Relevant bibliographies by topics / Carbon dopin

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  2. Dissertations / Theses
  3. Books
  4. Book chapters
  5. Conference papers
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Academic literature on the topic 'Carbon dopin'

Author: Grafiati
Published: 4 June 2021
Last updated: 15 February 2022

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Journal articles on the topic "Carbon dopin"

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López-Salas, Nieves, María C. Gutiérrez, Conchi O. Ania, José Luís G. Fierro, M. Luisa Ferrer, and Francisco del Monte. "Efficient nitrogen-doping and structural control of hierarchical carbons using unconventional precursors in the form of deep eutectic solvents." J. Mater. Chem. A 2, no. 41 (2014): 17387–99. http://dx.doi.org/10.1039/c4ta03266g.

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Chen, Xiang, Xiao-Ru Chen, Ting-Zheng Hou, Bo-Quan Li, Xin-Bing Cheng, Rui Zhang, and Qiang Zhang. "Lithiophilicity chemistry of heteroatom-doped carbon to guide uniform lithium nucleation in lithium metal anodes." Science Advances 5, no. 2 (February 2019): eaau7728. http://dx.doi.org/10.1126/sciadv.aau7728.

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The uncontrollable growth of lithium (Li) dendrites seriously impedes practical applications of Li metal batteries. Various lithiophilic conductive frameworks, especially carbon hosts, are used to guide uniform Li nucleation and thus deliver a dendrite-free composite anode. However, the lithiophilic nature of these carbon hosts is poorly understood. Herein, the lithiophilicity chemistry of heteroatom-doped carbon is investigated through both first principles calculations and experimental verifications to guide uniform Li nucleation. The electronegativity, local dipole, and charge transfer are proposed to reveal the lithiophilicity of doping sites. Li bond chemistry further deepens the understanding of lithiophilicity. The O-doped and O/B–co-doped carbons exhibit the best lithiophilicity among single-doped and co-doped carbons, respectively. The excellent lithiophilicity achieved by O-doping carbon is further validated by Li nucleation overpotential measurement. This work uncovers the lithiophilicity chemistry of heteroatom-doped carbons and affords a mechanistic guidance to Li metal anode frameworks for safe rechargeable batteries.
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Zhao, Chun Xia, Yun Xia Yang, Wen Chen, Paul A. Webley, Xiao Yu Li, Jin Qiao Cao, and Jing Jing Du. "Characterization and Electrochemical Properties of Nitrogen-Doped Ordered Microporous Carbons Containing Well-Dispersed Platinum Nanoparticles." Advanced Materials Research 284-286 (July 2011): 875–79. http://dx.doi.org/10.4028/www.scientific.net/amr.284-286.875.

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Ordered high surface area microporous carbon molecular sieves containing well-dispersed platinum nanoparticles have been prepared by chemical vapor deposition method. Acetonitrile was employed as carbon and nitrogen precursors to yield N-doped carbon molecular sieves. N-doped carbons have an average nitrogen content of ~ 4.1 wt%. Electrochemical tests showed that the rectangular-shaped CVs of N-doped carbons could be well retained over a wide range of scan rates (5~100 mV/s), and the CV curves presented a steep current change at the switching potentials. N-doped carbons exhibited excellent performance as an electrochemical supercapacitor with a calculated specific capacitance of 168 F/g. Meanwhile, it was noticed that a reasonable Pt loading would help to improve the capacitance. It was proposed that the polarizability or surface state modification by nitrogen doping and regular interconnected porous structure might contribute to the improvement of N-doped carbons’ electrochemical properties.
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Ahiduzzaman, Md, and A. K. M. Sadrul Islam. "PREPARATION OF CONDUCTING CARBON FROM RICE HUSK CHAR." Journal of Mechanical Engineering 43, no. 1 (July 22, 2013): 29–32. http://dx.doi.org/10.3329/jme.v43i1.15776.

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Porous carbon materials have attracted interest recently as they are potential candidates for largenumber of applications especially in catalytic supports, battery electrodes, capacitors, gas storage and biomedicalengineering applications. As porous carbons are mostly amorphous in nature, a little presence of sp2 carbonstructure enhances the possibility of using these carbon materials for wider applications involving electricalconductivity. Electrical conductivity of in porous acitivated carbon is increased by doping a suitable metal ion. Ricehusk char is choosen in this study as precursor for preparation of conducting carbon. The produced conductingcarbon exibits p-type semiconductor in character when copper, nickle, zinc and silver ions are doped. The highestelectricaal conductivity of silver ion doped material is found to be 2.84x10-2 mho/cm at 60% of ion concentration ofdoping solution. The results of this study conclude that rice husk char could be used for producing conductingcarbon and silver ion is the better among other doping materials used.DOI: http://dx.doi.org/10.3329/jme.v43i1.15776
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Mestre, Ana S., and Ana P. Carvalho. "Photocatalytic Degradation of Pharmaceuticals Carbamazepine, Diclofenac, and Sulfamethoxazole by Semiconductor and Carbon Materials: A Review." Molecules 24, no. 20 (October 15, 2019): 3702. http://dx.doi.org/10.3390/molecules24203702.

