Mesoporous titania films investigated by positron annihilation based on a slow positron beam |
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| Authors: | Bangyun Xiong Xiuqin Tang Chunqing He Hui Cao Jingpei Huo Jie Luo Haiying He |
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| Institution: | 1. School of Materials Science and Energy Engineering, Foshan University, Foshan 528000, China;2. R & D Center for Non-power Nuclear Technology, School of Nuclear Technology and Chemistry & Biology, Hubei University of Science and Technology, Xianning 437100, China;3. Key Laboratory of Nuclear Solid State Physics Hubei Province, School of Physics and Technology, Wuhan University, Wuhan 430072, China |
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| Abstract: | Tunable mesoporous titania (TiO2) thin films were synthesized via a sol-gel method using an amphiphilic triblock copolymer F38 as the structural template. The dependence of crystalization, pore morphology and interconnectivity of TiO2 films on the weight ratio of F38 was studied by wide-angle X-ray diffraction, field emission scanning electron microscopy and Doppler broadening of positron annihilation radiation spectroscopy based on a slow positron beam. By loading more F38, the crystallization of TiO2 films is enhanced, accompanied by a decrement in oxygen vacancies/grain boundaries. Smaller and isolated mesopores are formed in the films prepared with F38 less than 15?wt%. The pore percolation occurs when the weight ratio of F38 is up to 20?wt% and larger and interconnected worm-like pores are formed. |
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| Keywords: | Positron annihilation Slow positron beam Doppler broadening Mesoporous film Titania film |
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