Yao Lujun, Zheng Maojun, Li Changli, Ma Li, Shen Wenzhong
Laboratory of Condensed Matter Spectroscopy and Opto-Electronic Physics, and Key laboratory of Artificial Structures and Quantum Control (Ministry of Education), Department of Physics, Shanghai Jiao Tong University, Shanghai 200240, People's Republic of China.
Nanoscale Res Lett. 2012 Apr 13;7(1):216. doi: 10.1186/1556-276X-7-216.
This work reports an oriented growth process of two-dimensional (2D) ZnO nanoflakes on aluminum substrate through a low temperature hydrothermal technique and proposes the preliminary growth mechanism. A bionic superhydrophobic surface with excellent corrosion protection over a wide pH range in both acidic and alkaline solutions was constructed by a chemical coating treatment with stearic acid (SA) molecules on ZnO nanoflakes. It is found that the superhydrophobic surface of ZnO nanoflake arrays shows a maximum water contact angle (CA) of 157° and a low sliding angle of 8°, and it can be reversibly switched to its initial superhydrophilic state under ultraviolet (UV) irradiation, which is due to the UV-induced decomposition of the coated SA molecules. This study is significant for simple and inexpensive building of large-scale 2D ZnO nanoflake arrays with special wettability which can extend the applications of ZnO films to many other important fields.
这项工作报道了通过低温水热技术在铝衬底上二维（2D）ZnO纳米片的取向生长过程，并提出了初步的生长机制。通过用硬脂酸（SA）分子对ZnO纳米片进行化学涂层处理，构建了一种在酸性和碱性溶液的宽pH范围内具有优异腐蚀防护性能的仿生超疏水表面。研究发现，ZnO纳米片阵列的超疏水表面显示出最大水接触角（CA）为157°，滑动角低至8°，并且在紫外（UV）照射下可以可逆地转变为其初始超亲水状态，这是由于涂层SA分子的紫外诱导分解所致。该研究对于简单且廉价地构建具有特殊润湿性的大规模2D ZnO纳米片阵列具有重要意义，这可以将ZnO薄膜的应用扩展到许多其他重要领域。
