-pentaerythritol). The CC results determine that graphene exerts an obviously antagonistic effect on flame resistance, evidenced by the increased peak heat release rate (p-HRR) of 56.9 kW·m−2 for SD8+graphene (sample coating contains graphite with a particle size of 8 μm and 0.5 wt.% graphene as dopant), which increased by 80.6% compared with SD8 (coating contains graphite with a particle size of 8 μm); substitution with graphene or mGO imparts an acceleration of fire growth, because graphene inertness improves the viscosity of melting system, evidenced by the cracked appearance and porous structure of SD8+graphene. However, the higher reactivity of mGO favors the combustion; the barrier effect inhibits the transfer of mass and heat simultaneously, leading to a slight influence on flame retarding efficiency.
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Abaszade, R. G. "Synthesis and analysis of flakes graphene oxide." Journal of Optoelectronic and Biomedical Materials 14, no. 3 (July 2022): 107–14. http://dx.doi.org/10.15251/jobm.2022.143.107.

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The presented article is devoted to the synthesis and analysis of flakes graphene oxide obtained by the Hammers method. The synthesized flakes graphene oxide was studied using SEM, EDX, X-ray diffraction, Raman spectroscopy, element analysis, temperature dependent of resistance and IR spectroscopy. As a result of calculating the results of X-ray analysis according to the Debye-Scherer’s formula, the thickness of graphite flakes was about 12,9nm and the number of layers was 38. The result of the Raman analysis show that high quality flakes grapheme oxide was obtained. Based on the result of elementary analysis of grapheme oxide mass, the C/O ratio was determined to be 1,42. The grapheme layers inside the sample were 3,31nm thick and 14,8nm long by scanning electron microscope. The temperature variation of the resistance was determined. IR spectroscopy shows the results of the absorption of electromagnetic radiation in the infrared range by atomic groups of reduced grapheme oxide and the excitation of the molecule by light quanta. When a molecule is irradiated with infrared radiation, it is shown that only quantum absorption quantities are formed according to the frequencies of the molecules.
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Dissertations / Theses on the topic "Oxyde de graphène"

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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 mieux répartie. Le développement de ces systèmes de récupération des micro-sources d’énergie passe par de faibles coûts avec substrat souple (papier,polymère) et des matériaux facilement exploitables. Après la récupération de l’énergie, il est nécessaire pour les systèmes autonomes de stocker l'électricité.Dans cet objectif, les supercondensateurs sont les candidats idéaux. En effet, Le principal avantage des supercondensateurs par rapport aux batteries est leur haute densité de puissance (la collecte rapide de l’énergie) ainsi qu'une longue durée de vie. La thèse concerne donc la fabrication d’un supercondensateur et in fine le couplage avec une cellule solaire. Les travaux concernent spécifiquement l’étude de l'oxyde de graphène (GO) synthétisé par la méthode Hummers et Marcano, de sa réduction en oxyde de graphène réduit (RGO) par les voies chimique et électrochimique et de réalisation du supercondensateur. Dans ce projet, les propriétés de l'oxyde de graphène réduit (RGO) seront optimisées lors de l'étape de réduction et le matériau sera mis en forme dans une structure sandwich (RGO/ électrolyte /RGO) ou interdigité Mots clés: Graphène,supercondensateur, oxyde de graphène, micro-source d'énergie
The use of micro-power generation energy is a promising concept that consists in harvesting low and diffuse energy sources present in our environment for the supply of autonomous systems. The growing number of new miniaturized and communicating devices in civil and military fields should accentuate the phenomenon of energy dependence and open up new markets.Among possible sources of renewable energy, solar energy is the most promising source because it is potentially the most powerful and best distributed. The development of these micro-energy recovery systems involves low costs with flexible substrate (paper, polymer) and easily exploitable materials. After energy recovery, it is necessary for the autonomous systems to store electricity.For this purpose, supercapacitors are ideal candidates. Indeed, the main advantage of supercapacitors over batteries is their high power density (fast energy collection) as well as a long cycle life. The thesis concerns the manufacture of a supercapacitor and ultimately coupling with a solar cell. The work specifically concerns the study of graphene oxide (GO) synthesized by the Hummers and Marcano methods, its reduction in reduced graphene oxide (RGO) by chemical and electrochemical routes and the realization of supercapacitor. In this project, the properties of reduced graphene oxide (RGO) will be optimized during the reduction step and the material will be shaped into a sandwich structure (RGO / electrolyte / RGO) or interdigitated.Keywords: Graphene,supercapacitor, graphene oxide,energy micro-source
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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 rapport à la majorité des adsorbants connus à base de carbone. En outre la fonctionnalisation de GO avec l'aminosilicate mésoporeuse (SiO2NH2) conduit à l'obtention d'un adsorbant efficace et rapide des colorants organiques cationiques (MB, RhB, MV). En plus nous avons prouvé que la fonctionnalisation du graphène (EEG), en utilisant les sous-unités de surfactant POM, a montré que ce type de matériau hybride organique-inorganique est très stable et présente des propriétés électriques intéressantes pouvant être utilisées dans la production de supercondensateurs
Scientific purpose of this doctoral dissertation is synthesis of functionalized two-dimensional materials (graphene and graphene oxide) and their comprehensive physicochemical characterization, with particular emphasis on adsorption and energy storage properties. We could demonstrate that covalent modification of graphene oxide (GO) with an organic polymer (BPEI) very favorably affects the efficiency of the adsorption process. The maximum adsorption capacity (qmax) values for heavy metal ions significantly favour this material in comparison to the majority of known carbon adsorbents. Moreover, functionalization of GO with mesoporous aminosilica (SiO2NH2) leads to obtaining an efficient and rapid adsorbent of organic cationic dyes (MB, RhB, MV). ln addition we proved that the functionalization of graphene (EEG) using the POM-surfactant su bu nits proved that this type of organic-inorganic hybrids material is very stable and have interesting electrical properties with potential application in the production of supercapacitors
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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 de graphène ont été synthétisés pour des applications potentielles dans l'électronique, le stockage d'énergie, la catalyse et la sorption, le stockage, la séparation et la détection de gaz ainsi que dans le domaine biomédical. Les dendrimères sont des macromolécules particulièrement intéressantes pour un très grand nombre d'applications dans des domaines extrêmement variés. Cet intérêt réside essentiellement dans leurs propriétés de coopérativité et de multivalence, ainsi que dans leur très haute capacité d'encapsulation ou de fixation de petites molécules, et ceci dans un volume de taille nanométrique. Cette caractéristique structurale est la conséquence de leur architecture unique ramifiée contenant un cœur central et possédant de nombreuses fonctions périphériques. Les dendrimères sont donc des outils très intéressants pour la délivrance de médicaments et d'acides nucléiques. Dans ce travail nous allons développer des approches simples pour décorer la surface de l’oxyde de graphène avec des dendrons et dendrimères phosphorés pour des applications en oncologie. Dans un premier temps on va effectuer la synthèse des dendrimères phosphorés classiques, et des dendrons AB5, ensuite le greffage des différents monomères sur leur surface. En parallèle la préparation de l’oxyde de graphène (GO) ainsi que la modification de la surface de GO par différentes méthodes a été effectué, et finalement le greffage des différents dendrons sur la plateforme de l’oxyde de graphène a permis d'obtenir de nouveaux matériaux hybrides qui seront testés biologiquement
Graphene, a monolayer of carbon atoms densely packed in a honeycomb lattice, was first isolated in 2004. In recent years, research on graphene and its derivatives has generated considerable interest in a wide range of research activities thanks to its interesting properties. The easiest and most versatile way to obtain graphene-based nanocomposites is to oxidize natural graphite to obtain graphene oxide (GO), a material with a surface rich in modifiable chemical functions. Graphene oxide nanocomposites have been synthesized for potential applications in electronics, energy storage, catalysis and sorption, gas storage, separation and detection as well as in the biomedical field. Dendrimers are particularly advantageous macromolecules for a very large number of applications in extremely varied fields. This interest resides essentially in their properties of cooperativity and multivalence, as well as in their very high capacity for encapsulation or fixing of small molecules, and this in a volume of nanometric size. This structural characteristic is the consequence of their unique branched architecture containing a central core and having many peripheral functions. Dendrimers are very interesting tools for the delivery of drugs and nucleic acids. In this work we will develop simple approaches to decorate the surface of graphene oxide with phosphorus dondron and dendrimers in order to create new hybrid materials with new properties. First, the synthesis of classical phosphorus dendrimers and of AB5 dendrons will be carried out, followed by the grafting of the different monomers on their surface. In parallel the preparation of graphene oxide (GO) as well as the modification of the GO surface with different methods will be carried out, and finally the grafting of the different dendrons on the platform of graphene oxide will afford new hybrid materials that will be biologically tested
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Al-Nafiey, Amer Khudair Hussien. "Reduced graphene oxide-based nanocomposites : synthesis, characterization and applications." Thesis, Lille 1, 2016. http://www.theses.fr/2016LIL10009/document.

