Evolution of pores in mesoporous silica films: Porogen loading effect

被引：10
|
作者：
He, Chunqing [1 ]
Oka, Toshitaka [1 ]
Kobayashi, Yoshinori [1 ]
Oshima, Nagayasu [1 ]
Ohdaira, Toshiyuki [1 ]
Kinomura, Atsushi [1 ]
Suzuki, Ryoichi [1 ]
机构：
[1] Natl Inst Adv Ind Sci & Technol, Tsukuba, Ibaraki 3058565, Japan
来源：
APPLIED SURFACE SCIENCE | 2008年 / 255卷 / 01期
关键词：
positronium; lifetime; gamma-ray energy spectroscopy; thin film; porogen;
D O I：
10.1016/j.apsusc.2008.05.302
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
Mesoporous silica films were synthesized via a sol-gel process under an acidic condition. Various amounts of triblock copolymer F38 were loaded to precursor sols as the pore generator. The evolution of the pores generated by porogen decomposition was investigated as a function of F38 loading by positron annihilation gamma-ray energy spectroscopy and positron annihilation lifetime spectroscopy based on slow positron beams. The threshold of pore percolation is found to be around 10 wt% of F38 loading by positron annihilation gamma-ray energy spectroscopy. Positron annihilation lifetime spectroscopy in the films show that the pore size increases from 1 nm to 3 nm with increasing F38 loading from 5 wt% to 30 wt%. (C) 2008 Elsevier B.V. All rights reserved.
引用
收藏
页码：183 / 186
页数：4
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