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The presence of pharmaceutical compounds in the environment is a reality that calls for more efficient water treatment technologies. Photocatalysis is a powerful technology available but the high energy costs associated with the use of UV irradiation hinder its large scale implementation. More sustainable and cheaper photocatalytic processes can be achieved by improving the sunlight harvesting and the synthesis of semiconductor/carbon composites has proved to be a promising strategy. Carbamazepine, diclofenac, and sulfamethoxazole were selected as target pharmaceuticals due to their recalcitrant behavior during conventional wastewater treatment and persistence in the environment, as properly reviewed. The literature data on the photocatalytic removal of carbamazepine, diclofenac, and sulfamethoxazole by semiconductor/carbon materials was critically revised to highlight the role of the carbon in the enhanced semiconductor performance under solar irradiation. Generally it was demonstrated that carbon materials induce red-shift absorption and they contribute to more effective charge separation, thus improving the composite photoactivity. Carbon was added as a dopant (C-doping) or as support or doping materials (i.e., nanoporous carbons, carbon nanotubes (CNTs), graphene, and derived materials, carbon quantum dots (CQDs), and biochars) and in the large majority of the cases, TiO2 was the semiconductor tested. The specific role of carbon materials is dependent on their properties but even the more amorphous forms, like nanoporous carbons or biochars, allow to prepare composites with improved properties compared to the bare semiconductor. The self-photocatalytic activity of the carbon materials was also reported and should be further explored. The removal and mineralization rates, as well as degradation pathways and toxicity of the treated solutions were also critically analyzed.
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Zhou, Jin, and Shu Ping Zhuo. "Capacitive Performance of Ordered Mesoporous Carbons in Ionic Liquids." Advanced Materials Research 284-286 (July 2011): 2086–89. http://dx.doi.org/10.4028/www.scientific.net/amr.284-286.2086.

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Ordered mesoporous carbons (BOMC) were prepared by doping boric acid using a hard-templating method, while a CMK-3 carbon (OMC) was also prepared for comparison. The capacitive performance of these two carbons was investigated in ionic liquid of EMImBF4 and EMImTSFI. As demonstrated by the structure analysis, BOMC possesses almost same surface area and pore size as OMC, while the former carbon possesses higher content of oxygen-containing groups. In ionic liquid electrolyte, the carbons mainly show typical electric double layer capacitance, and the capacitance retention ratio and ion diffusion of electrolyte is determined to the surface chemical property. BOMC present visible pseudo-capacitance due to the oxygenated groups in hydrophilic EMImBF4, while no visible pseudo-capacitive behavior was observed in hydrophobic EMImTSFI.
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Priyono, Slamet. "The Effect of Al2O3 Doped and Carbon Coated Li4Ti5O12 on Structures, Morphology and Electrochemical Performance." Journal of Technomaterials Physics 2, no. 1 (February 28, 2020): 57–62. http://dx.doi.org/10.32734/jotp.v2i1.5266.

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In this research, Li4Ti5O12 anode with doping Al2O3 and carbon coating was made to determine the effect of doping Al2O3 and carbon coating on crystal structure, morphology and electrochemical performance. Li4Ti5O12 anode material consisting of LiOH.H2O and TiO2 was made with various samples of LTO without doping, LTO doped carbon, LTO doping Al2O3 and carbon using the solid state reaction method. All raw materials are mixed and milled using a Planetary Ball Miller for 2 hours then crushed to become a precursor to Li4Ti5O12. The Li4Ti5O12 precursor was sintered at 850°C for 4 hours. The final product was characterized using X-Ray Diffraction (XRD) to determine the formation of Li4Ti5O12 phases, Scanning Electron Microscopy (SEM) to analyze the morphology formed, and Cyclic Voltammetry to determine electrochemical performance. The results of XRD characterization were formed in the Lithium Titanium Oxide (Li4Ti5O12), Dilithium Titanate (Li2TiO3), and Rutile (TiO2) phases. The SEM characterization results on LTO doping carbon, LTO doping Al2O3 and carbon showed a coarser texture compared to the LTO without doping which had a fine texture. The electrochemical performance produced in LTO coating carbon has a slender redox peak in the first cycle, this shows that LTO coating carbon has good electrochemical performance compared to the Al2O3 and carbon doping LTO samples.
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Lázaro, M. J., C. Alegre, M. J. Nieto-Monge, D. Sebastián, M. E. Gálvez, E. Pastor, and R. Moliner. "Nitrogen Doped and Functionalized Carbon Materials as Supports for Catalysts in Electro-Oxidation of Methanol." Advances in Science and Technology 93 (October 2014): 41–49. http://dx.doi.org/10.4028/www.scientific.net/ast.93.41.

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The objective of this work is to study the behavior of Nitrogen-doped carbons as supports of catalysts for the electro-oxidation of methanol. Two carbon materials have been considered: a) carbon xerogels (CXG), highly mesoporous, whose porosity and pore size distribution are easily performed during the synthesis method; b) carbon nanofibers (CNF), which have a high electrical conductivity, good behavior in high temperature conditions and resistance to acid/basic media. Meanwhile, a commercial carbon black (Vulcan XC72R) which is commonly used in manufacturing of electrocatalysts fuel cells was used for comparison. Nitrogen was introduced into the CXG during the synthesis process, what is commonly referred as doping, by including melamine as a reactant. In contrast, N-groups were created over CNF by post-treatment with: ammonia (25%), urea (98%), melamine (99%) and ethylenediamine (99.5%), with a carbon: nitrogen molar ratio 1:0.6. N-containing carbon materials were characterized by elemental analysis, nitrogen adsorption, X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), SEM-EDX and TEM to determinate the amount and forms of nitrogen introduced. Pt-catalysts were prepared by the microemulsion method. The influence of the nitrogen doping and functionalization on the catalytic behavior in the electrochemical oxidation of methanol was evaluated by different physicochemical and electrochemical analysis.
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Bandosz, Teresa J. "Beyond Adsorption: The Effect of Sulfur Doping on Emerging Applications of Nanoporous Carbons." Eurasian Chemico-Technological Journal 18, no. 4 (February 18, 2017): 233. http://dx.doi.org/10.18321/ectj466.