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Nous avons synthétisé avec succès ces nano-composés (rGO/Arg-Ag NPs, rGO-Ni NPs and rGO-Co3O4NPs) et les avons caractérisés par de nombreuses techniques, XPS, SEM, TEM, FTIR, Raman, UV-Vis et TGA. Les analyses montrent que ces nano-composés à base de graphène ont des propriétés excellentes et une grande stabilité. Utilisés comme catalyseurs dans des applications environnementales, ils réduisent efficacement le 4-nitrophenol en 4-aminophenol ainsi que les colorants à forte adsorption et le chrome (VI) présents dans les eaux usées
We successfully obtained these nanocomposites (rGO/Arg-Ag NPs, rGO-Ni NPs and rGO-Co3O4NPs).The resulting rGO-based nanocomposites were characterized by a variety of different techniques, including XPS, SEM, TEM, FTIR, Raman, UV-Vis and TGA. These analysis shows that these graphene-based nanocomposites have excellent properties and stability. The rGO-based nanocomposites, applied as a catalyst in environmental applications and shows good catalytic performance for reduction of 4nitrophenol to 4aminophenol and high adsorption dyes and Cr (VI) from wastewater
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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 ce travail a été consacrée pour l’amélioration de l’activité photocatalytique du TiO2 sous lumière UV et visible. Par conséquent, les nanofibres composites de rGO/TiO2, BN/TiO2 et BN-Ag/TiO2 ont été élaborées en utilisant la technique d'électrofilage (electrospinning). La deuxième partie porte sur le ZnO, ainsi que les nanotubes multi co-centriques de ZnO/ZnAl2O4 et les nanotubes de ZnO dopés Al2O3 qui ont été synthétisés en combinant les deux techniques : dépôt de couche atomique (ALD) et electrospinning. Les propriétés morphologiques, structurelles et optiques de toutes les nanostructures synthétisées ont été étudiées par différentes techniques de caractérisations. Les résultats ont montré que les propriétés chimiques et physiques ont un effet très important sur les propriétés photocatalytiques des matériaux synthétisés. En outre, il a été constaté que l'effet de dopage conduit à une séparation de charge efficace dans le photocatalyseur, ce qui rend l’activité photocatalytique plus efficace. De plus, le méthyle orange et le bleu de méthylène ont été utilisés comme modèle de référence. Une amélioration significative et une stabilité à long terme de l’activité photocatalytique ont été observées avec les matériaux dopés comparés aux matériaux non-dopés sous lumière UV et visible. Des tests antibactériens contre Escherichia coli ont été également effectués; les résultats indiquent que BN-Ag/TiO2 présente à la fois des propriétés photocatalytiques intéressantes pour la dégradation des composés organiques et pour l'élimination des bactéries
Nowadays, industrial toxic chemicals are still not properly treated and these contaminants may directly impact the safety of drinking water. Photocatalysis “a green technology” is an effective and economical approach and plays an important role in solar energy conversion and degradation of organic pollutants. This thesis manuscript reports on developing advanced materials (based on TiO2 and ZnO) being capable of exploiting renewable solar energy for solving the environmental pollution problems. A part of this work was dedicated to improve the UV and visible light TiO2 photoresponse. Therefore, rGO/TiO2, BN/TiO2 and BN-Ag/TiO2 composties nanofibers were successfully elaborated using the electrospinning technique. The second part focused on ZnO. Novel structures of ZnO/ZnAl2O4 multi co-centric nanotubes and Al2O3 doped ZnO nanotubes were designed by combining the two techniques of atomic layer deposition (ALD) and electrospinning. The morphological, structural and optical properties of all synthesized nanostructures were investigated by several characterization techniques. The results show that the chemical and physical properties have a high impact on the photocatalytic properties of the synthesized materials. Moreover, it was found that the doping effect lead to a more efficient charge separation in the photocatalyst, which is an advantage for photocatalytic activities. In addition, methyl orange and methylene blue were used as model reference. A significant enhancement and a long-term stability in the photocatalytic activity were observed with the doped materials compared to the non-doped ones under both UV and visible light. Antibacterial tests against Escherichia coli have also been performed; the results indicate that BN-Ag/TiO2 present interesting photocatalytic properties for both organic compound degradation and bacterial removal
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Kaminska, Izabela. "Préparation et applications de plateformes à base de nanaoparticules d’or et de graphène." Thesis, Lille 1, 2014. http://www.theses.fr/2014LIL10003/document.

