Fabrication of TiO2 binary inverse opals without overlayers via the sandwich-vacuum infiltration of precursor.
Fabrication of TiO2 binary inverse opals without overlayers via the sandwich-vacuum infiltration of precursor.
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DOI：
10.1021/la200111j
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发表时间：
2011-03
期刊：
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通讯作者：
Zhongyu Cai;J. Teng;Z. Xiong;Yanqiang Li;Qin Li;Xianmao Lu;X. S. Zhao
中科院分区：
文献类型：
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作者：
Zhongyu Cai;J. Teng;Z. Xiong;Yanqiang Li;Qin Li;Xianmao Lu;X. S. Zhao
采用真空-真空法制备了具有开放表面的二氧化钛（TiO（2））二元反蛋白石。在该方法中，一种湿稳定的TiO（2）前体回填到聚苯乙烯二元胶体晶体（PS bCCs）的间隙空间，作为模板。通过煅烧除去模板剂得到具有三维有序大孔（3DOM）结构的TiO（2）二元反蛋白石。光学反射光谱表明，在3DOM TiO（2）样品中存在一个赝阻带隙。随着模板中PS小球与大小球的数量比的增加，赝阻带隙的位置向低波长区域移动。实验结果表明，真空蒸发法是一种简单、快速的制备大畴无覆盖层的TiO（2）二元反蛋白石的方法。以3DOM TiO（2）为光催化剂，对苯甲酸进行光催化降解。结果表明，与相同烧结条件下制备的TiO（2）纳米粒子相比，3DOM TiO（2）材料具有更高的光催化活性。
A sandwich-vacuum method was demonstrated for the fabrication of titania (TiO(2)) binary inverse opals with an open surface. In this method, a moisture-stable TiO(2) precursor was backfilled into the interstitial spaces of polystyrene binary colloidal crystals (PS bCCs), which served as a template. Removal of the template by calcination yielded TiO(2) binary inverse opals with a 3D-ordered macroporous (3DOM) structure. Optical reflectance spectra revealed the existence of a pseudostop band gap in the 3DOM TiO(2) samples. The position of the pseudostop band gap shifted to the low-wavelength region as the number ratio of small over large PS spheres was increased in the template. The sandwich-vacuum method proved to be simple and rapid for the fabrication of TiO(2) binary inverse opals without overlayers in large domains. The 3DOM TiO(2) materials were used as a photocatalyst for the degradation of benzoic acid. Results showed that in comparison to TiO(2) nanoparticles prepared under the same sintering conditions, the 3DOM TiO(2) materials displayed enhanced photocatalytic activity.