期刊
CHINESE JOURNAL OF PHYSICS
卷 56, 期 1, 页码 355-361出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.cjph.2017.11.012
关键词
Positron annihilation; Slow positron beam; Doppler broadening; Mesoporous film; Titania film
资金
- National Natural Science Foundation of China (NSFC) [11375132, 11705029]
- Natural Science Foundation of Guangdong Province, China [2017A030313038]
- Foundation for Distinguished Young Talents in Higher Education of Guangdong, China [2014KQNCX185]
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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