1. Preparation, characterization and electrochemical properties of boron-doped diamond films on Nb substrates
- Author
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Jian Wang, Lingcong Meng, Fen Long, Shi-meng Hao, Zhi-ming Yu, and Qiuping Wei
- Subjects
Materials science ,Scanning electron microscope ,Material properties of diamond ,Metallurgy ,Doping ,Metals and Alloys ,Analytical chemistry ,Diamond ,Chemical vapor deposition ,engineering.material ,Geotechnical Engineering and Engineering Geology ,Condensed Matter Physics ,Indentation hardness ,symbols.namesake ,Electrode ,Materials Chemistry ,symbols ,engineering ,Raman spectroscopy - Abstract
A series of boron-doped polycrystalline diamond films were prepared by hot filament (HF) chemical vapor deposition on Nb substrates. The effects of B/C ratio of reaction gas on film morphology, growth rate, chemical bonding states, phase composition and electrochemical properties of each deposited sample were studied by scanning electron microscopy, Raman spectra, X-ray diffraction, microhardness indentation, and electrochemical analysis. Results show that the average grain size of diamond and the growth rate decrease with increasing the B/C ratio. The diamond films exhibit excellent adhesion under Vickers microhardness testing (9.8 N load). The sample with 2% B/C ratio has a wider potential window and a lower background current as well as a faster redox reaction rate in H2SO4solution and KFe(CN)6 redox system compared with other doping level electrodes.
- Published
- 2013
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