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<p>Recently we have directed our attention to new applications of “old” materials, nanoporous carbons, as photocatalysts for oxidation of dibenzothiophenes, as water splitting catalysts, as gas sensors and as photosensitizers. Our inspiration was in graphene science. We found that both surface chemistry and porosity are crucial factors determining the specific performance. Since the effects are synergistic, it is not possible to totally separate the influence of these two factors. In terms of photoactivity and photosensitivity, surface chemistry was found as having the predominant effect on the catalytic performance. Sulfur containing groups were indicated as playing a major role in these processes. Of course physical adsorption was necessary to take place on the surface before further reactions promoted by absorption of photons occurred. Since some level of conductivity of the carbon matrix is important for an electron transfer, formation of radicals, and active oxygen species, the presence of sp<sup>2</sup> graphitic dots of 10 nm in size in the carbon matrix enhanced the photoactive performance. In the case of gas sensing where the reversibility of the signal is important, physical adsorption was a predominant factor. Here the specific polar or electrostatic interactions enhance the sensitivity and affect markedly the selectivity. A minireview of our recent work on these two emerging topics, photoactivity of carbon and their sensing application, is presented in this paper. The emphasis is on the importance of both, specific surface chemistry and developed porosity. The latter is a unique factor, which differentiates the performance of porous carbons from that of nanoforms of carbons such as graphene or carbon nanotubes.</p><p> </p><p><strong>Keywords:</strong></p><p><strong> </strong>nanoporous carbon, photoactivity, catalytic oxidations, water splitting,<br />gas sensing, surface chemistry, porosity, photosensitivity</p>
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Reis, Glaydson Simões dos, Helinando Pequeno de Oliveira, Sylvia H. Larsson, Mikael Thyrel, and Eder Claudio Lima. "A Short Review on the Electrochemical Performance of Hierarchical and Nitrogen-Doped Activated Biocarbon-Based Electrodes for Supercapacitors." Nanomaterials 11, no. 2 (February 7, 2021): 424. http://dx.doi.org/10.3390/nano11020424.

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Cheap and efficient carbon electrodes (CEs) for energy storage systems (ESS) such as supercapacitors (SCs) and batteries are an increasing priority issue, among other things, due to a globally increasing share of intermittent electricity production (solar and wind) and electrification of transport. The increasing consumption of portable and non-portable electronic devices justifies research that enables environmentally and economically sustainable production (materials, processing techniques, and product design) of products with a high electrochemical performance at an acceptable cost. Among all the currently explored CEs materials, biomass-based activated carbons (AC) present enormous potential due to their availability and low-cost, easy processing methods, physicochemical stability, and methods for self-doping. Nitrogen doping methods in CEs for SCs have been demonstrated to enhance its conductivities, surface wettability, and induced pseudocapacitance effect, thereby delivering improved energy/power densities with versatile properties. Herein, a short review is presented, focusing on the different types of natural carbon sources for preparing CEs towards the fabrication of SCs with high electrochemical performance. The influences of ACs’ pore characteristics (micro and mesoporosity) and nitrogen doping on the overall electrochemical performance (EP) are addressed.
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Dissertations / Theses on the topic "Carbon dopin"

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Wang, Qingyang. "Fabrication et propriétés physiques de conducteurs multifilamentaires MgB2 dopés au carbone." Phd thesis, Université de Grenoble, 2012. http://tel.archives-ouvertes.fr/tel-00950672.

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Des conducteurs mono- et multi-filamentaires de MgB2 dans une gaine de Nb/Cu ont été élaborés par la technique PIT (powder in tube) avec des dopages de carbone et de TiC. Les résultats montrent qu'il y a une couche de diffusion non supraconductrice à l'interface entre le Nb et MgB2 pour les échantillons traités à haute température, couche qui empêche la pénétration du courant dans le conducteur. Les traitements thermiques doivent être inférieurs à 750°C. Les effets des dopages au carbone amorphe et au TiC ont été étudiés par XRD,MEB et aimantation. La substitution du bore par du carbone diminue légèrement la Tc mais augmente la piégeage des vortex, conduisant à un optimum du courant critique. Des multi-filaments de 6, 12 et 36 filaments sans dopage ont été élaborés par la technique PIT. Les propriétés mécaniques de ces conducteurs ont été renforcées en utilisant un filament central en Nb. L'assemblage MgB2/Nb/Cu est très adapté pour obtenir de grandes longueurs de conducteurs par la méthode PIT.
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Kleinsorge, Britta Yvonne. "Doping of amorphous carbon." Thesis, University of Cambridge, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.621744.

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RIBEIRO, MARIO LUIS PIRES GONCALVES. "CARBON DOPING IN INAIAS EPITAXIAL LAYERS." PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIRO, 2002. http://www.maxwell.vrac.puc-rio.br/Busca_etds.php?strSecao=resultado&nrSeq=2651@1.

