Abstract
The electrochemical performances of hydrogen- and oxygen-terminated nano-crystalline diamond film electrodes were investigated by cyclic voltammetry and AC impedance spectroscopy. In addition, the surface morphologies, phase structures, and chemical states of the two diamond films were analysed by scanning probe microscopy, Raman spectroscopy, and X-ray photoelectron spectroscopy, respectively. The results indicated that the potential window is narrower for the hydrogen-terminated nano-crystalline diamond film than for the oxygen-terminated one. The diamond film resistance and capacitance of oxygen-terminated diamond film are much larger than those of the hydrogen-terminated diamond film, and the polarization resistances and double-layer capacitance corresponding to oxygen-terminated diamond film are both one order of magnitude larger than those corresponding to the hydrogen-terminated diamond film. The electrochemical behaviours of the two diamond film electrodes are discussed.
Highlights
Diamond film has many excellent physical and chemical properties such as a wide band gap, high corrosion resistance, high thermal conductivity, and wide optical transparency.[1]
The surface energy level bends downwards for OT diamond film compared to HT diamond film
The polarization resistance and double-layer capacitance of OT diamond surface are one order of magnitude larger than those of HT diamond film
Summary
Diamond film has many excellent physical and chemical properties such as a wide band gap, high corrosion resistance, high thermal conductivity, and wide optical transparency.[1]. According to some interesting findings, some novel MEMS units based on surface-terminated diamond films, such as field emission transistors, bio-sensors, and so on, have been developed in recent years.[7,8,9] the electrochemical performances of the different surface-terminated diamond films are clarified in previous studies, the detailed interface structures between the surface-terminated diamond film electrodes and the electrolytes remain unclear up to now. Hydrogen- and oxygen-terminated (abbreviated as HT and OT, respectively) nano-crystalline diamond films were prepared Their surface characterizations were performed by using scanning probe microscopy (SPM), Raman spectroscopy, and X-ray photoelectron spectroscopy (XPS). A frequency response analyser (FRA, Model 1250, EG&G) was used along with the potentiostat to investigate the impedance spectroscopy over a wide frequency range from 50 mHz to 1 MHz
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