Relevant bibliographies by topics / Pristine graphene

Academic literature on the topic 'Pristine graphene'

Author: Grafiati
Published: 10 December 2022
Last updated: 22 February 2023

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Journal articles on the topic "Pristine graphene"

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Gai, Yanzhe, Wucong Wang, Ding Xiao, Huijun Tan, Minyan Lin, and Yaping Zhao. "Reversible conversion between graphene nanosheets and graphene nanoscrolls at room temperature." RSC Advances 8, no. 18 (2018): 9749–53. http://dx.doi.org/10.1039/c8ra00475g.

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Yang, Shulin, Zhigao Lan, Huoxi Xu, Gui Lei, Wei Xie, and Qibin Gu. "A First-Principles Study on Hydrogen Sensing Properties of Pristine and Mo-Doped Graphene." Journal of Nanotechnology 2018 (September 5, 2018): 1–5. http://dx.doi.org/10.1155/2018/2031805.

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The adsorption of H2 on the pristine and Mo-doped graphene was investigated by density functional theory (DFT) calculations. The structural and electronic properties of H2-graphene systems were studied to understand the interaction between H2 molecule and graphene-based material. Our calculation results showed the pristine graphene was not an ideal sensing material to detect H2 molecule as it ran far away from the pristine graphene surface. Different with pristine graphene, the Mo-doped graphene presented much higher affinities to the H2 molecule. It was found that the placed H2 molecules could stably be chemisorbed on the Mo-doped graphene with high binding energy. The electronic property of Mo-doped graphene was significantly affected by the strong interaction and orbital hybridization between H2 and Mo-doped graphene sheet. The H2 molecule would capture more charges from the doped graphene than the pristine system, indicating the higher sensitivity for the graphene doped with Mo.
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Qu, Li-Hua, Xiao-Long Fu, Chong-Gui Zhong, Peng-Xia Zhou, and Jian-Min Zhang. "Equibiaxial Strained Oxygen Adsorption on Pristine Graphene, Nitrogen/Boron Doped Graphene, and Defected Graphene." Materials 13, no. 21 (November 4, 2020): 4945. http://dx.doi.org/10.3390/ma13214945.

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We report first-principles calculations on the structural, mechanical, and electronic properties of O2 molecule adsorption on different graphenes (including pristine graphene (G–O2), N(nitrogen)/B(boron)-doped graphene (G–N/B–O2), and defective graphene (G–D–O2)) under equibiaxial strain. Our calculation results reveal that G–D–O2 possesses the highest binding energy, indicating that it owns the highest stability. Moreover, the stabilities of the four structures are enhanced enormously by the compressive strain larger than 2%. In addition, the band gaps of G–O2 and G–D–O2 exhibit direct and indirect transitions. Our work aims to control the graphene-based structure and electronic properties via strain engineering, which will provide implications for the application of new elastic semiconductor devices.
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Tene, Talia, Stefano Bellucci, Marco Guevara, Fabian Arias Arias, Miguel Ángel Sáez Paguay, John Marcos Quispillo Moyota, Melvin Arias Polanco, et al. "Adsorption of Mercury on Oxidized Graphenes." Nanomaterials 12, no. 17 (August 31, 2022): 3025. http://dx.doi.org/10.3390/nano12173025.

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Graphene oxide (GO) and its reduced form, reduced graphene oxide (rGO), are among the most predominant graphene derivatives because their unique properties make them efficient adsorbent nanomaterials for water treatment. Although extra-functionalized GO and rGO are customarily employed for the removal of pollutants from aqueous solutions, the adsorption of heavy metals on non-extra-functionalized oxidized graphenes has not been thoroughly studied. Herein, the adsorption of mercury(II) (Hg(II)) on eco-friendly-prepared oxidized graphenes is reported. The work covers the preparation of GO and rGO as well as their characterization. In a further stage, the description of the adsorption mechanism is developed in terms of the kinetics, the associated isotherms, and the thermodynamics of the process. The interaction between Hg(II) and different positions of the oxidized graphene surface is explored by DFT calculations. The study outcomes particularly demonstrate that pristine rGO has better adsorbent properties compared to pristine GO and even other extra-functionalized ones.
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Ardenghi, J. S., P. Bechthold, E. Gonzalez, P. Jasen, and A. Juan. "Ballistic transport properties in pristine/doped/pristine graphene junctions." Superlattices and Microstructures 72 (August 2014): 325–35. http://dx.doi.org/10.1016/j.spmi.2014.04.019.

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Song, Yao-Dong, Liang Wang, and Li-Ming Wu. "Theoretical study of the CO, NO, and N2 adsorptions on Li-decorated graphene and boron-doped graphene." Canadian Journal of Chemistry 96, no. 1 (January 2018): 30–39. http://dx.doi.org/10.1139/cjc-2017-0346.

