(青島理工大學 機械工程學院，青島 266033)
摘 要: 利用低溫液相技術及氫氟酸的調控作用制備“短棒”、“球形”和“花形等不同形貌的ZnO微納米結構，研究這些形貌特征的ZnO表面在真空紫外光(VUV)處理后的潤濕性變化情況。結果表明，經(jīng)VUV光照處理后，3種不同形貌的ZnO表面潤濕性均發(fā)生從高疏水(接觸角CA＞120˚)到超親水的轉變(CA~0˚)，其變化速度均經(jīng)歷了一個先快后慢的過程。用十八烷基三甲氧基硅烷對ZnO表面進行改性，使ZnO表面覆蓋一層自組裝單分子膜，則其疏水性有所增強(CA＞140˚)；此時再經(jīng)VUV光照后，ZnO表面從高疏水到超親水的轉變進程顯著變緩。對各種不同微納米結構ZnO表面進行光潤濕性研究，將有助于實現(xiàn)ZnO基質潤濕性梯度表面。
關鍵字: ZnO；薄膜；潤濕性；微納米結構；自組裝單分子膜；光響應
（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