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COORDENAÇÃO DE APERFEIÇOAMENTO DO PESSOAL DE ENSINO SUPERIOR
ERICSSON DO BRASIL
É reconhecido o potencial de usar carbono como um dopante tipo p em InAlAs devido a obtenção de elevados níveis de dopagem [1,2]. Entretanto, níveis elevados de dopagem só são alcançados em baixas temperaturas de crescimento (Tg inferiores a 600°C). Nessas temperaturas, as camadas crescidas apresentam qualidade ótica inferior quando comparadas com camadas crescidas em temperaturas mais altas, o que é prejudicial para dispositivos de optoeletrônica. Neste trabalho, é apresentada uma investigação sistemática das propriedades de transporte e óticas em camadas de InAlAs dopadas com carbono para diferentes temperaturas de crescimento. É observado que quanto mais baixa for a Tg maior será a incorporação de carbono e maior a atividade elétrica. Este resultado indica que o carbono é incorporado de diversas maneiras, bem como um aceitador raso. O carbono também pode ser incorporado como um doador raso, pois é um dopante anfotérico. Entretanto, este fato, não é suficiente para explicar os resultados de transporte. A diferença entre a concentração Hall e a concentração CV indica a incorporação de doadores profundos. Provavelmente, o carbono participa na formação desses doadores profundos, uma vez que a concentração de doador profundo varia linearmente com a densidade atômica de carbono, determinada pela técnica SIMS. Por outro lado, centros não radiativos são mais facilmente incorporados em baixas Tg e a eficiência da fotoluminescência é reduzida. Essa degradação da fotoluminescência é independente da concentração de carbono, consequentemente, pode-se concluir que essa redução na eficiência da fotoluminescência não está associada à presença de doadores profundos. Com a finalidade de obter um incremento na atividade elétrica do carbono e melhoria na qualidade ótica das camadas, as amostras foram submetidas a tratamentos térmicos. Os tratamentos térmicos aumentaram a concentração de buracos mas não influenciaram na densidade de doadores profundos ou na qualidade ótica das camadas. Para a utilização de InAlAs dopado com carbono em dispositivos, deve-se obter simultaneamente uma boa qualidade ótica e elevada atividade elétrica das camadas.Então, deve-se identificar o doador profundo, que está associado ao carbono, com o objetivo de reduzí-lo ou eliminá-lo e consequentemente, obter um incremento na atividade elétrica das camadas. Desta forma as camadas podem ser crescidas a temperaturas mais altas adequadas para uma emissão de fotoluminescência eficiente. Cálculos teóricos são apresentados de modo a ajudar essa identificação. Outra possibilidade é usar diferentes fontes de arsina em que as moléculas se dissociem em temperaturas mais baixas.
The potential of using carbon as a p-type dopant for InAlAs has already been recognized due to the achievable high hole concentration [1,2]. However, high doping levels are reached only for low growth teperatures (Tg below 600°C). These temperatures produce layers with poor optical quality as compared to those grown at higher temperatures, which can be detrimental for optoeletronic device. In this work we present crystal, transport and optical properties of such layers grown at different temperatures. We find that the lower Tg, the more efficient the carbon incorporation and its electrical activity are. This result indicates that carbon is incorporated in forms different from a shallow acceptor, as well. Carbon can also be incorporated as a shallow donor since it is an amphoteric dopant. However, this alone does not explain the transport results. The difference between the net free charge density determined from capacitance measurements indicates that a deep donor is also incorporated. Carbon most likely participates in the deep donor formation since the inferred deep donor concentration varies linearly with the carbon atomic density measured by SIMS. On the other hand, non- radiative deep levels are more efficiently incorporated as Tg is reduced degrading the photoluminescence characteristics. Such degration is independent of the carbon doping. Therefore, one concludes that the decrease in the photoluminescence efficiency cannot be related to the presence of the deep donor mentioned in the previous paragraph. To further probe the carbon electrical activity and its effect on the optical properties of the layers, the samples have been subjected to a heat-treatment. Annealing the samples increases the hole concentration, but neither affects the deep donor density nor improves the layers optical quality. In order to use carbon doped InAlAs in devices which simultaneously require good optical quality and high electrical activity of the layers, one should identify the deep donor involving carbon in order to try to reduce its concentration or even eliminate it, consequently improving the electrical activity of the layers. In such a way the layers can be grown at higher temperatures, adequate for an efficient photoluminescence emission. Theoretical calculations are being carried out to help with such identification. Another possibility is to use other arsine sources which crack at lower temperatures.
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Alluqmani, Saleh Marzoq B. "Growth and doping of carbon nanotubes and graphene." Thesis, Durham University, 2015. http://etheses.dur.ac.uk/10949/.

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Single walled carbon nanotubes (SWCNTs) have been doped with nitrogen (N) by two ion-mediated approaches: directly through irradiation with N+ ions and by a novel indirect technique, creating defects through Ar+ ion irradiation which then react with nitrogen upon annealing in a N2 atmosphere. X-ray photoelectron spectroscopy (XPS) was then employed to determine the chemical environment of the nitrogen within the resulting SWCNT material. Depending upon the exact preparation conditions, nitrogen in graphitic (substitutional) pyridinic and pyrrolic configurations could be identified. Nitrogen doping through the novel method was found to introduce the largest concentration of chemisorbed nitrogen within the SWCNT films, dominated by thermodynamically unstable pyrrolic species at low process temperatures (500ºC). The maximum concentration of nitrogen in graphitic sites was achieved by direct ion bombardment, although both XPS and Raman spectroscopy indicated that this approach to doping led to the greatest damage. The ability to vary both bsolute and relative composition of chemisorbed nitrogen species is expected to be valuable for a range of fundamental studies, particularly of the catalytic behaviour of these materials. The growth of graphene on copper under atmospheric pressure using a soft solid source (nonadecane) is reported. It is found that the growth rate is best described by a model which involves the continuous supply of reactive species during the entire growth period. This observation is explained in terms of the formation of decomposition produces which reside on an otherwise clean surface after nonadecane desorption and provide a series of ‘mini carbon sources’ for graphene growth. XPS analysis indicates that, as expected, increased growth temperature leads to greater graphitisation at the surface (and hence graphene ‘quality’) which is not accompanied by any substantial change in island size and coverage. It is found that although graphene islands can be produced it is not possible to form continuous films, demonstrating the limitations of this technique. Although limited in some ways, the use of soft solid precursors for graphene growth allows the ready introduction of potential dopant materials. XPS, Raman and SEM data provide strong evidence that a PDMS precursor can be employed in atmospheric pressure solid-phase CVD to produce graphene heavily doped with silicon, which has not been previously achieved. Since silicon-doped graphene is predicted to possess a band gap related to the Si concentration, this may provide a route to produce a graphene-based material of use in digital electronics.
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Sanwick, Alexis. "Heteroatom-Doped Chemical Vapor Deposition Carbon Ultramicroelectrodes." Digital Commons @ East Tennessee State University, 2020. https://dc.etsu.edu/honors/592.