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The adsorption properties of common gas molecules (CO, NO, and N2) on the surface of Li-decorated pristine graphene and Li-decorated boron doped graphene are investigated using density functional theory. The adsorption energy, charge transfer, and density of states of gas molecules on three surfaces have been calculated and discussed, respectively. The results show that Li-decorated pristine graphene has strong interaction with CO and N2. Compared with Li-decorated pristine graphene, Li-decorated boron doped graphene exhibit a comparable adsorption ability of CO and N2. Moreover, Li-decorated boron doped graphene have a more significant adsorption energy to NO than that of Li-decorated pristine graphene because of the chemical interaction of the NO gas molecule. The strong interaction between the NO molecule and substrate (Li-decorated boron doped graphene) induces dramatic changes to the electrical conductivity of Li-decorated boron doped graphene. The results indicate that Li-decorated boron doped graphene would be an excellent candidate for sensing NO gas.
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Zhang, Jincan, Kaicheng Jia, Yongfeng Huang, Xiaoting Liu, Qiuhao Xu, Wendong Wang, Rui Zhang, et al. "Intrinsic Wettability in Pristine Graphene." Advanced Materials 34, no. 6 (December 16, 2021): 2103620. http://dx.doi.org/10.1002/adma.202103620.

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Rabelo, J. N. Teixeira, and Ladir Cândido. "Strong anharmonicity in pristine graphene." Journal of Physics Communications 2, no. 9 (September 17, 2018): 095013. http://dx.doi.org/10.1088/2399-6528/aadd76.

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Rodríguez-Pérez, Laura, Ma Ángeles Herranz, and Nazario Martín. "The chemistry of pristine graphene." Chemical Communications 49, no. 36 (2013): 3721. http://dx.doi.org/10.1039/c3cc38950b.

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Kausar, Ayesha. "Avant-Garde Polymer and Nano-Graphite-Derived Nanocomposites—Versatility and Implications." C 9, no. 1 (January 19, 2023): 13. http://dx.doi.org/10.3390/c9010013.

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Graphite (stacked graphene layers) has been modified in several ways to enhance its potential properties/utilities. One approach is to convert graphite into a unique ‘nano-graphite’ form. Nano-graphite consists of few-layered graphene, multi-layered graphene, graphite nanoplatelets, and other graphene aggregates. Graphite can be converted to nano-graphite using physical and chemical methods. Nano-graphite, similar to graphite, has been reinforced in conducting polymers/thermoplastics/rubbery matrices to develop high-performance nanocomposites. Nano-graphite and polymer/nano-graphite nanomaterials have characteristics that are advantageous over those of pristine graphitic materials. This review basically highlights the essential features, design versatilities, and applications of polymer/nano-graphite nanocomposites in solar cells, electromagnetic shielding, and electronic devices.
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Dissertations / Theses on the topic "Pristine graphene"

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Aikebaier, Faluke. "Effects of electron-electron interaction in pristine and doped graphene." Thesis, Linnéuniversitetet, Institutionen för fysik och elektroteknik (IFE), 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:lnu:diva-37467.

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The goal of this master thesis is to investigate the eect of electron-electron interaction on electronic properties of graphene that can be measured experimentally. A tight-binding model, which includes up to next-nearest-neighbor hopping, with parameters tted to density functional theory calculations, has been used to describe the electronic structure of graphene. The electron-electron interaction is described by the Hubbard model using a mean- eld approximation. Based on the analysis of dierent tight-binding models available in the literature, we conclude that a next-nearest-neighbor tight-binding model is in better agreement with density functional theory calculations, especially for the linear dispersion around the Dirac point. The Fermi velocity in this case is very close to the experimental value, which was measured by using a variety of techniques. Interaction-induced modi cations of the linear dispersion around the Dirac point have been obtained. Unlike the non-local Hartree-Fock calculations, which take into account the long-range electron-electron interaction and yield logarithmic corrections, in agreement with experiment, we found only linear modi cations of the Fermi velocity. The reasons why one cannot obtain logarithmic corrections using the mean- eld Hubbard model have been discussed in detail. The remaining part of the thesis is focused on calculations of the local density of states around a single substitutional impurity in graphene. This quantity can be directly compared to the results of the scanning tunneling microscopy in doped graphene. We compare explicitly non-interacting and interacting cases. In the latter case, we performed self-consistent calculations, and found that electron-electron interaction has a signi cant eect on the local density of states. Furthermore, the band gap at high-symmetry points of the Brillouin zone of a supercell, triggered by the impurity, is modi ed by interactions. We use a perturbative model to explain this eect and quantitative agreement with numerical results. In conclusion, it is expected that the long-range electron-electron nteraction is extremely strong and important in graphene. However, as this thesis has shown, interactions at the level of the Hubbard model and mean- eld approximation also introduce corrections to the electronic properties of graphene.
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CONVERTINO, Domenica. "Interfacing graphene with peripheral neurons: influence of neurite outgrowth and NGF axonal transport." Doctoral thesis, Scuola Normale Superiore, 2020. http://hdl.handle.net/11384/90468.

