Fabrication and Characterization of Diamond Quartz Crystal Microbalance Electrode

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Abstract
Boron-doped diamond film on a quartz crystal electrode was prepared by a reflow technique. The mass sensitivity of this diamond-quartz crystal microbalance (QCM) sensor was determined by performing Fe2+Fe2+ electrodeposition. This novel electrochemical QCM sensor was quite stable under several electrochemical experimental conditions. Its wide potential window and significantly low background current are just the same as the performance of a diamond electrode. We also showed that the fabricated diamond-QCM electrode worked satisfactorily as a useful tool for electrochemical microgravimetry by examining hydrogen evolution, oxygen evolution, and oxidation of the diamond surface in acidic solutions. It was found that evolved H2H2 inserted into the bulk of as-grown diamond with a storage volume of 0.06 mol/dm3 in 0.5 M HCl solution, after sweeping the potential from 0 to −3 V at a scan rate of 10 mV/s, in contrast to O-terminated diamond-QCM, which inhibited hydrogen intercalation. © 2002 The Electrochemical Society. All rights reserved.