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Dans ce travail de thèse, de nouvelles méthodes de préparation d’interfaces recouvertes de nanoparticules d’or (Au NPs) et/ou d’oxyde de graphène réduit (rGO) ont été développées. La méthode de dépôt des nanoparticules d’or repose sur la technique dite « three phase junction » ou « jonction à trois phases ». Différentes conditions de dépôt par voltampérométrie et chronoampérométrie ont été utilisées pour optimiser la taille et la forme ainsi que la stabilité de ces nanostructures sur l’électrode. Les propriétés catalytiques des électrodes modifiées par les nanostructures métalliques ainsi obtenues ont été exploitées pour l’oxydation du glucose et la réduction d’oxygène. Ces interfaces ont montré une activité catalytique comparable à celle décrite dans la littérature pour d’autres électrodes. Ces interfaces ont été aussi investiguées comme substrats pour la spectroscopie SERS et pour la microscopie en fluorescence. La deuxième partie de la thèse a porté sur la mise au point d’une méthode simple pour la réduction et la fonctionnalisation de feuillets de GO. Deux molécules aromatiques (la dopamine et le tétrathiafulvalène, TTF) ont été utilisées pour la préparation de matériaux nanocomposites : rGO/dopamine et rGO/TTF. Les nanocomposites obtenus ont été caractérisées par différentes techniques d’analyse de surfaces et mesures électrochimiques. Les applications potentielles de ces nanocomposites ont été démontrées dans le domaine de capteurs et interrupteurs chimiques. Finalement, l’influence des Au NPs et/ou de rGO ainsi synthétisées sur les propriétés de fluorescence de biomolécules a été investiguée sur des interfaces modifiées par ces nanoobjets
In this thesis, new methods for the preparation of interfaces covered with gold nanoparticles (AuNPs) and/or reduced graphene oxide (rGO) based materials are introduced. An electrode|aqueous electrolyte|gold precursor solution in toluene three-phase junction was applied for AuNPs electrodeposition. Nanoparticles obtained in various conditions, with cyclic voltammetry or chronoamperometry, were investigated to find optimal conditions for their electrodeposition. To characterize the properties of AuNPs deposited at the electrode surface, electrochemical, spectroscopic and microscopic methods were employed. These modified surfaces were applied as a new catalytic and bioelectrocatalytic material, as well as sensing platform for surface-enhanced Raman spectroscopy and fluorescence microscopy. This allowed to demonstrate some potential applications of AuNPs deposited at the three-phase junction. In the following part, a new and simple method for GO reduction and simultaneous functionalization was proposed. Selected aromatic molecules were employed as reducing agents in reactions carried out under mild conditions. To characterize the new composites, electrochemical, spectroscopic and microscopic techniques were used. These composites were also investigated as potential substrates for sensors and (electro)chemical switches. Finally, AuNPs and/or rGO were applied as new sensors in fluorescence microscopy. Using these materials separately and afterwards hybrid coatings containing both structures, allowed exploring interactions between them. This strategy was also applied to explore fluorescence properties of a selected biomolecule and the influence of both materials on it
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Wang, Qi. "Carbon-based materials : preparation, functionalization and applications." Thesis, Lille 1, 2013. http://www.theses.fr/2013LIL10156/document.

