【摘要】 利用简单的低温液相技术,通过氢氟酸(HF)调控反应溶液的pH值制备了具有微/纳米阶层结构的ZnO薄膜。对其接触角进行测量,结果表明该微纳米阶层结构不仅具有超疏水性,而且在真空紫外光照和暗室保存的循环作用下具有超疏水/超亲水可逆转变的特征。对HF不同加入量的ZnO形貌观察表明,反应溶液中的H+和F-对ZnO的形貌均具有重要作用:H+主要抑制ZnO沿c轴方向生长,F-能够促使ZnO从"棒"状变为"花球"形,从而使ZnO具有微/纳米结构相结合的阶层结构。当HF的浓度比较低时,H+起主要作用;浓度比较高时,F-起主要作用。这种新颖的微纳米结构及其特异的润湿学特性,将有助于该薄膜在微流体器件上的应用。更多还原

【Abstract】 Super-hydrophobic ZnO films were prepared by a simple and low temperature solution method,for which the pH value of the solution was controlled by hydrofluoric acid(HF).The surface of the films exhibit hierarchical structure with nanostructures,which can be responsible for their superhydrophobicity(water contact angle is about 151 degree).The wettability of the film can be reversibly converted from superhydrophobicity to superhydrophilicity circularly by alternation of vacuum ultraviolet irradiation and dark storage.Both the H~+ and F~-in the reaction solution play an important role to the morphology of ZnO: when HF concentration is low,H~+ plays the leading role,which results in the decrease of the aspect ratio of ZnO rods;when HF concentration is high,F~-plays the leading role,which leads to the conversion of rods to micro-spheres with nanostructures(i.e.hierarchical structure).Such novel micro-nanostructures and their special wettability are expected to be applied in micro-fluid devices.更多还原