ZnO/Ag复合膜的制备及其润湿性转换研究

利用溶胶-凝胶技术制备了ZnO/Ag复合膜. 采用X射线粉末衍射和扫描电子显微镜对其物相组成、 晶型结构以及表面形貌进行了表征, 采用接触角测试仪对其润湿性进行了表征, 并研究了紫外光照射下Ag的掺杂量对ZnO薄膜润湿性的影响. 结果表明, 当Ag掺杂量(摩尔分数)为5%时, 所得膜的润湿性转换速率最快, 紫外光照3 h后, 其润湿性由超疏水性转换为亲水性, 黑暗中放置5 d后, 亲水性再次转换为超疏水, 实现了润湿性的可逆转换.

Fabrication and Wettability Conversion of ZnO/Ag Composite Films

ZnO/Ag composite films were fabricated through sol-gel method. The phases, crystallographic structures and surface topographies of the ZnO/Ag films were characterized by an X-ray diffractometer(XRD) and a scanning electron microscope(SEM). The wettabilities of ZnO/Ag films were characterized by a drop shape analyzer. The effect of Ag content on wettability of ZnO film under UV light was investigated. The result indicated that the molar fraction of Ag loaded on ZnO film had a significant effect on the wettability conversion. A rapid wettability conversion was occurred on ZnO/Ag composite film with Ag content of 5%(molar fraction), which converted hydrophilic after 3 h UV irradiation and returned to superhydrophobic state after stored in a dark place for 5 d. The mechanism for this wettability reversible conversion was discussed.