کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
9812502 | 1518114 | 2005 | 6 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Electrochemical characterization of doped diamond-coated carbon fibers at different boron concentrations
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی مواد
فناوری نانو (نانو تکنولوژی)
پیش نمایش صفحه اول مقاله
![عکس صفحه اول مقاله: Electrochemical characterization of doped diamond-coated carbon fibers at different boron concentrations Electrochemical characterization of doped diamond-coated carbon fibers at different boron concentrations](/preview/png/9812502.png)
چکیده انگلیسی
Doped diamond films have been deposited on carbon fibers (felt) obtained from polyacrylonitrile at different levels of boron doping. For a successful coating of the fibers, an ultrasonic pretreatment in a bath of diamond powder dissolved in hexane was required. Films were grown on both sample sides, simultaneously, by hot filament-assisted chemical vapour deposition technique at 750 °C from a 0.5% H2/CH4 mixture at a total pressure of 6.5 Ã 103 Pa. Boron was obtained from H2 forced to pass through a bubbler containing B2O3 dissolved in methanol. The doping level studied corresponds to films with acceptor concentrations in the range of 6.5 Ã 1018 to 1.5 Ã 1021 cmâ 3, obtained from Mott-Schottky plots. Scanning electron microscopy analyses evidenced fibers totally covered with high quality polycrystalline boron-doped diamond film, also confirmed by Raman spectroscopy spectra. Diamond electrodes grown on carbon fibers demonstrated similar electrochemical behavior obtained from films on Si substrate, for ferri/ferrocyanide redox couple as a function of boron content. The boron content influences electrochemical surface area. A lower boron concentration provides a higher growth rate that results in a higher surface area.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Thin Solid Films - Volume 485, Issues 1â2, 1 August 2005, Pages 241-246
Journal: Thin Solid Films - Volume 485, Issues 1â2, 1 August 2005, Pages 241-246
نویسندگان
E.C. Almeida, A.V. Diniz, V.J. Trava-Airoldi, N.G. Ferreira,