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Graphene displays properties that make it appealing for neuroregenerative medicine, yet the potential of large-scale highly-crystalline graphene as a conductive peripheral neural interface has been scarcely investigated. In particular, pristine graphene offers enhanced electrical properties that can be advantageous for nervous system regeneration applications. In this work, we investigate graphene potential as peripheral nerve interface. First, we perform an unprecedented analysis aimed at revealing how the typical polymeric coatings for neural cultures distribute on graphene at the nanometric scale. Second, we examine the impact of graphene on the culture of two established cellular models for peripheral nervous system: PC12 cell line and primary embryonic rat dorsal root ganglion (DRG) neurons, showing a better and faster axonal elongation using graphene. We then observe that the axon elongation in the first days of culture correlates to an altered nerve growth factor (NGF) axonal transport, with a reduced number of retrogradely moving NGF vesicles in favor of stalled vesicles. We thus hypothesize that the axon elongation observed in the first days of culture could be mediated by this pool of NGF vesicles locally retained in the medial/distal parts of axons. Furthermore, we investigate electrophysiological properties and cytoskeletal structure of peripheral neurons. We observe a reduced neural excitability and altered membrane potential together with a reduced inter-microtubular distance on graphene and correlate these electrophysiological and structural reorganizations of axon physiology to the observed vesicle stalling. Finally, the potential of another 2D material as neural interface, tungsten disulfide, is explored.
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Zhao, Liuyan. "Chemical Vapor Deposition Grown Pristine and Chemically Doped Monolayer Graphene." Thesis, 2013. https://doi.org/10.7916/D8W09D9H.

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Chemical vapor deposition growth has been a popular technique to produce large-area, high-quality monolayer graphene on Cu substrates ever since its first demonstration in 2009. Pristine graphene grown in such a way owns the natures of zero charge carriers and zero band gap. As an analogy to semi-conductor studies, substitutional doping with foreign atoms is a powerful way to tailor the electronic properties of this host materials. Within such a context, this thesis focuses on growing and characterizing both pristine and chemically-doped CVD grown monolayer graphene films at microscopic scales. We first synthesized pristine graphene on Cu single crystals in ultra-high-vacuum and subsequently characterized their properties by scanning tunneling microscopy/spectroscopy (STM/S), to learn the effects of Cu substrate crystallinity on the quality of graphene growth and understand the interactions between graphene films and Cu substrates. In the subsequent chapters, we chemically doped graphene with nitrogen (N) and boron (B) atoms, and characterized their topographic and electronic structures via STM/S. We found that both N and B dopants substitionally dope graphene films, and contribute electron and hole carriers, respectively, into graphene at a rate of approximately 0.5 carrier/dopant. Apart from this, we have made comparisons between N- and B-doped graphene films in aspects of topographic features, dopant distribution and electronic perturbations. In the last part of this thesis, we used Raman spectroscopy mapping to investigate the N dopant distribution within and across structural grains. Future experiments are also brief discussed at the end of the thesis.
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Bagley, Jacob David. "Fabrication of Pristine and Doped Graphene Nanostripes and their Application in Energy Storage." Thesis, 2021. https://thesis.library.caltech.edu/14069/1/JacobBagley_ThesisPDF.pdf.

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Fossil fuel usage causing rising CO2 levels and leading to climate change is, perhaps, the most pressing issue of our time. However, our economic dependence on energy necessitates its usage such that reducing energy usage is not possible leaving transitioning to renewable energy technologies as the only sustainable option. Currently, the largest barrier to large scale incorporation of renewable energy sources (e.g., solar, wind) is the high cost of energy storage technologies. Electrochemical energy storage technologies (e.g., lithium-ion batteries and supercapacitors) have been identified as a key approach for enabling the transition to renewable energy technologies.

Graphene is a material with exceptional properties that is receiving much attention for application in various energy storage technologies and could help reduce the cost of energy storage technologies. This thesis describes a novel fabrication procedure for low-cost and efficient synthesis of high-quality graphene nanostripes (GNSPs) and their application in lithium-ion battery and supercapacitor electrodes.