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Le graphène et ses dérivées ont suscité un grand intérêt au fil des années en raison de leurs propriétés physiques et chimiques exceptionnelles. Pour l'intégration du graphène dans des dispositifs électrochimiques, il est essentiel d'avoir une technique simple, reproductible et contrôlable afin de produire des feuillets de graphène de bonne qualité sur des grandes surfaces. Dans cette optique, l'utilisation d'oxyde de graphène réduit chimiquement (rGO) plutôt que le graphène produit par la technique CVD représente une alternative très prometteuse. Dans cette thèse, nous avons développé différentes approches simples, respectueuses de l'environnement, et contrôlables pour la réduction chimique de l'oxyde de graphène en rGO ainsi que la fonctionnalisation simultanée de la matrice de rGO formée par les agents de réduction utilisés. Les divers agents réducteurs utilisés sont : la tyrosine, l'acide 4-aminophénylboronique (APBA), la dopamine portant une fonction alcyne, et nanoparticules de diamant (ND). Les matrices de rGO ainsi préparées ont été caractérisées par différentes méthodes telles que : XPS, AFM, MEB, FTIR, Raman, UV/Vis et mesures électrochimiques. Les matrices de rGO, déposées sur des électrodes de carbone vitreux (GC), ont ensuite été utilisées pour des applications électrochimiques pour la détection du peroxyde d'hydrogène (en absence d’enzyme), du glucose, et de la L-dopa et carbidopa simultanément. Finalement, les nanocomposites de rGO/NDs ont été utilisés avec succès comme électrodes dans des supercondensateurs, et ont montré une capacité spécifique de 186 F g-1 et une excellente stabilité
Graphene and its derivatives have attracted tremendous research interest over the years due to their exceptional physical and chemical properties. For the integration of graphene into electrochemical devices, it is essential to have a simple, reproducible and controllable technique to produce high quality graphene sheets on large surfaces. In this respect, the use of chemically derived reduced graphene oxide (rGO) rather than CVD graphene is a promising approach. In this thesis, we have developed simple, environmentally friendly, and controllable approaches for the chemical reduction of graphene oxide to rGO and the simultaneous functionalization of the resulting rGO matrix with the used reducing agents. These techniques are based on the use of tyrosine, 4-aminophenyl boronic acid (APBA), alkynyl-modified dopamine, and diamond nanoparticles (ND) as reducing agents. The robustness of the developed derivatization schemes was evaluated by the post-functionalization of alkynyl-dopamine/rGO with thiolated molecules via a photochemical “click” reaction.The resulting rGO matrices were characterized by a variety of different techniques, including XPS, AFM, SEM, FTIR, Raman, UV/Vis, and electrochemical measurements. The rGO matrices, deposited on glassy carbon (GC) electrodes, have been further used for electrochemical based applications for nonenzymatic detection of hydrogen peroxide, glucose, and simultaneously L-dopa and carbidopa. Furthermore, rGO/NDs nanocomposites have been successfully used as electrode in supercapacitors and exhibited a specific capacitance of 186 F g-1 and excellent long term stability
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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 propriétés physico-chimiques (conductivité, viscosité) dans des mélanges binaires LIP/eau. Après avoir déterminé les formulations permettant d’atteindre les propriétés de transport optimales, les capacitances spécifiques de la Pani/HCl dans ces milieux LIP ont été déterminées et nous avons montré que les performances de dispositifs symétriques sont améliorées en capacitance, énergie et en puissance (400 F/g, 7 Wh.kg-1 et 4 kW.kg-1 pour les valeurs les plus élevées) par rapport à un milieu H2SO4 1M. Ces milieux LIP ont également été utilisés comme milieu de synthèse de la Pani. Nous avons ainsi montré que la nature des LIP, qui sont des milieux nanostructurants, pouvait modifier les propriétés électroniques, morphologiques et thermiques des Pani. Un optimum de conductivité électronique de la Pani (22 S/cm) a été atteint avec une synthèse réalisée dans le mélange binaire [Imi][HSO4]/eau 70/30 (pourcentage massique) générant une morphologie fibrillaire et une bonne cyclabilité (93% de rétention de capacitance sur 1000 cycles dans H2SO4 1M. Des valeurs de près de 400 F/g ont été obtenues dans le mélange [Pyrr][HSO4]/eau 41/59 optimisé. Dans le cas de la synthèse de la Pani réalisée dans [Pyrr][PTS]/eau, un gain en stabilité thermique (360°C) est obtenu grâce au dopage par l’anion PTS-. Finalement, une étude exploratoire sur la préparation de composites Pani/graphène et Pani/oxyde de graphène a été réalisée. Les synthèses des nanocomposites ont été effectuées dans les mélanges LIP/eau. L’optimisation de la composition du composite a été étudiée et indique que des rapports massiques de graphène ou oxyde de graphène d’environ 15% permettent d’atteindre des performances de stockage prometteuses et exaltées par rapport à celles obtenues pour des Pani sans graphène
The work carried out during this PhD thesis is based on the preparation of conducting polymers such as polyaniline (Pani) and their composites associated with graphene for use as electrode materials for supercapacitors application. This work was first dedicated to the synthesis of new protic ionic liquids (PILs) combining pyrrolidinium (Pyrr+) or imidazolium (Imi+) cations with p-toluene sulfonate (PTS-), hydrogen sulfate (HSO4-) or (+)-camphor-10-sulfonate (Cs-) anion, and the study of their physico-chemicals properties (conductivity, viscosity) in binary mixtures PILs/water. After determining the formulations needed to achieve the optimum of transport properties, the specific capacitance of Pani/HCl in these PILs medium was determined, and we have shown that the performance of symmetrical devices are improved in capacitance, specific energy and specific power (400F/g, 7Wh/kg and 4kW/kg for the higher values) in comparison to those obtained in a H2SO4 1M medium. These PILs mediums were also used as a synthesis medium of Pani. We have shown that the nature of PILs, acting as soft template, could change the electronic, morphological and thermal properties of Pani. An optimum of electronic conductivity of Pani (22 S/cm) was obtained with a synthesis realized in the binary mixture [Imi][HSO4]/water 70/30 generating a fibrillar morphology and a good cyclability (93% capacitance retention over 1000 cycles in H2SO4 1M at 2 A/g). For Pani synthesis in [Pyrr][PTS]/water, a thermal stability gain (360 °C) is obtained thanks to a PTS- doped Pani. Finally, a preliminary study on the preparation of composite Pani/graphene and Pani/graphene oxide was performed. The syntheses of nanocomposites were realized in PILs/water mixtures. The optimization of the composition of the Pani nanocomposites was studied and it was found that a mass ratio of about 15% in weight of graphene or graphene oxide enables to obtain promising nanomaterials with higher electrochemical performances compared with pristine Pani
