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		<doi>10.1016/j.tsf.2012.03.017</doi>
		<issn>0040-6090</issn>
		<citationkey>MedeirosCouMatBalFer:2012:MoStEl</citationkey>
		<title>Nanocrystalline diamond coating on carbon fibers produced at different temperatures: Morphological, structural and electrochemical study</title>
		<year>2012</year>
		<month>June</month>
		<secondarytype>PRE PI</secondarytype>
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		<author>Medeiros, L. I.,</author>
		<author>Couto, A. B.,</author>
		<author>Matsushima, J. T.,</author>
		<author>Baldan, M. R.,</author>
		<author>Ferreira, N. G.,</author>
		<group>LAS-CTE-INPE-MCTI-GOV-BR</group>
		<group>LAS-CTE-INPE-MCTI-GOV-BR</group>
		<group>LAS-CTE-INPE-MCTI-GOV-BR</group>
		<group>LAS-CTE-INPE-MCTI-GOV-BR</group>
		<group>LAS-CTE-INPE-MCTI-GOV-BR</group>
		<affiliation>Instituto Nacional de Pesquisas Espaciais (INPE)</affiliation>
		<affiliation>Instituto Nacional de Pesquisas Espaciais (INPE)</affiliation>
		<affiliation>Instituto Nacional de Pesquisas Espaciais (INPE)</affiliation>
		<affiliation>Instituto Nacional de Pesquisas Espaciais (INPE)</affiliation>
		<affiliation>Instituto Nacional de Pesquisas Espaciais (INPE)</affiliation>
		<journal>Thin Solid Films</journal>
		<volume>520</volume>
		<number>16</number>
		<pages>5277–5283</pages>
		<secondarymark>B2_ASTRONOMIA_/_FÍSICA B2_BIOTECNOLOGIA B1_CIÊNCIAS_BIOLÓGICAS_I B2_CIÊNCIAS_BIOLÓGICAS_II A1_ENGENHARIAS_II A2_ENGENHARIAS_III A1_ENGENHARIAS_IV C_ENSINO_DE_CIÊNCIAS_E_MATEMATICA A2_INTERDISCIPLINAR B1_MATERIAIS B1_MEDICINA_II B2_QUÍMICA</secondarymark>
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		<contenttype>External Contribution</contenttype>
		<versiontype>publisher</versiontype>
		<keywords>coating formation, crystallinities, diamond quality, diffractograms, electrochemical studies, electrode potentials, feed gas, film morphology, grain size, heat treatment temperature, nanocrystalline diamond coatings, nanocrystalline diamond films, nanocrystalline diamonds, NCD films, nucleation rate, raman scattering spectroscopy, redox couple, scanning electron microscopy image, Scherrer's equation, spectroscopy measurements, voltammetry measurements, X-ray diffraction measurements.</keywords>
		<abstract>In this paper, the morphological, structural and electrochemical properties of nanocrystalline diamond (NCD) films grown on carbon fibers (CF) were investigated. The CF substrates were produced at three different heat treatment temperatures (HTT):1000, 1500 and 2000 °C. The HTT variation promoted different organization indexes on the CF structures. Consequently, the NCD coating formation was strongly affected by the substrate HTT. The changes in the properties of the diamond films were discussed as a function of the film morphology evolution using CH4 flow rate of 0.25, 0.5 and 1.0 sccm in the feed gas. The X-ray diffraction measurements for the CF and NCD/CF composites were determinant to characterize the crystallinity of the NCD films as a function of the CF HTT and of the CH4 addition. Based on the diffractograms, the Scherrer's equation was applied to the (111) NCD peak, resulting in grain size values varying from 11.0 to 5.0 nm depending on the CH4 flow rate and on the CF HTT. The scanning electron microscopy images confirmed the deposition of a continuous NCD coating with high nucleation rate covering the whole CF, while their quality was analyzed by Raman spectroscopy measurements. The NCD grain agglomerates increased as a function of the increase in the CH4 flow rate from 0.25 to 1.0 sccm, showing similar film morphology to that of the unfaceted diamond balls obtained by chemical vapor deposition. This behavior confirmed the expected tendency by decreasing the diamond quality with the CH4 addition, especially for the films grown on CF treated at 1500 and 2000 °C. This performance was also corroborated by the cyclic voltammetry measurements concerning the electrode potential window and their responses in a redox couple.</abstract>
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		<language>en</language>
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