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Metal nanoparticles have been a primary focus in areas of catalysis and electrocatalysis applications as a result of their large surface area-to-volume ratios. While there is an increased interest in understanding the properties and behaviors of metal nanoparticles, they can become expensive over time. Recent research has incorporated the idea of using heteroatom-doped materials as a cheaper catalytic alternative to metal nanoparticles. In this study nitrogen-doping and phosphorous-doping techniques were applied to chemical vapor-deposited carbon ultramicroelectrodes in order to study the electrocatalytic properties toward the oxygen reduction reaction and the enhanced affinity for the deposition of gold nanoparticles onto the electrodes.
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Liang, Meng Suan. "Carbon doping in GaAs, AlGaAs, InGaAs and distributed Bragg reflectors." Thesis, University of Liverpool, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.399255.

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Sojoudi, Hossein. "The synthesis, doping, and characterization of graphene films." Diss., Georgia Institute of Technology, 2012. http://hdl.handle.net/1853/50125.

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Graphene, a two-dimensional counterpart of three-dimensional graphite, has attracted significant interest, due to its distinctive electrical and mechanical properties, for developing electronic, optoelectronic, and sensor technologies. In general, doping of graphene is important, as it gives rise to p-type and n-type materials, and it adjusts the work function of the graphene. This adjustment is necessary in order to control charge injection and collection in devices such as solar cells and light emitting devices. Current methods for graphene doping involve high temperature process or interactions with chemicals that are not stable. Moreover, the process of transferring graphene from its growth substrate and its exposure to the environment results in a host of chemical groups that can become attached to the film and alter its electronic properties by accepting or donating electrons/holes. Intentional and controllable doping of the graphene, however, requires a deeper understanding of the impact of these groups. The proposed research will attempt to clarify the unintentional doping mechanism in graphene through adsorption or desorption of gas/vapor molecules found in standard environments. A low temperature, controllable and defect-free method for doping graphene layers will also be studied through modifying the interface of graphene and its support substrate with self-assembled monolayers (SAMs) which changes the work function and charge carriers in the graphene layer. Furthermore, current methods of chemical vapor deposition synthesis of graphene requires the film to be transferred onto a second substrate when the metal layer used for growth is not compatible with device fabrication or operation. To address this issue, the proposed work will investigate a new method for wafer scale, transfer-free synthesis of graphene on dielectric substrates using new carbon sources. This technique allows patterned synthesis on the target substrate and is compatible with standard device fabrication technologies; hence, it opens a new pathway for low cost, large area synthesis of graphene films.
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Pinto, Hugo Manuel. "Defects and dopants in carbon related materials." Thesis, University of Exeter, 2012. http://hdl.handle.net/10036/3601.

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This thesis presents theoretical studies of the optical and electronic properties of defects in diamond and of the mechanisms of doping graphene. The birefringence of the four petalled defect commonly observed in CVD diamond is explained by four linear arrays of dislocations along ⟨110⟩ directions with ⟨110⟩ Burgers vectors. Such an arrangement of dislocations reproduces the extension and the features of the birefringence patterns observed experimentally. Density functional theory via the AIMPRO code was used to study the electronic and optical properties of different nitrogen-related point defects in diamond. It was found that the zero-phonon luminescence line of the NV− defects can split in the presence of a surface or other NV− defects. Since VNH and VN2 are expected to have similar optical properties, the optical transi- tions for VN2 were used to correct the transitions for VNH calculated by local density approximation. The absorption band at 2.38 eV (520 nm) observed in CVD diamond is then attributed to an internal transition of VNH. The weak zero-phonon line and broad vibronic sidebands for VN− and VN−2 and its absence for VNH− is explained by the large structural change when the defect is excited. Finally, different mechanisms for doping graphene were considered. The calculations predict the electropositive metals, such as Ti and Cr, act as donors, while molecules with strong electron affinity, such as F4-TCNQ, act as acceptors in graphene. An unexpected mechanism of doping graphene was shown by Au which dopes bilayer graphene but not single layer. In the presence of water, electrochemical reactions on the graphene can also lead to p or n-type doping.
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Ashourirad, Babak. "HETEROATOM-DOPED NANOPOROUS CARBONS: SYNTHESIS, CHARACTERIZATION AND APPLICATION TO GAS STORAGE AND SEPARATION." VCU Scholars Compass, 2015. http://scholarscompass.vcu.edu/etd/4062.

