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Cyclic voltammetry and impedance studies of undoped diamond films


The undoped, polycrystalline diamond films were deposited on tungsten wire substrates by hot filament chemical vapor deposition (HF CVD), using a precursor gas mixture of methanol with excess of hydrogen. The morphology and quality of the as-deposited films were monitored by scanning electron microscopy (SEM) and Raman spectroscopy. The surface morphology analyzed by SEM resembles a continuous and well faceted diamond film. Raman results showed essential differences in qualities of diamond films grown at different hydrocarbon concentrations. The electrochemical properties of diamond electrodes were examined with cyclic voltammetry (CV) and the electrochemical impedance spectroscopy (EIS). The CV experiments revealed a large chemical window (>∼4.3 V) of undoped diamond. Analysis of the ferrocyanide-ferricyanide couple at a diamond electrode suggests some extent of electrochemical quasi-reversibility, but the rates of charge transfer across the diamond substrate interface vary with diamond quality.

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Correspondence to K. Fabisiak.

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Mosińska, L., Kowalska, M., Popielarski, P. et al. Cyclic voltammetry and impedance studies of undoped diamond films. Mater Sci-Pol 31, 146–150 (2013).

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  • CVD diamond
  • Raman spectroscopy
  • cyclic voltammetry (CV)
  • electrochemical impedance spectroscopy (EIS)