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.
[1] Wong E M, Bonevich J E, Searson P C. J. Phys. Chem. B, 1998, 102(40): 7770. [2] MEI Zeng-xia, ZHANG Xi-qing, WANG Zhi-jian, et al(梅增霞，张希清，王志坚，等). Spectroscopy and Spectral Analysis(光谱学与光谱分析), 2003, 23(3): 461. [3] Cozzoli P D, Curri L M, Agostiano A. J. Phys. Chem. B, 2003, 107(20): 4756. [4] Zhang X T, Liu Y C, Zhang L G，et al. J. Appl. Phys., 2002, 92(6): 3293. [5] Polarz S, Neues F J. Am. Chem. Soc., 2005, 127(34): 12028. [6] Yu P, Tang Z K, Wong G K，et al. 23rd. International Conference on the Physics of Semiconductor. Singapore: World Scientific, 1996. 1453. [7] Jing L, Xu Z, Shang J，et al. Materials Science and Engineering, 2002, A332: 356. [8] ZHANG Guo-qing, SUN Ping, XIONG Bo，et al(张国青，孙 萍，熊 波，等). Materials Science and Engineering(材料科学和工程学报)，2006, 24(2)：286. [9] Kayanuma Y. Physical Review B, 1988, 38(14): 9797. [10] Monticone S, Tufeu R, Kanaev A V. J. Phys. Chem. B, 1998, 102: 2854. [11] Wang Y, Herron N. J. Phys. Chem.，1991, 95(2): 525. [12] WANG Wen-liang, LI Dong-sheng, HOU Xiang-yang，et al (王文亮，李冬升，侯向阳，等). Chemical Research and Application(化学研究与应用)，2001, 13(2): 157. [13] ZHANG Li-de, MU Ji-mei(张立德，牟季美). Nanomaterials and Nanostructure(纳米材料和纳米结构). Beijing: Science Press(北京：科学出版社)，2001. 300. [14] Dingle R. Phys. Rev. Lett., 1969, 23(11): 579. [15] Bylander E G. J. Appl. Phys.，1978, 49(3): 1188. [16] Lin B, Fu Z, Jia Y. Appl. Phys. Lett., 2001, 79(7): 943. [17] Liu M, Kitai A H, Mascher P. J. Lumin.，1992, 54(1): 35. [18] Vanheusden K, Seager C H, Warren W L，et al. Appl. Phys. Lett., 1996, 68(3): 403. [19] VanDijken A, Meulenkamp Eric A, Vanmaekelbergh D，et al. J. Phys. Chem. B, 2000, 104(8): 1715. [20] CHEN You-cun, ZHANG Yuan-guang(陈友存，张元广). Spectroscopy and Spectral Analysis(光谱学与光谱分析), 2004, 24(9): 1032. [21] Kohan A F, Ceder G, Morgan D. Phys. Rev. B，2000, 61(22): 15019.
