微量水对ZnO胶体性质的影响

以甲醇为溶剂，在Ｚｎ＾２＋过量的情况下，用溶胶－凝胶法制备ＺｎＯ胶体，并着重研究微量水的加入对ＺｎＯ胶体粒径和性质的影响，结果表明，在制备过程中，加水量越大，所得ＺｎＯ胶粒粒径越大，因此，可通过加水量来控制ＺｎＯ胶粒的大小，而加水量对ＺｎＯ胶体性质，如ＰＨ值、吸收光谱和荧光光谱有影响，讨论荧光产生的机理和加水量对荧光强度的影响，发现加水量对防止光生空穴与光生电子复合有重要作用。

Effect of Trace Water on the Property of ZnO Colloid

Taking methanol as solvent, the authors prepare ZnO colloid by sol gel method under the condition of excessive Zn 2 ; and inquire into the effect of trace water addition on the particle diameter and property of ZnO colloid. As shown by the results, the more water addition during the process of preparation the larger the particle diameter of ZnO colloid. Consequently, water addition is able to control the size of colloidal particle; and water additon will influence properties of ZnO colloid such as pH value, absorption spectrum and fluorescence spectrum. A discussion is devoted to mechanism of fluorescence emergence and to effect of water addition on intensity of fluorescence. Water addition is found to be important for avoiding photoproduced hole and photoproduced electron recombination.