SiO2/TiO2 double-shell hollow particles: Fabrication and UV-Vis spectrum characterization
SiO2/TiO2 double-shell hollow particles: Fabrication and UV-Vis spectrum characterization
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DOI：
10.1016/j.apt.2015.10.016
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发表时间：
2016-05-01
影响因子：
5.2
通讯作者：
Shirai, Takashi
中科院分区：
文献类型：
--
作者：
Chen, Wanghui;Takai, Chika;Shirai, Takashi
采用溶胶-凝胶法成功制备了结构明确的 SiO2/TiO2 双壳空心颗粒 (STDSHPs)，避免了颗粒聚集和独立 TiO2 颗粒的生成。与传统的固体TiO2颗粒相比，STDSHPs表现出新颖的中空结构、更小的TiO2晶粒尺寸（9 nm）和更大的比表面积（113 m(2)/g）。在紫外-可见光谱表征中，STDSHP 在紫外光和可见光范围内均表现出显着的光捕获能力。 STDSHP 还表现出比固体 TiO2 颗粒和商用 TiO2 光催化剂 P25 更强的单位重量紫外线吸收能力，这可能归因于其新颖的中空结构，因此不存在光无法到达的 TiO2 颗粒。此外，我们通过 Brus 有效质量模型（EMM）分析了 STDSHP 的窄带隙。 (C) 2015 年日本粉末技术学会。由 Elsevier B.V. 和日本粉末技术协会出版。版权所有。
Well-defined SiO2/TiO2 double-shell hollow particles (STDSHPs) were successfully fabricated by a sol-gel method with avoiding the particle aggregations and the generation of freestanding TiO2 particles. Comparing with the conventional solid TiO2 particles, STDSHPs showed a novel hollow structure, a much smaller TiO2 grain size (9 nm), and a larger specific surface area (113 m(2)/g). In the UV-vis spectrum characterizations, STDSHPs showed significant light harvesting capability in both UV- and visible-light range. STDSHPs also showed stronger per-weight UV absorbance capability than solid TiO2 particles and commercial TiO2 photocatalyst P25, which could be attributed to their novel hollow structure-and thus the absence of light-inaccessible TiO2 particles. Moreover, we analyzed the narrowed band-gap of STDSHPs by the Brus' effective-mass model (EMM). (C) 2015 The Society of Powder Technology Japan. Published by Elsevier B.V. and The Society of Powder Technology Japan. All rights reserved.