采用溶胶一凝胶法制备Cu0.05Zn0.95O和Cu0.10Zn0.90O薄膜,在500,600,700和800℃条件下对薄膜进行退火处理,用X射线衍射仪、原子力显微镜、紫外可见分光光度计、荧光光谱仪和接触角测试仪测试薄膜的微结构、表面形貌、透射光谱、光致发光谱和接触角。结果显示,对于相同Cu含量ZnO薄膜,随着退火温度升高,CuO衍射峰的强度明显增强,粗糙度均方根值先减小后增大,紫外吸收边发生红移,紫光发射强度逐渐增大。光照前,薄膜接触角均大于90°,表现为疏水特性;经120min紫外照射的薄膜由疏水性转变为亲水性。研究退火温度对薄膜光诱导亲水性的影响,揭示薄膜表面浸润性及其光诱导转变的形成机理。
The Cu-doped ZnO coatings, Cu0.05Zn0.95O and Cu0. 10Zn0.90O, were synthesized in sol-gel method. The im-pacts of the synthesis conditions, including the sintering temperature and Cu-content, on the micmstructures, phase struc-tures, and properties of the coatings were evaluated. The Cu-doped ZnO coatings were characterized with X-ray diffraction, atomic force microscopy, ultra violet visible(UV-Vis) spectroscopy, and photo luminescence(PL) spectroscopy. The results show that the sintering temperature strongly affects properties of the Cu-doped ZnO coatings. For example, with a fixed Cu- content,as the temperature increased from 500 to 800℃, its XRD peak height of CuO increased, its surfaces roughness changed in a decrease-increase mode, accompanied with a red-shift of its UV absorption edge and an increasingly stronger emission intensity of violet light. Interesting finding is that UV irradiation for 120min turned its hydrophobieity into hy-drophilicity.