(青岛理工大学 机械工程学院，青岛 266033)
摘 要: 利用低温液相技术及氢氟酸的调控作用制备“短棒”、“球形”和“花形等不同形貌的ZnO微纳米结构，研究这些形貌特征的ZnO表面在真空紫外光(VUV)处理后的润湿性变化情况。结果表明，经VUV光照处理后，3种不同形貌的ZnO表面润湿性均发生从高疏水(接触角CA＞120˚)到超亲水的转变(CA~0˚)，其变化速度均经历了一个先快后慢的过程。用十八烷基三甲氧基硅烷对ZnO表面进行改性，使ZnO表面覆盖一层自组装单分子膜，则其疏水性有所增强(CA＞140˚)；此时再经VUV光照后，ZnO表面从高疏水到超亲水的转变进程显著变缓。对各种不同微纳米结构ZnO表面进行光润湿性研究，将有助于实现ZnO基质润湿性梯度表面。
关键字: ZnO；薄膜；润湿性；微纳米结构；自组装单分子膜；光响应
（School of Mechanical Engineering, Qingdao Technological University, Qingdao 266033, China）
Abstract:Several ZnO micro-nano structures with different morphologies, such as rods, spheres and flowers, were prepared by means of low temperature liquid method tailored by hydrofluoric acid. Their vacuum-ultraviolet (VUV) photoresponsive wettabilities were focused. With VUV illumination time aging, the wettabilities of all ZnO micro-nanostructures change from high-hydrophobic (contact angle (CA)＞120˚) to superhydrophilic (CA−0˚), and all of the water contact angles change with an uneven velocity: fast firstly, and then slowly. If the surfaces of ZnO micro-nanostructures are modified by n-octadecyltrimethoxysilane (ODS), i. e. the surfaces are coated by a self-assembly monolayer, their water contact angles increase (CA＞140˚). Also, it takes more time to transmit from high-hydrophobic to superhydrophilic for ZnO surfaces under VUV illumination after they are modified by ODS. All of the results can be helpful to realize ZnO-based wettability-gradient surfaces.
Key words: ZnO; thin film; wettability; micro-nanostructure; self-assembly monolayer; photoresponsive
