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首页> 外文期刊>Nanotechnology >The efficiency of nanotube formation on titanium anodized under voltage and current control in fluoride/glycerol electrolyte
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The efficiency of nanotube formation on titanium anodized under voltage and current control in fluoride/glycerol electrolyte

机译：电压和电流控制下氟化物/甘油电解质中阳极氧化钛上纳米管形成效率

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摘要

The formation of nanotubes on titanium is compared for anodizing under controlled voltage and controlled current in a fluoride/glycerol electrolyte. Rutherford backscattering spectroscopy and nuclear reaction analysis are employed to determine the film compositions. Film morphologies are examined by electron microscopy. The findings reveal films of approximate composition TiO2.0.15TiF(4) that probably also contain derivatives of glycerol. Controlled voltage conditions resulted in more uniform final nanotube dimensions, for a particular charge density, and the highest efficiency of film growth, with the charge of the titanium in the film representing similar to 48% of the charge passed during anodizing. Under current control, the efficiency decreased from similar to 40% to similar to 23% with increase of the current density from 0.1 to 0.5 mA cm(-2). Further, the thickness of the barrier layer was sometimes enhanced under current control, possibly due to a non-uniform current distribution and consequently elevated local temperature.
机译：比较在钛上纳米管的形成，以在氟化物/甘油电解质中在受控电压和受控电流下进行阳极氧化。使用卢瑟福背散射光谱和核反应分析来确定膜的组成。膜形态通过电子显微镜检查。这些发现揭示了成分约为TiO2.0.15TiF（4）的薄膜，该薄膜也可能含有甘油衍生物。对于特定的电荷密度和受控的电压条件，最终纳米管的尺寸更加均匀，并且膜生长效率最高，膜中钛的电荷约占阳极氧化过程中所通过电荷的48％。在电流控制下，随着电流密度从0.1 mA cm（-2）增加，效率从相似的40％降低到相似的23％。此外，势垒层的厚度有时在电流控制下增加，这可能是由于电流分布不均匀以及因此局部温度升高所致。

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