采用溶胶-凝胶法制备了ZnO薄膜,利用溶剂热沉积法获得大面积均匀ZnO纳米线阵列。通过对水在ZnO材料表面的浸润性研究,发现薄膜材料表面的粗糙度对ZnO膜亲水性有增强作用,而周期性ZnO阵列微结构表面可以实现其疏水性质增强效果。同时从理论上分析了这两种现象的物理机制,讨论了空气填隙对ZnO纳米线阵列表面的浸润性质的敏感性。制备出ZnO纳米线阵列的表观接触角约为103°,具有较强的疏水性质,可为进一步的ZnO光流控研究提供实验基础。
The ZnO film and vertical nanowire array on the glass and silicon substrates were synthesized successfully using sol-gel method. The wetability of the ZnO films and ZnO nano arrays were investigated, which showed the enhancement of the hydrophilic nature of the ZnO films by slight roughness of nanoparticles dispers ed, whereas hydrophobic surfaces are obtained induced by the vertical nanowire arrays. A theoretical discussion about the possibility of the air bubble trapping between two vertical nanowires was devoted to the hydrophobicity of the ZnO nanowire array. Additionally, a delicate electrostatic force microscopy was utilized to analyze the charge effect on the wetting characteristics of the ZnO nanowire array, presenting the consistent result of negative surface charge on the top of the nanowires. Our founding will be helpful to understand the electro-wetting and opto-wetting properties of ZnO nanostructured materials.
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