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Abstract
Undoped nanodiamond (ND) powders were coated with TiO 2 through two steps: firstly Ti lay was deposited by cycled vacuum-feeding chemical vapour deposition from gaseous TiCl 4/H 2, and secondly an oxidation treatment was carried out in air. The structure and the morphology of the TiO 2/ND composite were characterized by Raman spectrum and transmission electron microscopy. The electrochemical properties of the TiO 2/ND powder electrode in a solution containing [Fe(CN) 6] 3−/4 − or NO 2 − were investigated. The results showed that a continuous coating consisting of Ti nanoparticles covered on ND particle after the deposition. The following oxidation at 500 °C resulted in the formation of anatase phase TiO 2 nanoparticles of about 10 nm. The electrochemical results confirmed that the TiO 2/ND powder electrode exhibited higher electrochemical activity than the pristine ND electrode, especially higher catalytic ability toward the oxidation of nitrite anions. Moreover, the TiO 2/ND powder electrode presented fast response towards nitrite oxidation with a detection limit of 0.55 µM and a linear range of 0.05 to 1.0 mM.
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