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Activated carbons as emerging classes of porous materials have gained tremendous attention because of their versatile applications such as gas storage/separations sorbents, oxygen reduction reaction (ORR) catalysts and supercapacitor electrodes. This diversity originates from fascinating features such as low-cost, lightweight, thermal, chemical and physical stability as well as adjustable textural properties. More interestingly, sole heteroatom or combinations of various elements can be doped into their framework to modify the surface chemistry. Among all dopants, nitrogen as the most frequently used element, induces basicity and charge delocalization into the carbon network and enhances selective adsorption of CO2. Transformation of a task-specific and single source precursor to heteroatom-doped carbon through a one-step activation process is considered a novel and efficient strategy. With these considerations in mind, we developed multiple series of heteroatom doped porous carbons by using nitrogen containing carbon precursors. Benzimidazole-linked polymers (BILP-5), benzimidazole monomer (BI) and azo-linked polymers (ALP-6) were successfully transformed into heteroatom-doped carbons through chemical activation by potassium hydroxide. Alternative activation by zinc chloride and direct heating was also applied to ALP-6. The controlled activation/carbonization process afforded diverse textural properties, adjustable heteroatom doping levels and remarkable gas sorption properties. Nitrogen isotherms at 77 K revealed that micropores dominate the porous structure of carbons. The highest Brunauer-Emett-Teller (BET) surface area (4171 m2 g-1) and pore volume (2.3 cm3 g-1) were obtained for carbon synthesized by KOH activation of BI at 700 °C. In light of the synergistic effect of basic heteroatoms and fine micropores, all carbons exhibit remarkable gas capture and selectivity. Particularly, BI and BIPL-5 derived carbons feature unprecedented CO2 uptakes of 6.2 mmol g-1 (1 bar) and 2.1 mmol g-1 (0.15 bar) at 298 K, respectively. The ALP-6 derived carbons retained considerable amount of nitrogen dopants (up to 14.4 wt%) after heat treatment owing to the presence of more stable nitrogen-nitrogen bonds compared to nitrogen-carbon bonds in BILP-5 and BI precursors. Subsequently, the highest selectivity of 62 for CO2/N2 and 11 for CO2/CH4 were obtained at 298 K for a carbon prepared by KOH activation of ALP-6 at 500 °C.
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Anwar, Abdul Waheed. "Investigation of doping and photoexcitation in carbon nanotubes using Raman spectroscopy." Toulouse 3, 2011. http://thesesups.ups-tlse.fr/1156/.

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La spectroscopie Raman est une technique de caractérisation non destructive appropriée pour l'étude des nanotubes des carbone. Des différences dans le décalage spectral des bandes Raman D et G, correspondant aux effets anharmoniques, sont observées lors d'un chauffage des nanotubes de carbone par irradiation photonique intense ou en faisant varier la température d'un thermostat. Les modifications spectrales du mode D sont attribués à des modifications du processus de double résonance Raman en raison de la variation de la structure de bande électronique provoquée par la creation des excitons. L'enquête de l'influence du dopage et de photoexcitation sur la bande G et la D de nanotubes de carbone montrent que la spectroscopie Raman peut être utilisé comme un outil de diagnostic. Les bandes spectrales élargir et décale vers le haut fréquence pour l'azote dopé nanotubes de carbone multi parois. Le décalage vers le haut fréquence pour l'acide sulfurique dopé double parois nanotubes de carbone est attribuée à transfert de charge et la déformation dans le réseau. Nous avons combiné le dopage de l'acide sulfurique et haute pression spectroscopie Raman pour étudier les propriétés de DWCNT. Le DWCNT dopé avec différentes concentrations d'acide sulfurique sous haute pression, suggère un effet de l'ordre des molécules autour de nanotubes à concentrations d'acide supérieur. Spectres Raman de double parois nanotube de carbone individual sur la silice en évidence un éclatement de la bande G grâce aux contributions du tube interne et externe lorsque utilisez une énergie d'excitation en résonance avec le tube métallique interne et tube semionducteurs externe. Les largeurs des bandes sont comparables à ce qui a été observé pour le nanotube de carbone monoparoi individul ou le graphène. Augmentation de la puissance du laser décale la bande G du tube extérieur vers les énergies plus élevées et modifie sa forme en ligne
Raman spectroscopy is a non-invasive characterization technique suitable for the study of carbon nanotubes. Differences in the spectral shift of the Raman D and G bands are observed when heating carbon nanotubes through intense photon irradiation and by varying the temperature in a thermostat. These spectral changes in D mode are attributed to the variation of the electronic band structure by excitons creation. The investigation of the influence of doping and photoexcitation on the Raman G and D band of carbon nanotubes show that Raman spectroscopy can be used as a diagnostic tool. The spectral bands broaden and up shifts for nitrogen doped multi walled carbon nanotubes (MWCNT). The up shift for sulphuric acid doped double wall carbon nanotubes (DWCNT) synthesized from catalytic chemical vapor deposition method (CCVD) is attributed to charge transfer and strain in the lattice. We have combined sulphuric acid doping and high pressure Raman spectroscopy to investigate the properties of DWCNT. The DWCNT doped with different concentrations of sulphuric acid are explored under high pressure suggesting an effect of the molecular ordering around carbon nanotubes at higher acid concentrations. Raman spectra of individual double wall carbon nanotubes on silica show a splitting of the G band due to contributions of the inner and outer tube when using a excitation energy in resonance with the inner metallic tube and outer semiconducting tube. The spectral line widths are comparable to what has been observed for individual single wall carbon nanotubes (SWCNT) or graphene. Increased laser power shifts the G band of the outer tube to higher energies and modifies its line shape
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Books on the topic "Carbon dopin"

1

Bulyarskiy, Sergey, and Alexandr Saurov, eds. Doping of Carbon Nanotubes. Cham: Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-55883-7.

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Bulyarskiy, Sergey, and Alexandr Saurov. Doping of Carbon Nanotubes. Springer, 2018.

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Saito, R., A. Jorio, J. Jiang, K. Sasaki, G. Dresselhaus, and M. S. Dresselhaus. Optical properties of carbon nanotubes and nanographene. Edited by A. V. Narlikar and Y. Y. Fu. Oxford University Press, 2017. http://dx.doi.org/10.1093/oxfordhb/9780199533053.013.1.

