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Low-temperature synthesis and electrophoretic deposition of shape-controlled titanium dioxide nanocrystals

机译：形状控制的二氧化钛纳米晶体的低温合成和电泳沉积

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摘要

A comprehensive, low-temperature strategy for obtaining optimized, dense and nanostructured TiO2 thin films is proposed. The nanocrystals of anatase-TiO2 were prepared from highly reactive crystals of [Ti8O12(H2O)(24)]Cl-8, HCl, 7H(2)O, a preferred titanium precursor for replacing alkoxides. Oleic acid and oleylamine were employed as capping ligands in order to control the shape and the size of TiO2 nanocrystals during solvothermal treatment. Following an acid treatment, the ligands were removed from the surface of the nanocrystals, thereby enabling their re-dispersion in an ethanol-based charging solution. The stable transparent colloidal solutions were suitable for electrophoretic deposition of the nanocrystals (<15 nm in size) on conductive substrates. Transparent layers of TiO2 nanocrystals, without post-annealing, were successfully prepared under low bias voltage (10 V) with thicknesses of up to 2 mm within a mere 10 min.
机译：提出了一种用于获得优化的致密纳米结构TiO2薄膜的综合低温策略。锐钛矿型TiO2纳米晶体是由高反应性晶体[Ti8O12（H2O）（24）] Cl-8，HCl，7H（2）O（一种用于取代醇盐的钛前体）制成的。为了控制溶剂热处理过程中TiO2纳米晶体的形状和尺寸，使用油酸和油胺作为封端配体。酸处理后，将配体从纳米晶体的表面去除，从而使其能够重新分散在乙醇基加料溶液中。稳定的透明胶体溶液适用于在导电基板上电泳沉积纳米晶体（尺寸小于15 nm）。无需后退火，即可在低偏置电压（10 V）的情况下，仅在10分钟内完成厚度高达2 mm的透明TiO2纳米晶体的透明层。

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