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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’élaboration de matériau carboné biosourcé. La lignine a pu être transformée en divers matériaux carbonés tels que des nanofibres de carbone, des tresses de nanofibres de carbone, ou encore des objets 3D composites carbonisés. Ces matériaux ont été obtenus à partir de techniques innovantes que sont l’électrofilage et l’impression 3D. Le tressage des nanofibres de carbone ex-lignine a permis d’évaluer les propriétés mécaniques des fibres de carbone. Les propriétés électrochimiques des tresses de nanofibres de carbone ex-lignine sont apparues intéressantes pour une utilisation potentielle en tant que microélectrodes. La microstructure faiblement organisée du carbone issue de la lignine a pu être améliorée. Un traitement thermique de graphitisation ou un ajout de nanocharges carbonées ont contribué à cette amélioration. Les propriétés mécaniques, structurales et de conductivité électrique des nanofibres nanocomposites ont permis de définir l’influence de l’oxyde de graphène sur la lignine. Un effet composite entre ces deux constituants a pu être observé. L’impression 3D d’encres composites à base de lignine et d’oxyde de graphène a pu être rapportée pour la première fois afin d’élaborer des objets 3D carbonisés denses, organisés et conducteurs d’électricité
This work is devoted to the preparation of new bio-based carbon materials. Carbon materials, such as carbon fibers used in composites, are mainly obtained from a petroleum precursor. These precursors are expensive and not compatible with a sustainable industry. The use of a bio-based precursor available in large quantities such as lignin makes it possible to overcome limitations of petroleum based precursors. The aromatic molecular structure and high carbon content of lignin make it an ideal candidate for the production of bio-based carbon material. Lignin could be transformed into various materials such as carbon nanofibers, twisted carbon nanofibers, or carbonized composite 3D structures. These materials have been obtained from innovative techniques such as electrospinning and 3D printing. Twisting of the lignin-based-carbon nanofibers allowed for measurements of their mechanical strength. The electrochemical properties of the lignin-based twisted carbon nanofibers are interesting for potential microelectrode applications. The low microstructural order of the carbon from the carbonized lignin has been improved. Graphitization treatment or addition of carbon nanofillers contributed to this improvement. The mechanical, structural and electrical properties of nanocomposite carbon nanofibers illustrate the influence of graphene oxide on lignin. A composite effect between these two components has been observed. The 3D printing of composite inks based on lignin and graphene oxide has been reported for the first time in order to elaborate dense, organized and electrically conductive 3D carbonized structures
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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 temps, la méthode d'élaboration et la teneur en fullerène fonctionnalisé ont été optimisées conduisant ainsi à l'élaboration de nanomatériaux révélant des propriétés photocatalytiques améliorées par rapport au TiO2 nanotube seul. Une corrélation entre les propriétés texturales, les propriétés photoélectriques et la constante de vitesse de dégradation de l'AF a été établie afin d'élucider les causes de l'amélioration de l'activité photocatalytique. Dans un second temps, une étude détaillée portant sur l'élaboration d'une nouvelle génération de nanocomposites combinant nanotubes de TiO2 et oxyde de graphène (OG) a été menée. Le degré de réduction de l'oxyde de graphène influence fortement l'activité photocatalytique. Ainsi, l'addition d'OG ou OG réduit aux nanotubes de TiO2 influence positivement les performances intrinsèques en photodégradation de l'acide formique en facilitant le transfert de photoélectrons de la bande de conduction du TiO2 vers l'oxyde de graphène. Finalement, l'étude des matériaux composites combinant l'oxyde de graphène et diverses compositions anatase/rutile a permis de mettre en évidence une synergie entre le OG et les deux phases TiO2
Two main objectives were achieved in the present work. The first objective concerns the elaboration of nanohybrid materials formed by combining titanium dioxide (in spherical or tubular form) with carbon allotropes (functionalized fullerene or graphene). The second objective consists in evaluating these different nanomaterials in the photodegradation of formic acid (FA) under UV irradiation. A beneficial effect of the different carbon allotropes on the photocatalytic activity of the resulting nanohybrids was observed and ascribed to an increased lifetime of photogenerated electron-hole pairs. In a first step, the elaboration method of functionalized fullerenes and their content were optimized leading to the development of nanomaterials showing improved photocatalytic properties compared to TiO2 nanotube alone. Textural properties, photoelectric properties and the FA degradation rate constant were correlated in order to determine the reasons for the photocatalytic activity improvement. In a second step, a detailed study about the development of a new generation of nanocomposites combining TiO2 nanotubes and graphene oxide (GO) was carried out. The degree of reduction of GO strongly influences the photocatalytic activity. Thus, the addition of reduced GO or GO to TiO2 nanotubes improves the intrinsic photodegradation performance of formic acid by facilitating the transfer of photoelectrons from the conduction band of TiO2 to graphene oxide. Finally, composite materials combining graphene oxide and various anatase/rutile compositions were analyzed showing a synergy between GO and the two TiO2 phases
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Books on the topic "Oxyde de graphène"

