Surface study of sintered alumina substrates using solution-processed ZnO nanorods as a microscopic wettability indicator

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• 作者：Tsutomu Shinagawa ; Mitsuru Watanabe ; Masaya Chigane and Hisaya Takahashi
• 刊名：Surface and Interface Analysis
• 出版年：2017
• 出版时间：March 2017
• 年：2017
• 卷：49
• 期：3
• 页码：216-222
• 全文大小：658K
• ISSN：1096-9918

文摘

Wettability and its distribution are crucial factors that indicate the surface conditions of substrates. We report a surface study of sintered alumina substrates using solution-processed ZnO nanorods as a microscopic wettability indicator. The alumina substrates comprising of micrometer-sized sintered grains were treated separately with ultraviolet/ozone (dry process) or ozone water (wet process), and their surface conditions were characterized by conventional surface analysis methods, such as water contact angle, X-ray photoelectron spectroscopy and grazing angle attenuated total reflection Fourier transform infrared spectroscopy. The results showed that the alumina substrates treated with ultraviolet/ozone and ozone water had distinct clean surfaces compared to those without treatments, but no significant differences were noted between these two ozone-based treatments. Then, as a wettability-sensitive deposition technique, Pd-catalyzed chemical deposition of ZnO nanorods was performed on the alumina substrates, which involved dip coating of Pd nanoparticles on the substrates in aqueous solutions, followed by the chemical solution growth of ZnO. Vertically aligned ZnO nanorods of ~85 nm in diameter were densely formed along a rough surface of the substrates. Morphological uniformity of the nanorods varied depending on the treatment condition; local surfaces with sufficient wettability provided uniform nanorods but those with insufficient wettability gave irregular nanorods, making the visualization of the microscopic surface wettability possible. Copyright