Dependence of Photocatalytic Activity on Aspect Ratio of Shape-Controlled Rutile Titanium(IV) Oxide Nanorods

作者：Murakami Naoya; Katayama Satoshi; Nakamura Misa; Tsubota Toshiki; Ohno Teruhisa^*

来源：Journal of Physical Chemistry C, 2011, 115(2): 419-424.

DOI：10.1021/jp109057s

Shape-controlled rutile titanium(IV) oxide (TiO(2)) nanorods with various aspect ratios were prepared by two-step synthesis in the presence of two kinds of inorganic anions. The first synthesis step from titanium(III) chloride solution induced the formation of aggregated needlelike rutile TiO(2), the shape of which largely depended on the inorganic anion used. Moreover, shape-controlled rutile TiO(2) rods with {110} side crystal faces and {111} and/or {001} edge crystal faces were obtained by hydrothermal treatment of the needlelike rutile TiO(2). Their aspect ratios were largely influenced by the starting material used in the hydrothermal treatment. The photocatalytic activity for decomposition of acetaldehyde increased with decreasing aspect ratio because the surface area ratio of {111} and/or {001} to {110} exposed crystal faces, which are attributed to oxidation and reduction sites respectively, became more optimal.

• 出版日期2011-1-20