Study of mesoporous silica films by positron annihilation based on a slow positron beam: Effects of preparation conditions on pore size and open porosity

被引：17

作者：

He, Chunqing ^{[1
]}

Suzuki, Ryoichi ^{[1
]}

Ohdaira, Toshiyuki ^{[1
]}

Oshima, Nagayasu ^{[1
]}

Kinomura, Atsushi ^{[1
]}

Muramatsu, Makoto ^{[1
]}

Kobayashi, Yoshinori ^{[1
]}

机构：

[1] Natl Inst Adv Ind Sci & Technol, AIST, Tsukuba, Ibaraki 3058565, Japan

来源：

CHEMICAL PHYSICS | 2007年 / 331卷 / 2-3期

基金：

日本学术振兴会;

关键词：

positronium; slow positron beam; micropore; mesopore; copolymer; silica film;

D O I：

10.1016/j.chemphys.2006.10.016

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：

Positron annihilation spectroscopy (PAS) based on an intense pulsed slow positron beam was applied to the study of mesoporous silica films, synthesized using tetraethyl orthosilicate (TEOS) as the network precursor and a triblock copolymer (EO106PO70EO106) as the structure-directing agent. With positron annihilation lifetime spectroscopy (PALS), pore sizes were obtained from ortho-positronium (o-Ps) lifetimes of the films capped with a 20 nm thick SiO2 layer. Influences of preparation conditions such as heating, TEOS vapor infiltration and precursor solution ageing on the pore size were studied. Moreover, the effect of ageing of the precursor solution on film pore interconnectivity/open porosity was investigated through lifetime-energy correlation measurements by observing intrinsic annihilation of o-Ps diffused out from the uncapped film surface. (c) 2006 Elsevier B.V. All rights reserved.

引用

页码：213 / 218

页数：6

共 11 条

[1] Positron annihilation studies of mesoporous silica films using a slow positron beam
He, CQ
Muramatsu, M
Ohdaira, T
Kinomura, A
Suzuki, R
Ito, K
Kabayashi, Y
APPLIED SURFACE SCIENCE, 2006, 252 (09) : 3221 - 3227
[2] Mesoporous titania films investigated by positron annihilation based on a slow positron beam
Xiong, Bangyun
Tang, Xiuqin
He, Chunqing
Cao, Hui
Huo, Jingpei
Luo, Jie
He, Haiying
CHINESE JOURNAL OF PHYSICS, 2018, 56 (01) : 355 - 361
[3] Ageing-induced enhancement of open porosity of mesoporous silica films studied by positron annihilation spectroscopy
He, Chunqing
Muramatsu, Makoto
Oshima, Nagayasu
Ohdaira, Toshiyuki
Kinomura, Atsushi
Suzuki, Ryoichi
PHYSICS LETTERS A, 2006, 355 (01) : 73 - 76
[4] Positron beam analysis of structurally ordered porosity in mesoporous silica thin films
van Veen, A
Galindo, RE
Schut, H
Eijt, SWH
Falub, CV
Balkenende, AR
de Theije, FK
MATERIALS SCIENCE AND ENGINEERING B-SOLID STATE MATERIALS FOR ADVANCED TECHNOLOGY, 2003, 102 (1-3): : 2 - 7
[5] Positron and positronium annihilation in silica-based thin films studied by a pulsed positron beam
Suzuki, R
Ohdaira, T
Kobayashi, Y
Ito, K
Shioya, Y
Ishimaru, T
RADIATION PHYSICS AND CHEMISTRY, 2003, 68 (3-4) : 339 - 343
[6] Mesoporosity in silica films studied by a slow positron beam and ellipsometry
Xiong, Bangyun
Mao, Wenfeng
Yue, Jin
Xu, Xusheng
He, Chunqing
PHYSICS LETTERS A, 2014, 378 (03) : 249 - 253
[7] Tunable pores in mesoporous silica films studied using a pulsed slow positron beam
He, Chunqing
Muramatsu, Makoto
Ohdaira, Toshiyuki
Oshima, Nagayasu
Kinomura, Atsushi
Suzuki, Ryoichi
Kobayashi, Yoshinori
RADIATION PHYSICS AND CHEMISTRY, 2007, 76 (02) : 204 - 208
[8] Argon Plasma Decomposition of Porogen in Mesoporous Silica Films Studied by Positron Annihilation
He, Chunqing
Ito, Kenji
Oka, Toshitaka
Kobayashi, Yoshinori
Ohdaira, Toshiyuki
Suzuki, Ryoichi
POSITRON AND POSITRONIUM CHEMISTRY X, 2013, 733 : 193 - +
[9] Positron Beam Characterization of Silica Thin Films with Structurally Ordered Porosity
Yu, R. S.
Qin, X. B.
Wang, Q. Z.
Zhang, Z.
Zhong, Y. R.
Li, Z. X.
Wang, B. Y.
Wei, L.
Jia, Q. J.
Kurihara, T.
POSITRON AND POSITRONIUM CHEMISTRY, 2009, 607 : 99 - +
[10] Effect of synthesis temperature on the ordered pore structure in mesoporous silica studied by positron annihilation spectroscopy
Li, C. Y.
Qi, N.
Liu, Z. W.
Zhou, B.
Chen, Z. Q.
Wang, Z.
APPLIED SURFACE SCIENCE, 2016, 363 : 445 - 450

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