Transformation of layered titanate nanosheets into nanostructured porous titanium dioxide in polycation solution
Transformation of layered titanate nanosheets into nanostructured porous titanium dioxide in polycation solution
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DOI：
10.1016/j.micromeso.2008.03.029
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发表时间：
2008-12-01
影响因子：
5.2
通讯作者：
Feng, Qi
中科院分区：
文献类型：
--
作者：
Wen, Puhong;Itoh, Hiroshi;Feng, Qi
由纳米棒状晶体构成的纳米结构多孔 TiO2 颗粒是由层状钛酸盐纳米片前体制备而成。合成过程包括两个步骤：通过将纳米片与聚（二烯丙基二甲基铵）（PDDA）聚阳离子组装来构建多孔纳米结构，以及通过水热反应将纳米结构的钛酸盐纳米片拓扑转化为锐钛矿型TiO2纳米晶体。通过 XRD、DTA-TG、SEM、TEM 分析以及比表面积、孔径分布、钌染料 (N719) 吸附和光催化活性的测量来表征反应过程和纳米结构多孔颗粒。多孔颗粒的形态取决于反应体系中PDDA的浓度。由纳米棒状锐钛矿晶体构建的球形颗粒可以在高PDDA浓度条件下制备。从钛酸盐纳米片到锐钛矿的拓扑转化反应导致锐钛矿纳米晶体的形成，其优先在表面上暴露锐钛矿的（0 10）平面。纳米结构多孔锐钛矿颗粒的表面表现出高N719染料吸附能力和高光催化活性，在染料敏化太阳能电池中具有潜在的应用前景。 (C) 2008 Elsevier Inc. 保留所有权利。
Nanostructured porous TiO2 particles constructed from nanorod-like crystals were prepared from a layered titanate nanosheet precursor. The synthesis process includes two steps: construction of a porous nanostructure by assembling the nanosheets with poly (diallyldimethylammonium) (PDDA) polycations, and topotactic transformation of the nanostructured titanate nanosheets into anatase-type TiO2 nanocrystals by hydrothermal reaction. The reaction process and nanostructured porous particles were characterized by XRD, DTA-TG, SEM, TEM analyses, and measurements of specific surface area, pore size distribution, ruthenium dye (N719) adsorption, and photocatalytic activity. The morphology of the porous particles is dependent on the PDDA concentration in the reaction system. Spherical particles constructed from nanorod-like anatase crystals can be prepared under the high PDDA concentration conditions. The topotactic transformation reaction from the titanate nanosheet to anatase resulted in the formation of anatase nanocrystals which preferentially expose the (0 10) plane of anatase on the surface. The surface of the nanostructured porous anatase particles shows high N719 dye adsorption ability and high photocatalytic activity, which have potential application in dye-sensitized solar cells. (C) 2008 Elsevier Inc. All rights reserved.