Ordered Nanogroove Arrays on n-TiO2 with a Variation of the Groove Depth, Formed by Self-Organized Photoetching
Ordered Nanogroove Arrays on n-TiO2 with a Variation of the Groove Depth, Formed by Self-Organized Photoetching
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DOI：
10.1021/jp067549q
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发表时间：
2007-02
影响因子：
3.7
通讯作者：
Shuji Nakanishi;Takatoshi Tanaka;Yuichiro Saji;E. Tsuji;Satoshi Fukushima;Kazuhiro Fukami;T. Nagai;Ryuhei Nakamura;A. Imanishi;Y. Nakato
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文献类型：
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作者：
Shuji Nakanishi;Takatoshi Tanaka;Yuichiro Saji;E. Tsuji;Satoshi Fukushima;Kazuhiro Fukami;T. Nagai;Ryuhei Nakamura;A. Imanishi;Y. Nakato
采用光电化学方法刻蚀纳米二氧化钛(金红石)单晶，在不使用印迹或模板的情况下，在表面0.5×0.5 cm的宏观范围内形成了间距约为300 nm的有序纳米沟槽阵列。此外，从纳米科学和纳米技术的角度来看，通过图案化的光强度照射光刻可以在所需的位置获得具有所需深度的纳米沟槽。提出了一种自组织光刻形成纳米沟槽有序阵列的合理模型，在该模型中，由于高电位梯度导致光生空穴浓度过高，导致沟槽底部的自催化加速光刻，以及由于加速的光反应导致溶液pH的增加，导致沟槽底部n-TiO2平带电位的下移，从而使其延迟。
Photoelectrochemical etching of n-TiO2 (rutile) single crystals produced ordered arrays of nanogrooves with the spacing of about 300 nm over a macroscopically wide area of 0.5 × 0.5 cm at the surface without any use of imprints or templates. Moreover, the photoetching by irradiation with patterned light intensities gave nanogrooves with a desired depth at a desired location, interesting from the point of view of nanoscience and nanotechnology. A plausible model is proposed for the formation of ordered arrays of nanogrooves in terms of self-organized photoetching in which autocatalytic accelerated photoetching at the bottom of the grooves, caused by an excess concentration of photogenerated holes due to a high potential gradient, is coupled with its retardation by a downward shift in the flat-band potential of n-TiO2 at the bottom of the grooves, induced by an increase in the solution pH due to accelerated photoreactions.