This thesis is structured as follows. Chapter 1 outlines the motivation and technical background of this research. Chapter 2 describes the instrumentation and procedures for fabricating GNSPs. Chapter 3 describes in situ exfoliation of GNSPs as electrodes in supercapacitors to increase the capacitance. Chapter 4 describes synthesis and application of pyridinic-type nitrogen-doped GNSPs as a lithium-ion battery anode. Chapter 5 describes the synthesis and application of silicon-, germanium-, and tin-doped GNSPs and their application in lithium-ion battery anodes. Chapter 6 concludes and synthesizes the findings of the thesis holistically. Additionally, future outlook and potential research objectives are presented.

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MonsaludEbuen, Anna Sophia, and 游安純. "Study of Piezo-related and Photoelectrochemical Properties of Pristine Bi4Ti3O12 and Bi4Ti3O12-Reduced Graphene Oxide Nanocomposite Thin Films." Thesis, 2018. http://ndltd.ncl.edu.tw/handle/w9az4m.

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碩士
國立成功大學
材料科學及工程學系
106
Bi4Ti3O12 films and Bi4Ti3O12/rGO composites on FTO substrates were fabricated using a facile sol-gel method and were investigated regarding its piezo-related capabilities, photocatalysis, and PEC properties. UV-illumination and a hydrothermal approach were employed to reduce GO to rGO, which was ascertained through XRD, Raman and XPS. The bonding between Bi4Ti3O12 and rGO was also ascertained through XPS because of the presence of the Ti-O-C peak on the samples of Bi4Ti3O12/rGO (UV) and Bi4Ti3O12/rGO (hydro). The piezo-related studies of the pristine Bi4Ti3O12, Bi4Ti3O12/rGO (UV), and Bi4Ti3O12/rGO (hydro) indicated minor piezotronic and piezophototronic effects, which was attributed to poor inducement of piezopotential because of random distribution of Bi4Ti3O12 crystals instead of well aligned morphology. However, the photocatalytic and piezophotocatalytic properties of the samples were promising, wherein Bi4Ti3O12/rGO (hydro) sample exhibited the best performance with k of approximately 24  10-3/min-1, which was 4~5 times higher than that of the pristine Bi4Ti3O12. In addition, the excellent photoelectrochemical performance of composite samples was preliminarily determined from the observation of an enhancement in its photocurrent density under visible light illumination. The photocatalytic properties were consistent with the deduced energy band diagram, which showed that a more negative conduction band positions than the formation potential of superoxide radicals (O2/•O2-) was ideal for photodegradation applications, and that the conduction and valence band edge potentials straddled the hydrogen and oxygen redox potentials was excellent for overall photoelectrochemical water splitting.
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Ho, Van Dac. "Development of Next-Generation Construction Materials with Graphene Additives." Thesis, 2020. http://hdl.handle.net/2440/128468.