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This article examines the optical properties of single-wall carbon nanotubes (SWNTs) and nanographene. It begins with an overview of the shape of graphene and nanotubes, along wit the use of Raman spectroscopy to study the structure and exciton physics of SWNTs. It then considers the basic definition of a carbon nanotube and graphene, focusing on the crystal structure of graphene and the electronic structure of SWNTs, before describing the experimental setup for confocal resonance Raman spectroscopy. It also discusses the process of resonance Raman scattering, double-resonance Raman scattering, and the Raman signals of a SWNT as well as the dispersion behavior of second-order Raman modes, the doping effect on the Kohn anomaly of phonons, and the elastic scattering of electrons and photons. The article concludes with an analysis of excitons in SWNTs and outlines future directions for research.
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Book chapters on the topic "Carbon dopin"

1

Saurov, Alexandr. "Adsorption and Doping as Methods for the Electronic Regulation Properties of Carbon Nanotubes." In Doping of Carbon Nanotubes, 1–6. Cham: Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-55883-7_1.

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Bulyarskiy, Sergey, and Alexandr S. Basaev. "Thermodynamics and Kinetics of Adsorption and Doping of a Graphene Plane of Carbon nanotubes and Graphene." In Doping of Carbon Nanotubes, 7–56. Cham: Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-55883-7_2.

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Bulyarskiy, Sergey, Alexandr S. Basaev, and Darya A. Bogdanova. "Interaction of Hydrogen with a Graphene Plane of Carbon Nanotubes and Graphene." In Doping of Carbon Nanotubes, 57–101. Cham: Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-55883-7_3.

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Bulyarskiy, Sergey, Alexandr S. Basaev, Darya A. Bogdanova, and Alexandr Pavlov. "Oxygen Interaction with Electronic Nanotubes." In Doping of Carbon Nanotubes, 103–13. Cham: Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-55883-7_4.

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Saurov, Alexandr, Sergey Bulyarskiy, Darya A. Bogdanova, and Alexandr Pavlov. "Nitrogen Interaction with Carbon Nanotubes: Adsorption and Doping." In Doping of Carbon Nanotubes, 115–69. Cham: Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-55883-7_5.

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Saurov, Alexandr, Sergey Bulyarskiy, and Alexandr Pavlov. "Carbon Nanotube Doping by Acceptors. The p–п Junction Formation." In Doping of Carbon Nanotubes, 171–82. Cham: Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-55883-7_6.

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Susi, Toma, and Paola Ayala. "Doping Carbon Nanomaterials with Heteroatoms." In Carbon Nanomaterials for Advanced Energy Systems, 133–61. Hoboken, NJ: John Wiley & Sons, Inc, 2015. http://dx.doi.org/10.1002/9781118980989.ch4.

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Hu, Yating. "Nitrogen Doping of Mesoporous Carbon Materials." In Springer Theses, 35–47. Singapore: Springer Singapore, 2018. http://dx.doi.org/10.1007/978-981-10-8342-6_3.

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Mitura, Stanisław, Jan Szmidt, and Aleksandra Sokołowska. "Doping of Diamond-Like Carbon Films." In Wide Band Gap Electronic Materials, 235–42. Dordrecht: Springer Netherlands, 1995. http://dx.doi.org/10.1007/978-94-011-0173-8_23.

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Hatakeyama, Rikizo, Toshiaki Kato, Yongfeng Li, and Toshiro Kaneko. "Plasma Doping Processes for CNT Devices." In Frontiers of Graphene and Carbon Nanotubes, 143–63. Tokyo: Springer Japan, 2015. http://dx.doi.org/10.1007/978-4-431-55372-4_11.

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Conference papers on the topic "Carbon dopin"

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O’Hayre, Ryan, Yingke Zhou, Robert Pasquarelli, Joe Berry, and David Ginley. "Enhancement of Pt-Based Catalysts via N-Doped Carbon Supports." In ASME 2008 3rd Energy Nanotechnology International Conference collocated with the Heat Transfer, Fluids Engineering, and Energy Sustainability Conferences. ASMEDC, 2008. http://dx.doi.org/10.1115/enic2008-53078.

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This study experimentally examines the enhancement of carbon supported Pt-based catalysts systems via nitrogen doping. It has been reported that nitrogen-containing carbons promote significant enhancement in Pt/C catalyst activity and durability with respect to the methanol oxidation and oxygen reduction reactions. In order to systematically investigate the effect of N-doping, in this work we have developed geometrically well-defined model catalytic systems consisting of tunable assemblies of Pt catalyst nanoparticles deposited onto both N-doped and undoped highly-oriented pyrolytic graphite (HOPG) substrates. N-doping was achieved via ion beam implantation, and Pt was electrodeposited from solutions of H2PtCl6 in aqueous HClO4. Morphology from scanning electron microscopy (SEM) and catalytic activity measurement from aqueous electrochemical analysis were utilized to examine the N-doping effects. The results strongly support the theory that doping nitrogen into a graphite support significantly affects both the morphology and behavior of the overlying Pt nanoparticles. In particular, nitrogen-doping was observed to cause a significant decrease in the average Pt nanoparticle size, an increase in the Pt nanoparticle dispersion, and a significant increase in catalytic activity for both methanol oxidation and oxygen reduction.
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Zhou, Yingke, Robert Pasquarelli, Joe Berry, David Ginley, and Ryan O’Hayre. "Improving PEM Fuel Cell Catalysts Using Nitrogen-Doped Carbon Supports." In ASME 2008 6th International Conference on Fuel Cell Science, Engineering and Technology. ASMEDC, 2008. http://dx.doi.org/10.1115/fuelcell2008-65172.

