Abstract: Carbon nanotubes electrodes were prepared in the holes of glass directly by microwave plasma chemical vapor deposition. During the process of carbon nanotubes growth, the negative bias imposed on the substrate could improve the alignment of carbon nanotubes. The electrochemical behavior of CuSO₄ at the carbon nanotubes electrode was investigated. Compared to graphite electrode, carbon nanotubes had excellent electrochemical behavior for the analysis of Cu²⁺. The current had linearship with the Cu²⁺ concentration in the range of 0.01~0.30 mmol•L^-1, and the correlation coefficient was 0.9975. Because carbon nanotubes were integrated directly on the substrate, the stable response to Cu²⁺ solution showed that the carbon nanotubes electrodes had long-term stability.

Key words: Carbon nanotubes electrode, Electrochemical detection, Microwave plasma chemical vapor deposition