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The developments of ordinary Portland cement (OPC) composites and alkali-activated binder composites have attracted significant attention in the past decade. Different technologies have been proposed to address current drawbacks of these construction materials (e.g. low tensile strength, flexural strength, and brittleness), reduce the amount of cement consumption or replace OPC products for minimizing the environmental impact of construction materials. Among many additives explored to address these problems, graphene-based materials have emerged in the last few years as one of the most promising additives with many exciting results. However, it is still lacking the depth of understanding the influence of key parameters of graphene materials, such as dosages and sizes, on mechanical and durability properties of the composites, and enhancing mechanism of pristine graphene (PRG) in the cement matrix. Moreover, no study has been reported on the influence of graphene oxide (GO) additives on mechanical and durability properties of fly ash (FA)/ ground granulated blast furnace slag (GGBS) alkali-activated binder (AAB) composites prepared with natural sand (NS) or lead smelter slag (LSS) sand cured at ambient temperature. This thesis consists of a series of studies with the focus on addressing current research gaps and making a contribution to the development of next-generation construction materials using graphene additives. The first experimental study on the effect of the dosage of an ultra-large size (56μm) of PRG industrially manufactured by an electrochemical process on compressive and tensile strengths of cement-based mortars reveals that the addition of PRG to mortars improves their mechanical properties, with characteristic concentration dependence. The mortar with 0.07% PRG is identified as the optimal concentration, which provides 34.3% and 26.9% improvement in compressive and tensile strength at 28 days, respectively. However, with the further increases in PRG contents, the enhancement of mechanical properties of mortars is limited due to the impact of the van der Waals force on the sedimentation of PRG suspension. The second study focuses on the size effect of PRG on mechanical strengths of cement-based mortars by considering a variety of PRG sizes, such as 5μm, 43μm, 56μm, and 73μm at the optimal dosage of 0.07% PRG. The study reveals that the mechanical strengths of mortars at 7 and 28 days significantly depend on the sizes of PRG. The mixes with size 56μm and 73μm show a significant influence on both the compressive and tensile strengths of mortars. In contrast, the mix containing size 43μm exhibits a significant increase in tensile strengths only. There are no significant effects on either compressive or tensile strengths for the mix with size 5μm. The third study presents the proposed reinforcing mechanism and optimized dosage of PRG for enhancing mechanical properties of cement-based mortars. The results confirmed that the strengths of the mortars depend on PRG dosages. The size of PRG has a significant effect on the enhancement rate of the mechanical strengths of the mortars, whereas it does not have a significant influence on the optimized PRG dosage for the mechanical strengths of the cement-based mortars. The dosage at 0.07% PRG is identified as the optimized concentration of PRG for enhancing mechanical strengths. The reinforcing mechanism of PRG in the cement matrix highly depends on the surface area of PRG sheets. The fourth and fifth studies show the effect of the dosages, sizes, and densities of PRG as well as design mixes on mechanical and durability properties of cement-based mortars cured at short-term and long-term periods. The study reveals that the addition of PRG to mortars can enhance compressive, flexural, and tensile strengths of mortars at different curing ages. The 0.07% PRG is identified as the optimum dosage for enhancing the mechanical strengths of the mortars. Incorporating a small amount of PRG additives into the mortar can improve its durability, such as water absorptions, voids, sulphate expansion, and water penetration depths. The results of the mix containing PRG size 73μm show the best improvement in the mechanical and durability properties of the mortars, followed by that of size 20μm and then size 40μm. The last experimental study on the influence of GO additive on mechanical and durability properties of AAB mortars containing NS and LSS sand cured at ambient temperature reveals that the increase of GGBS% in AAB results in a significant increase in compressive and tensile strengths, and a decrease in flowability, water absorption and dry shrinkage of the mortars. The results also show that the mortars with 0.05% and 0.1% GO additives provide better mechanical and durability properties compared to the control mixes. The results generated from this thesis show great potential for using PRG and GO as additives in OPC and AAB composites to develop next-generation construction materials. They not only address the current drawbacks of OPC and AAB composites but also reduce the environmental impact of using OPC and NS.
Thesis (Ph.D.) -- University of Adelaide, School of Civil, Environmental and Mining Engineering, 2020
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Matsoso, Boitumelo Joyce. "CVD growth of pristine and N-doped graphene films for support of platinum and palladium nanoparticles in electrochemical sensing of dopamine and uric acid." Thesis, 2017. https://hdl.handle.net/10539/26509.

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A thesis submitted to the Faculty of Science, University of the Witwatersrand, Johannesburg, in fulfilment of the requirements for degree of Doctor of Philosophy in Chemistry, 2017
The synthesis of large-area graphene and nitrogen doped graphene films by atmospheric pressure chemical vapour deposition, for application in electrochemical sensors provides a new platform for developing inexpensive techniques for selective and ultrasensitive detection of electroactive biomolecules. Therefore, optimum growth condition for the synthesis of good quality bilayered graphene films by APCVD technique on a Cu catalyst was developed (10 minutes growth time; 10 sccm of methane). The quality and thickness of the as-synthesized graphene films was further improved by using 3 sccm of hydrogen gas throughout the annealing and growth process. Doping of graphene with nitrogen atoms has been reported to be the most promising technique for modulating the structural and electrochemical properties of as-grown graphene films. A synthesis method for growing nitrogen doped graphene films with high nitrogen content was obtained by in-situ route using 5 sccm of ammonia. Furthermore, both overall nitrogen content (N/C) and configurations in N-doped graphene films were controlled by varying the growth times (i.e. 2, 5, 10, and 20 min). The results indicated that short growth time (2 min) led to N-graphene films that are rich in pyridinic-N and highest N/C value (4.68 %), while longer growth time (20 min) resulted in formation of graphitic-N rich films with N/C value of 2.84 %. Electrocatalytic activity of pristine and Ndoped graphene films as well as pristine and N-graphene-platinum and palladium composites were investigated towards oxidation of dopamine and uric acid. Nitrogen doped based and metal-composite based electrochemical sensors showed better electrocatalytic activity and sensitivity compared to their undoped counterparts. Apart from single atom doping graphene with nitrogen atoms, co-doping with boron and nitrogen atoms was investigated for formation of semiconducting hybrid materials with tunable optical properties. By adjusting the flow rates of methane and the vaporization temperature of boric acid, two types of graphene and hexagonal boron nitride (h-BN) hybrid films were formed. This included novel crystalline hexagonal boron nitride (h-BN) quantum- and nanodots embedded in large-area boron carbon nitride (BCN) films and the atomically thin and quaternary semiconducting hybrid films of boron carbon oxynitride (BCNO).
XL2019
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Books on the topic "Pristine graphene"

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Gaier, James R. Homogeneity of pristine and bromine intercalated graphite fibers. [Washington, DC]: National Aeronautics and Space Administration, 1985.