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Dimiev, Ayrat M., and Siegfried Eigler, eds. Graphene Oxide. Chichester, UK: John Wiley & Sons, Ltd, 2016. http://dx.doi.org/10.1002/9781119069447.

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Gao, Wei, ed. Graphene Oxide. Cham: Springer International Publishing, 2015. http://dx.doi.org/10.1007/978-3-319-15500-5.

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Jain, Pallavi, Chandrabhan Verma, Anirudh Pratap Singh Raman, Kamlesh Kumari, and Prashant Singh. Biosensors Based on Graphene, Graphene Oxide and Graphynes for Early Detection of Cancer. Boca Raton: CRC Press, 2024. http://dx.doi.org/10.1201/9781003491361.

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Zhao, Jijun, Lizhao Liu, and Fen Li. Graphene Oxide: Physics and Applications. Berlin, Heidelberg: Springer Berlin Heidelberg, 2015. http://dx.doi.org/10.1007/978-3-662-44829-8.

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Pendolino, Flavio, and Nerina Armata. Graphene Oxide in Environmental Remediation Process. Cham: Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-60429-9.

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Gao, Zhenghan. Phase Diagrams of Water Confined by Graphene and Graphene Oxide. [New York, N.Y.?]: [publisher not identified], 2018.

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Ezema, Fabian Ifeanyichukwu, Tingkai Zhao, and Ishaq Ahmad. Graphene Oxide in Enhancing Energy Storage Devices. Boca Raton: CRC Press, 2022. http://dx.doi.org/10.1201/9781003215196.

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Jean, Corbin, and United States. National Aeronautics and Space Administration., eds. Synthesis and thermal stability of graphite oxide-like materials. [Washington, D.C: National Aeronautics and Space Administration, 1997.

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Hameed, Abdulrahman Shahul. Phosphate Based Cathodes and Reduced Graphene Oxide Composite Anodes for Energy Storage Applications. Singapore: Springer Singapore, 2016. http://dx.doi.org/10.1007/978-981-10-2302-6.

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Fusaro, Robert L. Sputtered cadmium oxide as a surface pretreatment for graphite solid lubricant films. [Washington, DC]: National Aeronautics and Space Administration, Scientific and Technical Information Division, 1986.

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Book chapters on the topic "Oxyde de graphène"

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Lerf, Anton. "Graphite Oxide Story - From the Beginning Till the Graphene Hype." In Graphene Oxide, 1–35. Chichester, UK: John Wiley & Sons, Ltd, 2016. http://dx.doi.org/10.1002/9781119069447.ch1.

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Jeevaraj, A. Kingson Solomon, and M. Muthuvinayagam. "Graphene Oxide." In Graphene, 91–104. Singapore: Springer Nature Singapore, 2023. http://dx.doi.org/10.1007/978-981-99-1206-3_5.

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Gudarzi, Mohsen Moazzami, Seyed Hamed Aboutalebi, and Farhad Sharif. "Graphene Oxide-Based Composite Materials." In Graphene Oxide, 314–63. Chichester, UK: John Wiley & Sons, Ltd, 2016. http://dx.doi.org/10.1002/9781119069447.ch10.

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Kovbasyuk, Larisa, and Andriy Mokhir. "Toxicity Studies and Biomedical Applications of Graphene Oxide." In Graphene Oxide, 364–81. Chichester, UK: John Wiley & Sons, Ltd, 2016. http://dx.doi.org/10.1002/9781119069447.ch11.

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Pavlidis, Ioannis V. "Catalysis." In Graphene Oxide, 382–409. Chichester, UK: John Wiley & Sons, Ltd, 2016. http://dx.doi.org/10.1002/9781119069447.ch12.

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Lowe, Sean E., and Yu Lin Zhong. "Challenges of Industrial-Scale Graphene Oxide Production." In Graphene Oxide, 410–31. Chichester, UK: John Wiley & Sons, Ltd, 2016. http://dx.doi.org/10.1002/9781119069447.ch13.

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Dimiev, Ayrat M. "Mechanism of Formation and Chemical Structure of Graphene Oxide." In Graphene Oxide, 36–84. Chichester, UK: John Wiley & Sons, Ltd, 2016. http://dx.doi.org/10.1002/9781119069447.ch2.

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Eigler, Siegfried, and Ayrat M. Dimiev. "Characterization Techniques." In Graphene Oxide, 85–120. Chichester, UK: John Wiley & Sons, Ltd, 2016. http://dx.doi.org/10.1002/9781119069447.ch3.

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Vallés, Cristina. "Rheology of Graphene Oxide Dispersions." In Graphene Oxide, 121–46. Chichester, UK: John Wiley & Sons, Ltd, 2016. http://dx.doi.org/10.1002/9781119069447.ch4.

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Naumov, Anton V. "Optical Properties of Graphene Oxide." In Graphene Oxide, 147–74. Chichester, UK: John Wiley & Sons, Ltd, 2016. http://dx.doi.org/10.1002/9781119069447.ch5.

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Conference papers on the topic "Oxyde de graphène"

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Wu, Leiming. "Graphdiyne Oxide as a Promising Candidate for Nonlinear Optical Switching Applications." In Bragg Gratings, Photosensitivity, and Poling in Glass Waveguides, JTu1A.39. Washington, D.C.: Optica Publishing Group, 2024. http://dx.doi.org/10.1364/bgpp.2024.jtu1a.39.

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Graphene oxide demonstrates a significant nonlinear optical response with light intensity dependence upon stimulation by light waves. Taking advantage of this characteristic, graphyne oxide shows important application value in optical switching.
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Jovanovic, S., M. Yasir, W. Saeed, I. Spanopoulos, Z. Syrgiannis, M. Milenkovic, and D. Kepic. "Carbon-Based Nanomaterials in Electromagnetic Interference Shielding: Graphene Oxide, Reduced Graphene Oxide, Electrochemically Exfoliated Graphene, and Biomass-Derivated Graphene." In 2024 International Conference on Manipulation, Automation and Robotics at Small Scales (MARSS), 1–5. IEEE, 2024. http://dx.doi.org/10.1109/marss61851.2024.10612734.

