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摘要
In this paper, the effect of substrate rotation at various rpm on the growth of ZnO nanorods using a hydrothermal method at different concentrations of precursor solution (0.025, 0.05 M) was investigated to easily control the size of ZnO nanorods. Scanning electron microscopy images showed that the length and size of the ZnO nanorods increased with increasing substrate rotation speed up to 100 rpm in the 0.025 M aqueous solution. In contrast, the ZnO nanorods were converted to a film form with substrate rotation in the 0.05 M aqueous solution. Photoluminescence spectra showed that the intensity of the near-band-edge and deep-level emission increased with substrate rotation in the 0.025 M aqueous solution, whereas they decreased in the 0.05 M aqueous solution. X-ray diffraction analysis showed an improvement in the c-axis orientation of the ZnO nanorods grown with substrate rotation. The absorbance increased with substrate rotation in the 0.025 M aqueous solution, while they decreased with substrate rotation in the 0.05 M aqueous solution. We expect that this method may offer efficient in situ way of mechanically tuning the size of ZnO nanorods, which enables optical and other properties of ZnO nanorod-based devices to be easily controlled.
- 出版日期2017-11
