量子尺寸氧化锌微粒的制备与表征

用胶体化学方法制备了两种粒径分别为３ｎｍ（Ｐ１）和５ｎｍ（Ｐ２）的纤锌矿型氧化锌纳米微粒。利用多种表征手段对颗粒结构与光电性质进行表征。两种微粒吸收谱带呈现不同程度的蓝移。表面光电压谱与热重分析研究表明，因制备条件不同，两种颗粒表面性质存在很大差异。并结合制备条件对颗粒表面性质进行了分析。

Preparation and Characterization of Quantum-sized ZnO Nanoparticles

In the present work,we prepared two kinds of quantum sized wurtzite ZnO particles whose average sizes were about 3 nm and 5 nm,respectively.The particles prepared were characterized by UV Vis absorption spectra,IR spectra,XRD,TGA,DTA,transmission electron microscopy (TEM),surface photovoltage spectra (SPS) and electrical field induced surface photovoltage spectra (EFISPS) etc..IR study showed that acetic acid molecules coordinated to the surface of ZnO in two modes,one is of the bridging type,and the other of the unidentate type.The latter is weaker.It was indicated by EFISPS that the two kinds of particles have very different surface properties because of their different sizes and preparation processes.We found that basic zinc acetate structure exists on the surface of 3 nm particles.While for 5 nm particles prepared by aging the 3 nm particles,that surface structure disappeared,but the particles were doped with lithium ions in the aging process.The above phenomena were explained by considering the hydrolytic chemistry of zinc acetate.