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Hidayah, N. M. S., Wei-Wen Liu, Chin-Wei Lai, N. Z. Noriman, Cheng-Seong Khe, U. Hashim, and H. Cheun Lee. "Comparison on graphite, graphene oxide and reduced graphene oxide: Synthesis and characterization." In PROCEEDINGS OF THE INTERNATIONAL CONFERENCE OF GLOBAL NETWORK FOR INNOVATIVE TECHNOLOGY AND AWAM INTERNATIONAL CONFERENCE IN CIVIL ENGINEERING (IGNITE-AICCE’17): Sustainable Technology And Practice For Infrastructure and Community Resilience. Author(s), 2017. http://dx.doi.org/10.1063/1.5005764.

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Chen, Zhen, Wanyoung Jang, Wenzhong Bao, Chun Ning Lau, and Chris Dames. "Heat Transfer in Encased Graphene." In ASME 2009 Heat Transfer Summer Conference collocated with the InterPACK09 and 3rd Energy Sustainability Conferences. ASMEDC, 2009. http://dx.doi.org/10.1115/ht2009-88370.

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Experimentally understanding the heat transfer in graphene (sheets of graphite a few atoms thick) is important for fundamental physics as well as device applications. In particular, measurements of the heat flow through graphene encased by oxide layers are essential for future graphene-based nanoelectronics, interconnects, and thermal management structures. Here we use a “heat spreader method” to study the heat dissipation performance of encased graphene. Measurements show enhanced heat spreading by a graphene layer as compared to control samples without graphene. At room temperature, the in-plane thermal conductivity of encased graphene sheets of thickness 2 nm and 5 nm is measured to be ∼150 W/m-K, more than one order of magnitude smaller than a published report for a freely-suspended graphene sheet [A. A. Balandin et al., Nano Lett. 8, 902], as well as bulk graphite. We also used a differential 3ω method to measure the thermal contact resistance between graphene and SiO2, finding a value around 10−8 m2-K/W at room temperature. Possible reasons for the unexpectedly low thermal conductivity are also discussed.
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Rohini, Puliyasseri, and Dillibabu Sastikumar. "Synthesis and characterization of Graphite Oxide from Graphite using Nano second pulsed laser ablation in liquid." In Advanced Solid State Lasers. Washington, D.C.: Optica Publishing Group, 2022. http://dx.doi.org/10.1364/assl.2022.jtu6b.17.

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Jankovský, Ondřej, David Sedmidubský, Michal Lojka, and Zdeněk Sofer. "Thermal properties of graphite oxide, thermally reduced graphene and chemically reduced graphene." In INTERNATIONAL CONFERENCE OF NUMERICAL ANALYSIS AND APPLIED MATHEMATICS (ICNAAM 2016). Author(s), 2017. http://dx.doi.org/10.1063/1.4994480.

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Zhang, Yan, Yingying Wang, Yunfei Chen, and Yujuan Wang. "The Friction Forces Between Si Tip and Multilayer Graphene." In ASME 2012 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/imece2012-87131.

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Mechanical peeling method is used to prepare multilayer graphene on silicon wafer with natural oxide, and the layer number of graphene is determined through atomic force microsopy (AFM) topography image and optical image. The friction force between Silicon tip and multilayer graphene and SiO2/Si substrates is measured with AFM. It is found that the friction force is reduced with the increase of the graphene layer number and approaches the value between the Si tip and graphite. Through comparing the tip sliding on graphene with different layers, the deformation of graphene is believed to be the main reason causing the decrease of the friction force with the layer number. When the normal load is much larger than the adhesion force, friction force increases with normal load linearly. However, while normal load closes to the adhesion force, friction force is independent of the normal load.
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Rafitasari, Yeti, Haris Suhendar, Nurul Imani, Fitri Luciana, Hesti Radean, and Iman Santoso. "SINTESIS GRAPHENE OXIDE DAN REDUCED GRAPHENE OXIDE." In SEMINAR NASIONAL FISIKA 2016 UNJ. Pendidikan Fisika dan Fisika FMIPA UNJ, 2016. http://dx.doi.org/10.21009/0305020218.

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Illera, Danny, Chatura Wickramaratne, Diego Guillen, Chand Jotshi, Humberto Gomez, and D. Yogi Goswami. "Stabilization of Graphene Dispersions by Cellulose Nanocrystals Colloids." In ASME 2018 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2018. http://dx.doi.org/10.1115/imece2018-87830.

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The outstanding properties of single-layer graphene sheets for energy storage are hindered as agglomeration or restacking leads to the formation of graphite. The implications of the aforementioned arise on the difficulties associated with the aqueous processing of graphene sheets: from large-scale production to its utilization in solvent-assisted techniques like spin coating or layer-by-layer deposition. To overcome this, aqueous dispersions of graphene were stabilized by cellulose nanocrystals colloids. Aqueous cellulose nanocrystals dispersion highlights as a low-cost and environmentally friendly stabilizer towards graphene large-scale processing. Colloids of cellulose nanocrystals are formed by electrostatic repulsion of fibrils due to de-protonated carboxyl or sulfate half-ester functional groups. Graphene dispersions are obtained by hydrothermal reduction of electrochemically exfoliated graphene oxide in the presence of cellulose nanocrystals. This approach allows the preservation of the intrinsic properties of the nano-sheets by promoting non-covalent interactions between cellulose and graphene. The dispersions could be cast to form free-standing flexible conducting films or freeze-dried to form foams and aerogels for capacitive energy storage.
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Kanbur, Kürşat, Işıl Birlik, Fatih Sargin, Funda Ak Azem, and Ahmet Türk. "Optimization of Oxidation Time During Graphene Oxide Production." In 7th International Students Science Congress. Izmir International guest Students Association, 2023. http://dx.doi.org/10.52460/issc.2023.045.