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This study experimentally examines the effect of nitrogen doping on the activity of Pt/C catalyst systems. The investigation was accomplished through the development of geometrically well-defined model catalytic systems consisting of tunable assemblies of Pt catalyst nanoparticles deposited onto both N-doped and undoped highly-oriented pyrolytic graphite (HOPG) substrates. N-doping was achieved via ion beam implantation, and Pt was electrodeposited from solutions of H2PtCl6 in aqueous HClO4. Morphology from scanning electron microscopy (SEM) and catalytic activity measurement from aqueous electrochemical analysis were utilized to examine the N-doping effects. The results strongly support the theory that doping nitrogen into a graphite support significantly affects both the morphology and behavior of the overlying Pt nanoparticles. In particular, nitrogen-doping was observed to cause a significant decrease in the average Pt nanoparticle size, an increase in the Pt nanoparticle dispersion, and a significant increase in catalytic activity for both methanol oxidation and oxygen reduction.
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Czerw, R. "Substitutional Doping of Carbon Nanotubes." In STRUCTURAL AND ELECTRONIC PROPERTIES OF MOLECULAR NANOSTRUCTURES: XVI International Winterschool on Electronic Properties of Novel Materials. AIP, 2002. http://dx.doi.org/10.1063/1.1514080.

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Young Hee Lee. "Carbon nanotube transistor: Doping and ambipolarity." In 8th International Vacuum Electron Sources Conference and Nanocarbon (2010 IVESC). IEEE, 2010. http://dx.doi.org/10.1109/ivesc.2010.5644345.

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Armandi, Marco, Barbara Bonelli, and Edoardo Garrone. "Synthesis and Characterization of Mesoporous and Microporous Carbons With Potential Applications as Hydrogen Storage Media." In ASME 8th Biennial Conference on Engineering Systems Design and Analysis. ASMEDC, 2006. http://dx.doi.org/10.1115/esda2006-95740.

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The preparation and physico-chemical characterization of mesoporous and microporous carbons, obtained via a casting procedure, from a SBA-15 silica and a commercial Na-Y zeolite, is reported. XRD spectra showed that ordered carbon replicas occur in all cases. Micro-Raman spectra showed that rather homogeneous powders are obtained, exhibiting the presence of a graphitized carbon phase of small imperfect graphene sheets, typical of sp2 C, along with an amorphous one, notwithstanding the relatively low temperature adopted during the carbonization processes (1173 K). N2 adsorption isotherms at 77 K allowed the determination of BET surface areas and pore volumes: on account of the high porosity and the low specific weight, with respect to zeolites, for example, these carbon materials could be promising media for hydrogen storage. They could be used as such, or after convenient functionalization or metal doping.
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Haddad, H., L. Forbes, P. Burke, and W. Richling. "Carbon Doping Effects on Hot Electron Trapping." In 28th International Reliability Physics Symposium. IEEE, 1990. http://dx.doi.org/10.1109/irps.1990.363535.

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Knoch, Joachim, Thomas Grap, and Marcel Muller. "Gate-controlled doping in carbon-based FETs." In 2013 IFIP/IEEE 21st International Conference on Very Large Scale Integration (VLSI-SoC). IEEE, 2013. http://dx.doi.org/10.1109/vlsi-soc.2013.6673269.

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Han, Baoguo, Xun Yu, and Jinping Ou. "Effects of CNT Doping Level and Water/Cement Ratio on the Piezoresistivity of CNTS/Cement Composites." In ASME 2010 Conference on Smart Materials, Adaptive Structures and Intelligent Systems. ASMEDC, 2010. http://dx.doi.org/10.1115/smasis2010-3629.

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The carbon nanotubes (CNTs)/cement composites with different doping levels of multi-walled carbon nanotubes (MWNTs) and water/cement ratios are fabricated. By comparing the responses of electrical resistance of these CNTs/cement composites to compressive stress, the effects of MWNT doping level and water/cement ratio on the piezoresistive sensitivity of composites are investigated. Experimental results indicate that the piezoresistive sensitivities of CNTs/cement composites with 0.05 wt. %, 0.1 wt. % and 1 wt. % of MWNTs firstly increase and then decrease with the increase of CNT doping levels. The electrical resistance of CNTs/cement composites 0.6 water/cement ratio is more sensitive to compressive stress than that of composites with 0.45 water/cement ratio.
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Özmen, Yılmaz. "Tribological Behavior of Carbon Based Materials." In ASME 2015 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2015. http://dx.doi.org/10.1115/imece2015-50233.

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Diamond-like carbon (DLC) films have excellent tribological properties. These include low friction, high wear resistance, high corrosion resistance, and a high anti-seizure resistance. DLC film with and without Si doping (due to its promising effect on friction coefficient), at approximately 1–2 μm thickness, was synthesized by a reactive ion plating method using C6H6 source on WC-Co substrate. Si addition on tribological properties of DLC was evaluated. The effects of relative humidity and contact load are also investigated. When the Si content was increased above 5.9 at. %, tribological properties of the coating were deteriorated. These properties are, however, affected by film deposition parameters and sliding conditions such as normal load, sliding speed, mating materials, and atmospheric conditions. The effect of environment is particularly significant.
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Tian, Z., N. R. Quick, and A. Kar. "Laser doping of silicon carbon and pin diode fabrication." In ICALEO® 2004: 23rd International Congress on Laser Materials Processing and Laser Microfabrication. Laser Institute of America, 2004. http://dx.doi.org/10.2351/1.5060324.

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Reports on the topic "Carbon dopin"

1

Moll, Amy Jo. Carbon doping of III-V compound semiconductors. Office of Scientific and Technical Information (OSTI), September 1994. http://dx.doi.org/10.2172/10196996.

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Speck, James S. Systematic Studies of Carbon Doping in High Quality GaN Grown by Molecular Beam Epitaxy. Fort Belvoir, VA: Defense Technical Information Center, December 2004. http://dx.doi.org/10.21236/ada430009.

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Liu, Jie. Optimizing the Binding Energy of Hydrogen on Nanostructured Carbon Materials through Structure Control and Chemical Doping. Office of Scientific and Technical Information (OSTI), February 2011. http://dx.doi.org/10.2172/1004174.

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