Electrochemical properties of undoped CVD diamond films |
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Authors: | R Torz-Piotrowska K Fabisiak K Paprocki M Szybowicz E Staryga A Banaszak |
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Institution: | aUniversity of Technology and Life Sciences, Faculty of Chemical Technology and Engineering, Seminaryjna 3, 85-326 Bydgoszcz, Poland;bKazimierz Wielki University, Institute of Physics, Weyssenhoffa Sq. 11, 85- 072 Bydgoszcz, Poland;cPoznań University of Technology, Faculty of Technical Physics, Nieszawska 13A, 60-965 Poznań, Poland;dTechnical University of ?ód?, Institute of Physics, Wólczańska 219, 93-005 ?ód?, Poland |
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Abstract: | The electrochemical properties of undoped diamond polycrystalline films grown on tungsten wire substrates using methanol as a precursor are described. The diamond film quality was changed by introducing sp2-bonded non-diamond carbon impurity through adjustment of the methanol-to-hydrogen (C/H) source gas ratio used for diamond growth.The electrodes were characterized by Raman spectroscopy, scanning electronic microscopy (SEM) and cyclic voltammetry (CV).Diamond coated tungsten wires were then used as a working electrode to ascertain their electrochemical behavior in electrolytic medium. Electrochemical windows of these films were found to be suitable in the potential range of −2.5 V, +2.2 V] vs. Ag/AgCl in acid medium (0.1 M KCl).The electrochemical behavior was evaluated also using the Fe(CN)63−/4−redox couple.The results demonstrate that the grain boundaries and sp2-hybridized carbon impurity can have a significant influence on electrochemical window of undoped diamond electrodes. It was observed that with increasing sp2 carbon impurity concentration the electrochemical window decreases. |
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Keywords: | C Raman spectroscopy |
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