光谱学与光谱分析 |
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Spectral Analysis of ZnO Nanocrystals |
SUN Ping, XIONG Bo, ZHANG Guo-qing, ZHU Bai-jin, DING Feng-lian |
Department of Physics, Beijing Normal University, Beijing 100875, China |
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Abstract ZnO nanocrystals with different size were prepared with deposition method at different annealing temperatures. The images of transmission electron microscopy show that the nanocrystals have a good dispersion characteristic, uniform shape, and centralized distribution. The X-ray diffraction spectra of samples show that the size and the crystallization of the nanocrystals increase as the annealing temperature grows. The peak positions of ultraviolet and visible spectra exhibit a blueshift as the crystal size decreases, which demonstrates the quantum confinement effect of ZnO nanocrystals. The infrared spectra present that there are a few residual ions adhering to the surface of ZnO nanocrystals. In addition, it was observed in the infrared spectra that the peaks at about 430 cm-1 shift to the red and become broader with the decrease in particle size. Two emission bands were clearly observed from the photoluminescence spectra of the samples. One is a relatively narrow emission band in the ultraviolet region (360 nm), while the other is a broad emission band in the visible region (468 nm). Compared with the theoretical calculation it is suggested that the latter originates from the zinc vacancies.
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Received: 2005-10-22
Accepted: 2006-01-22
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Corresponding Authors:
SUN Ping
E-mail: pingsun@bnu.edu.cn
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