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Gaier, James R. Effect of length of chopped pristine and intercalated graphite fibers on the resistivity of fiber networks. Cleveland, Ohio: Lewis Research Center, NASA, 1988.

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R, Gaier James, and United States. National Aeronautics and Space Administration., eds. The milling of pristine and brominated P-100 graphite fibers. [Washington, D.C.]: National Aeronautics and Space Administration, 1986.

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John, Miller, and United States. National Aeronautics and Space Administration., eds. Thermal conductivity of pristine and brominated P-100 fibers. [Washington, D.C.]: National Aeronautics and Space Administration, 1986.

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Resistivity of pristine and intercalated graphite fiber epoxy composites. [Washington, D.C.]: NASA, 1990.

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Book chapters on the topic "Pristine graphene"

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Georgakilas, Vasilios. "Covalent Attachment of Organic Functional Groups on Pristine Graphene." In Functionalization of Graphene, 21–58. Weinheim, Germany: Wiley-VCH Verlag GmbH & Co. KGaA, 2014. http://dx.doi.org/10.1002/9783527672790.ch2.

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Zubarev, Dmitry Yu, Xiaoqing You, Michael Frenklach, and William A. Lester. "Delocalization Effects in Pristine and Oxidized Graphene Substrates." In Advances in the Theory of Quantum Systems in Chemistry and Physics, 553–69. Dordrecht: Springer Netherlands, 2011. http://dx.doi.org/10.1007/978-94-007-2076-3_29.

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Polichetti, T., M. L. Miglietta, B. Alfano, E. Massera, F. Villani, G. Di Francia, and P. Delli Veneri. "Fabrication and Characterizations of Pristine and Metal Oxide Nanoparticles Decorated Graphene Sheets." In Lecture Notes in Electrical Engineering, 373–79. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-37558-4_56.

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Sharma, Vaishali, Hardik L. Kagdada, Dheeraj K. Singh, and Prafulla K. Jha. "Trapping Melamine with Pristine and Functionalized Graphene Quantum Dots: DFT and SERS Studies." In Springer Proceedings in Physics, 441–51. Singapore: Springer Singapore, 2019. http://dx.doi.org/10.1007/978-981-15-0202-6_35.

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Chaitanya Sagar, T., and Viswanath Chinthapenta. "Lower and Upper Bound Estimates of Material Properties of Pristine Graphene: Using Quantum Espresso." In Advances in Structural Integrity, 253–65. Singapore: Springer Singapore, 2017. http://dx.doi.org/10.1007/978-981-10-7197-3_22.

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Farinre, Olasunbo, Hawazin Alghamdi, and Prabhakar Misra. "Spectroscopic Characterization and Molecular Dynamics Simulation of Tin Dioxide, Pristine and Functionalized Graphene Nanoplatelets." In Computational and Experimental Simulations in Engineering, 29–43. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-64690-5_4.

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"Characterization of Pristine and Functionalized Graphene on Metal Surfaces by Electron Spectroscopy." In Graphene Science Handbook, 287–304. CRC Press, 2016. http://dx.doi.org/10.1201/b19460-24.

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Kharche, Neerav, and Saroj K. Nayak. "Quasi-Particle Electronic Structure of Pristine and Hydrogenated Graphene on Weakly Interacting Hexagonal Boron Nitride Substrates." In Graphene, Carbon Nanotubes, and Nanostructures, 25–39. CRC Press, 2017. http://dx.doi.org/10.1201/b13905-2.

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Tammeveski, K., and E. Kibena-Põldsepp. "Electrocatalysis of Oxygen Reduction on Pristine and Heteroatom-Doped Graphene Materials." In Encyclopedia of Interfacial Chemistry, 497–506. Elsevier, 2018. http://dx.doi.org/10.1016/b978-0-12-409547-2.13371-2.

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Botti, Sabina, Alessandro Rufoloni, Tomas Rindzevicius, and Michael Stenbæk Schmidt. "Surface-Enhanced Raman Spectroscopy Characterization of Pristine and Functionalized Carbon Nanotubes and Graphene." In Raman Spectroscopy. InTech, 2018. http://dx.doi.org/10.5772/intechopen.74065.