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Graphene oxide (GO) consists of one or several stacked graphene structures equipped with various functional groups. It has applications in many areas such as biomaterials, energy storage. sensors and photocatalytic degradation thanks to its high surface area, adjustable band gap and dispersibility in various solvents. Although there are various production techniques for GO synthesis, Improved Hummer’s Method stands out with its high efficiency and controllable production parameters. In this method, graphite is oxidized after intercalation with various acids and GO is obtained by exfoliation in the next stages. The effects of production parameters such as oxidation time, oxidant type, oxidant amount, drying processes are generally investigated in Hummer's method. In this study, the effect of oxidation time on GO structure was investigated. In this context, GO was synthesized with various oxidation times by using Modified Hummer's Method. Then, the structural and optical properties of GO were investigated by X-Ray diffraction (XRD), Fourier-Transform infrared spectroscopy (FTIR) and UV-Visible Light spectrophotometer (UV-Vis). The results showed that there is an optimum oxidation time for the oxidation degree of GO structure.
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Reports on the topic "Oxyde de graphène"

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Sevigny, Gary J., Radha K. Motkuri, David W. Gotthold, Leonard S. Fifield, Anthony P. Frost, and Wesley Bratton. Separation of tritiated water using graphene oxide membrane. Office of Scientific and Technical Information (OSTI), June 2015. http://dx.doi.org/10.2172/1222908.

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Blanchard, Jeremy, David C. Gerlach, Randall D. Scheele, Mark L. Stewart, Bruce D. Reid, Phillip A. Gauglitz, Larry M. Bagaasen, et al. Uranium Oxide Aerosol Transport in Porous Graphite. Office of Scientific and Technical Information (OSTI), January 2012. http://dx.doi.org/10.2172/1051989.

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Mattei-Sosa, Jose, Victor Medina, Chris Griggs, and Veera Gude. Crosslinking graphene oxide and chitosan to form scalable water treatment membranes. Engineer Research and Development Center (U.S.), July 2019. http://dx.doi.org/10.21079/11681/33263.

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Mannion, J. M., R. M. Achey, J. H. Hewitt, C. R. Shick, Jr., and M. J. Siegfried. Reduced graphene oxide as a filament material for thermal ionization mass spectrometry. Office of Scientific and Technical Information (OSTI), September 2018. http://dx.doi.org/10.2172/1475282.

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Attias, Andre-Jean, Kwang-Sup Lee, and Alex K. Jen. Coupling Graphene Sheets with Iron Oxide Nanoparticles for Energy Storage and Microelectronics. Fort Belvoir, VA: Defense Technical Information Center, August 2015. http://dx.doi.org/10.21236/ada636883.

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Kichukova, Diana, Daniela Kovacheva, Anna Staneva, and Ivanka Spassova. Аntimicrobial Impact of Nanocomposites of Reduced Graphene Oxide with Silver and Copper. "Prof. Marin Drinov" Publishing House of Bulgarian Academy of Sciences, February 2021. http://dx.doi.org/10.7546/crabs.2021.02.04.

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Pramanik, Avijit, Olorunsola Praise Kolawole, Kaelin Gates, Sanchita Kundu, Manoj Shukla, Robert Moser, Mine Ucak-Astarlioglu, Ahmed Al-Ostaz, and Paresh Chandra Ray. 2D fluorinated graphene oxide (FGO)-polyethyleneimine (PEI) based 3D porous nanoplatform for effective removal of forever toxic chemicals, pharmaceutical toxins, and waterborne pathogens from environmental water samples. Engineer Research and Development Center (U.S.), February 2024. http://dx.doi.org/10.21079/11681/48232.

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Abstract:
Although water is essential for life, as per the United Nations, around 2 billion people in this world lack access to safely managed drinking water services at home. Herein we report the development of a two-dimensional (2D) fluorinated graphene oxide (FGO) and polyethylenimine (PEI) based three-dimensional (3D) porous nanoplatform for the effective removal of polyfluoroalkyl substances (PFAS), pharmaceutical toxins, and waterborne pathogens from contaminated water. Experimental data show that the FGO-PEI based nanoplatform has an estimated adsorption capacity (𝘲ₘ) of ∼219 mg g⁻¹ for perfluorononanoic acid (PFNA) and can be used for 99% removal of several short- and long-chain PFAS. A comparative PFNA capturing study using different types of nanoplatforms indicates that the 𝘲ₘ value is in the order FGO-PEI > FGO > GO-PEI, which indicates that fluorophilic, electrostatic, and hydrophobic interactions play important roles for the removal of PFAS. Reported data show that the FGO-PEI based nanoplatform has a capability for 100% removal of moxifloxacin antibiotics with an estimated 𝘲ₘ of ∼299 mg g⁻¹. Furthermore, because the pore size of the nanoplatform is much smaller than the size of pathogens, it has a capability for 100% removal of Salmonella and Escherichia coli from water. Moreover, reported data show around 96% removal of PFAS, pharmaceutical toxins, and pathogens simultaneously from spiked river, lake, and tap water samples using the nanoplatform.
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Biedermann, Laura, Richard Breckenridge, and Jeffery Preece. Permeation testing of thermal power plant cooling water impacts of Graphite Oxide (GO)/polymer membranes. Office of Scientific and Technical Information (OSTI), December 2018. http://dx.doi.org/10.2172/1528986.

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Medina, Victor, Chandler Noel, and Jose Mattei-Sosa. Conceptual development and testing of a chitosan/graphene oxide (CSGO) “bandage” to isolate and remove chemical contamination from surfaces. Engineer Research and Development Center (U.S.), July 2019. http://dx.doi.org/10.21079/11681/33403.

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Vidal, Judith. Graphene Oxide Fuel Cell Materials Development and Testing: Cooperative Research and Development Final Report, CRADA Number: CRD-16-648. Office of Scientific and Technical Information (OSTI), April 2020. http://dx.doi.org/10.2172/1659914.

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