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通过水热合成、硬脂酸修饰的方法制备了超疏水性ZnO纳米棒阵列膜.该膜经低功率紫外辐照后,表面润湿性转变为超亲水性;在暗室中放置一段时间,则又恢复为超疏水性.ZnO纳米棒阵列膜样品经UV辐照后通过FT-IR分析发现其疏水性硬脂酸并未发生明显地光降解,这表明紫外诱导的表面润湿性转变并非由光催化去除有机物导致.继而通过对样品的XPS研究发现,氧空位(VO)在膜表面润湿性的转变中发挥了重要作用.提供了一种研究紫外诱导ZnO纳米棒阵列膜表面润湿性可逆转换机制的新途径.

Superhydrophobic ZnO nanorod array films have been prepared via a hydrothermal route and stearic acid modification.Upon low-power UV irradiation, the surface wettability has gradually changed from superhydrophobicity to superhydrophilicity.This transition can be reversed upon prolonged dark storage.FT-IR analyses show that the hydrophobic stearic acid on the nanorods has not obviously degraded by photoirradiation.This indicates that UV-induced superhydrophilicity do not relate to the hydrocarbon removed by photocatalysis.Furthermore, oxygen vacancies play crucial roles in causing the reversible conversion of the surface wettability, which has been confirmed by XPS analysis.This work provides a new idea for studying the mechanism of UV-induced wettability conversion.