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Conference papers on the topic "Pristine graphene"

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Liqin, Wang, and Wang Liguang. "Electronic Properties of Pristine and Boron-doped Triangular Graphene." In 2010 Third International Conference on Information and Computing Science (ICIC). IEEE, 2010. http://dx.doi.org/10.1109/icic.2010.161.

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Alkhouzaam, Abedalkader Ibraheem, Hazim Qiblawey, and Majeda Khraisheh. "Bio-inspired Fabrication of Ultrafiltration Membranes incorporating Polydopamine Functionalized Graphene Oxide Nanoparticles." In Qatar University Annual Research Forum & Exhibition. Qatar University Press, 2021. http://dx.doi.org/10.29117/quarfe.2021.0046.

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Novel PSF composite UF membranes incorporating low loadings of polydopamine-functionalized graphene oxide particles (rGO-PDA) were fabricated and investigated. The functionalization was confirmed using FTIR-UATR, Raman spectra, XPS, and SEM. Pristine PSF, PSF/GO, and PSF/rGO-PDA MMMs were then prepared using the phase inversion technique and analyzed using FTIR, SEM, AFM, and contact angle (CA). The cross-section SEM images showed better distribution of rGO-PDA particles in the pores and polymer wall whereas the pristine GO particles aggregate and partially block the pores. Thus, the pure water flux increased with the addition of rGO-PDA without affecting the rejection properties, while the flux decreased with the embedding of pristine GO particles. The highest pure water permeability (PWP) was obtained with PSF/rGO-PDA-0.1 to be approximately twice that of the pristine PSF and PSF/GO-0.1. All membranes exhibited complete rejection of BSA and HA, and showed almost similar performance against different dyes. The FRRs of the pristine PSF after three fouling cycles (FRR3) against BSA and HA were recorded to be 57.8% and 70.7% respectively. FRR3 was enhanced by around 30% with PSF/rGO-PDA composites. The MMMs prepared in this work are expected to have great potential on ultrafiltration and similar studies on other membrane processes.
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MAHMUD, HASHIM AL, ,. MATTHEW RADUE, WILLIAM PISANI, and GREGORY ODEGARD. "COMPUTATIONAL MODELING OF EPOXY-BASED HYBRID COMPOSITES REINFORCED WITH CARBON FIBERS AND FUNCTIONALIZED GRAPHENE NANOPLATELETS." In Thirty-sixth Technical Conference. Destech Publications, Inc., 2021. http://dx.doi.org/10.12783/asc36/35846.

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The impact on the mechanical properties of unidirectional carbon fiber (CF)/epoxy composites reinforced with pristine graphene nanoplatelets (GNP), highly concentrated graphene oxide (GO), and Functionalized Graphene Oxide (FGO) are investigated in this study. The localized reinforcing effect of each of the graphene nanoplatelet types on the epoxy matrix is predicted at the nanoscale-level by molecular dynamics. The bulk-level mechanical properties of unidirectional CF/epoxy hybrid composites are predicted using micromechanics techniques considering the reinforcing function, content, and aspect ratios for each of the graphene nanoplatelets. In addition, the effect of nanoplatelets dispersion level is also investigated for the pristine graphene nanoplatelets considering a lower dispersion level with four layers of graphene nanoplatelets (4GNP). The results indicate that the shear and transverse properties are significantly affected by the nanoplatelet type, loading and aspect ratio. The results of this study can be used in the design of hybrid composites to tailor specific laminate properties by adjusting nanoplatelet parameters.
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Oviroh, Peter Ozaveshe, Lesego M. Mohlala, and Tien-Chien Jen. "Effects of Defects on Nanoporous Graphene and MoS2." In ASME 2020 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2020. http://dx.doi.org/10.1115/imece2020-23442.

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Abstract Nanoporous 2D materials such as grapheme and MoS2 promises better filtrations in water channels. However certain parameters that affects these materials for effective deployment need to be studied. In this paper, molecular dynamics (MD) simulation was performed to study the effects of defects that could increase the prospect of tuning the efficiency of the materials in the transportation, catalysis and mechanical reaction efficiency. Consideration of the interfaces between them could lead to improved functionalities of the materials. This paper systematically compares MoS2 and graphene membranes to highlight specific features and benefits. the Young’s modulus of the pristine monolayer MoS2 was calculated to be 447GPa while that of the defective MoS2 was found to be in the range of (314–374) GPa. The Young’s Modulus for Graphene was 783.2 GPa. The relative variation of the Young’s modulus on MoS2 is in the range (13–35) % while that of graphene is (13–21) %. From the results obtained, the maximum pressure that the MoS2 can withstand depends not just on the spacing and size of the nanopores, but also on the area of the defects in the membrane. These findings could help build and proliferate tunable filtration nanodevices and other applications.
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Wong, Kien Liong, Mu Wen Chuan, Afiq Hamzah, Nurul Ezaila Alias, Cheng Siong Lim, and Michael Loong Peng Tan. "Performance Metrics of Pristine Graphene Nanoribbons Field-Effect Transistor with Different Types of Contacts." In 2020 IEEE 2nd International Conference on Artificial Intelligence in Engineering and Technology (IICAIET). IEEE, 2020. http://dx.doi.org/10.1109/iicaiet49801.2020.9257814.

