Zhang Chao, Zhou Yuming, Zhang Yiwei, Zhao Shuo, Fang Jiasheng, Sheng Xiaoli, Zhang Tao, Zhang Hongxing
School of Chemistry and Chemical Engineering, Southeast University, Jiangsu Optoelectronic Functional Materials and Engineering Laboratory, Nanjing, 211189, P. R. China.
Chemistry. 2017 Mar 28;23(18):4336-4343. doi: 10.1002/chem.201602654. Epub 2017 Mar 6.
High-quality double-shelled TiO hollow spheres (DHS-Ti) assembled with TiO nanosheets have been synthesized for the first time through a simple hydrothermal treatment of sSiO @TiO (TiO -coated solid SiO spheres). The double-shelled structure shows a high BET surface area up to 417.6 m g . Anatase DHS-Ti of high crystallinity can be obtained without structural collapse by calcination treatment. The effects of cetyl trimethylammonium bromide (CTAB) concentration, pH, and hydrothermal reaction temperature have also been investigated with a series of contrast experiments. A formation mechanism involving the in situ growth of amorphous TiO nanosheets followed by the redeposition of dissolved silica species is proposed. Lastly, the DHS-Ti forming strategy can be extended as a general strategy to fabricate various morphological hollow nanostructures and double-shelled Pt nanocatalysts by rationally selecting functional sSiO nanoparticles as core materials. This work could open up a new strategy for controllable synthesis of complex hollow structures and other functional materials.
首次通过对sSiO@TiO（TiO包覆的固体SiO球体）进行简单水热处理，合成了由TiO纳米片组装而成的高质量双壳TiO空心球（DHS-Ti）。这种双壳结构具有高达417.6 m²/g的高比表面积。通过煅烧处理可获得高结晶度的锐钛矿型DHS-Ti，且不会发生结构坍塌。还通过一系列对比实验研究了十六烷基三甲基溴化铵（CTAB）浓度、pH值和水热反应温度的影响。提出了一种形成机制，即非晶态TiO纳米片原位生长，随后溶解的硅物种再沉积。最后，通过合理选择功能性sSiO纳米颗粒作为核心材料，DHS-Ti的形成策略可扩展为制备各种形态空心纳米结构和双壳Pt纳米催化剂的通用策略。这项工作可为复杂空心结构和其他功能材料的可控合成开辟新策略。
