Size- and shape-dependent transformation of nanosized titanate into analogous anatase titania nanostructures
Size- and shape-dependent transformation of nanosized titanate into analogous anatase titania nanostructures
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DOI：
10.1021/ja0607483
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发表时间：
2006-06-28
影响因子：
15
通讯作者：
Wong, Stanislaus S.
中科院分区：
文献类型：
--
作者：
Mao, Yuanbing;Wong, Stanislaus S.
在中性溶液中，钛酸盐纳米结构在水热软化学转化过程中，证明了尺寸和形状依赖性的形态转变为其锐钛矿二氧化钛对应物。具体来说，将直径接近10 nm的纤铁矿钛酸氢纳米管转化为平均尺寸为12 nm的锐钛矿纳米颗粒。直径相对较小（平均直径范围为 200 nm）的纤铁矿钛酸氢纳米线被转化为类似的锐钛矿亚微米线图案，类似于具有完全平行、定向边缘的相邻锐钛矿纳米晶体簇。我们的结果表明，合成的 TiO2 纳米结构比衍生它们的商业二氧化钛前体具有更高的光催化活性。
A size- and shape-dependent morphological transformation was demonstrated during the hydrothermal soft chemical transformation, in neutral solution, of titanate nanostructures into their anatase titania counterparts. Specifically, lepidocrocite hydrogen titanate nanotubes with diameters of similar to 10 nm were transformed into anatase nanoparticles with an average size of 12 nm. Lepidocrocite hydrogen titanate nanowires with relatively small diameters (average diameter range of 200 nm) titanate wires were transformed into analogous anatase submicron wire motifs, resembling clusters of adjoining anatase nanocrystals with perfectly parallel, oriented fringes. Our results indicate that as-synthesized TiO2 nanostructures possessed higher photocatalytic activity than the commercial titania precursors from whence they were derived.