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Fabrication, characterization, and kinetic study of vertical single-crystalline CuO nanowires on Si substrates

Shao-Liang Cheng* and Ming-Feng Chen

Author Affiliations

Department of Chemical and Materials Engineering, National Central University, Chung-Li City, Taoyuan County, 32001, Taiwan, Republic of China

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Nanoscale Research Letters 2012, 7:119  doi:10.1186/1556-276X-7-119

Published: 13 February 2012

Abstract

We report here on the first study of the growth kinetics of high-yield, vertical CuO nanowires on silicon substrates produced by the process of thermal oxidation. The length of the CuO nanowires could be tuned from several to tens of micrometers by adjusting the oxidation temperature and time. The grown CuO nanowires were determined to be single-crystalline with different axial crystallographic orientations. After a series of scanning electron microscopy examinations, the average length of CuO nanowires produced at each temperature was found to follow a parabolic relationship with the oxidation time. The parabolic growth rate at different oxidation temperatures was measured. The activation energy for the growth of CuO nanowires calculated from an Arrhenius plot was found to be about 174.2 kJ/mole. In addition, the current-voltage characterization indicated that the sample with high-density CuO nanowires exhibited ohmic behavior, and its resistance was found to significantly decrease with increasing environmental temperature. The result can be attributed to an increase in the number of carriers at higher temperatures.

Keywords:
Cu film; thermal oxidation; CuO nanowire; growth kinetic; resistance