Spontaneous Formation of Ordered Nanobubbles in Anodic Tungsten Oxide during Anodization

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• 作者：Wei-Hsun Chen ; Ming-Yu Lai ; Kun-Tong Tsai ; Chih-Yi Liu ; Yuh-Lin Wang
• 刊名：Journal of Physical Chemistry C
• 出版年：2011
• 出版时间：September 29, 2011
• 年：2011
• 卷：115
• 期：38
• 页码：18406-18411
• 全文大小：1019K
• 年卷期：v.115,no.38(September 29, 2011)
• ISSN：1932-7455

文摘

Anodization of tungsten in NaOH leads to the growth of a porous tungsten oxide layer with either irregular trenches or isolated nanobubbles. For anodic potentials between 30 to 40 V and NaOH concentrations of 2鈥? M, nanobubbles with diameters of 40 nm form spontaneously and self-organize into hexagonal close-packed ordered arrays with a period of 60 nm. The nanobubbles are likely to be initiated by the electrostatic stress on the oxide film that could become more plastic under the influence of high-density anodic current. The ordered arrangement of the nanobubbles manifests a delicate balance of the stress on their surrounding oxide walls.