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Rashid, M. Haroon, Ants Koel, and Toomas Rang. "Phenol and Methanol Detector Based on Pristine Graphene Nano-sheet: A First Principles Study." In 2018 16th Biennial Baltic Electronics Conference (BEC). IEEE, 2018. http://dx.doi.org/10.1109/bec.2018.8600982.

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Das, Subhajit, Sandip Bhattacharya, Debaprasad Das, and Hafizur Rahaman. "Comparative Stability Analysis of Pristine and AsF5 Intercalation Doped Top Contact Graphene Nano Ribbon Interconnects." In 2019 2nd International Symposium on Devices, Circuits and Systems (ISDCS). IEEE, 2019. http://dx.doi.org/10.1109/isdcs.2019.8719094.

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Rashid, M. Haroon, Ants Koel, and Toomas Rang. "Simulations of Methane and Acetone Detector Based on Pristine Graphene Nano-sheet Over Intrinsic 4H-SiC Substrate." In 2019 IEEE 19th International Conference on Nanotechnology (IEEE-NANO). IEEE, 2019. http://dx.doi.org/10.1109/nano46743.2019.8993880.

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Bockute, Kristina. "Photoluminescence and structural defects of ZnO films deposited by reactive magnetron sputtering with unconventional Ar-O2 gas mixture formation." In SurfCoat Korea and Graphene Korea 2021 International Joint Virtual Conferences. Setcor Conferences and Events, 2021. http://dx.doi.org/10.26799/cp-surfcoat-graphene-korea-2021/1.

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ZnO is a well-known traditional industrial material which has high potential to become one of the key components for the next generation of future electronics, LED emitters, visible light photocatalysis and others. In its pristine form ZnO has relatively wide band gap of approximately 3.4 eV, but a lot of emerging applications requires some level of electronic structure engineering and structure optimisation. Studies show that ZnO properties strongly depend on the intrinsic defects type and concentrations. Both characteristics usually are depending on the synthesis method. Accordingly, there is great interest to develop new methods which would allow to obtain ZnO with optimised band gap and other properties. In current, study ZnO films were deposited using reactive magnetron sputtering with unconventional Ar-O2 gas mixture supply control: Ar flow was controlled to maintain total gas pressure at 1x10-2 mbar, whereas O2 flow rate was actively adjusted to maintain the selected intensity of optical zinc emission from the working cathode zone. Applying such ZnO formation method it was possible to stabilise reactive magnetron sputtering process over wide range of conditions. Elemental composition analysis by XPS revealed that despite large variations in Zn emission peak intensity within tested experimental conditions all films had nearly identical Zn:O ratios but at the same time their structural and optical properties differed significantly. The colour of the films varied from highly transparent yellowish-greenish, to intense orange, to opaque black. XRD analysis showed that films consisted of single polycrystalline wurtzite phase with varying orientations. PL spectroscopy analysis revealed that films had a lot of various defects including oxygen and zinc vacancies, interstitials and surface defects. Wide variation of ZnO properties obtained by different reactive sputtering conditions demonstrates the potential of the proposed method to control the formation of various intrinsic defects and to tailor their concentration.
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Vigneshwaran, G. V., S. Balasivanandha Prabu, and R. Paskaramoorthy. "Effect of Graphene Addition on Crack Propagation Resistance in Glass Fibre Reinforced Polymer Matrix Composite." In ASME 2018 13th International Manufacturing Science and Engineering Conference. American Society of Mechanical Engineers, 2018. http://dx.doi.org/10.1115/msec2018-6563.

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The effect of graphene nanoplatelets (GNPs) on enhancing the interlaminar fracture toughness of glass fiber/epoxy composites was investigated. The GnPs were physically deposited on the fiber surface by the dip coating technique. The composites were fabricated by hand layup technique followed by the compression molding process. Mode-I fracture test was conducted on the composite specimens. Crack propagation was studied by the digital image correlation (DIC) technique. Mode-I fracture toughness for composites loaded with 0.5 wt.% GnPs showed improvement by an average of 60% when compared to the pristine composites. It is concluded that the addition of GnPs produces a strong fiber/matrix interface bonding which effectively limits the crack propagation.
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