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Oriented TiO_2 Nanostructured Pillar Arrays: Synthesis and Characterization

机译：取向的TiO_2纳米结构柱阵列：合成与表征

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摘要

TiO_2 with tailored porosity, particle size, and shape in the nanometer range is attracting a lot of attention because of its potential use in photocatalysis and energy conversion. As far as photocatalysis applications are concerned, the use of high surface area TiO_2 as a photocatalyst for pollutant degradation and for water splitting is of particular interest. The presence of bulk defects and grain boundary barriers - associated with the small dimensions of the particles, recombination of electrons, and holes generated by band-gap excitation - is limiting the photoconversion efficiency. To improve charge separation and the associated catalytic efficiency, researchers have essentially followed two strategies. The first centers on tailoring of the size, shape, and three-dimensional organization of TiO_2 particles or of Ti-O-Ti wires with semiconductor character. The second strategy focuses on improving the photocatalytic properties: ⅰ) by incorporating metal cations and anions (mainly nitrogen, sulphur, iodine, and other elements) into the bulk; ⅱ) by supporting metal particles (mainly Au, Ag, Pt, Ni). Interesting results are obtained when the two above-mentioned research directions are combined to benefit from the sum of their advantages.
机译：TiO_2具有定制的孔隙率，粒径和纳米范围内的形状，由于其在光催化和能量转换中的潜在用途而备受关注。就光催化应用而言，特别关注使用高表面积的TiO_2作为光催化剂进行污染物降解和水分解。体缺陷和晶界壁垒的存在-与颗粒的小尺寸，电子的复合以及由带隙激发产生的空穴相关-限制了光转换效率。为了改善电荷分离和相关的催化效率，研究人员基本上遵循了两种策略。第一个重点是定制具有半导体特性的TiO_2颗粒或Ti-O-Ti线的尺寸，形状和三维组织。第二种策略着重于改善光催化性能：ⅰ）通过将金属阳离子和阴离子（主要是氮，硫，碘和其他元素）掺入主体中； ⅱ）通过支撑金属颗粒（主要是金，银，铂，镍）。当将上述两个研究方向结合起来以受益于它们的优点时，将获得有趣的结果。

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