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 48 条

[11] 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
[12] Development of pore interconnectivity/morphology in porous silica films investigated by cyclic voltammetry and slow positron annihilation spectroscopy
Tang, Xiuqin
Xiong, Bangyun
Li, Qichao
Mao, Wenfeng
Xiao, Wei
Fang, Pengfei
He, Chunqing
ELECTROCHIMICA ACTA, 2015, 168 : 365 - 369
[13] Argon Plasma Decomposition of Porogen in Mesoporous Silica Films Studied by Positron Annihilation
He, Chunqing
Ito, Kenji
Oka, Toshitaka
Kobayashi, Yoshinori
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POSITRON AND POSITRONIUM CHEMISTRY X, 2013, 733 : 193 - +
[14] Positron Beam Characterization of Silica Thin Films with Structurally Ordered Porosity
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Qin, X. B.
Wang, Q. Z.
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Zhong, Y. R.
Li, Z. X.
Wang, B. Y.
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POSITRON AND POSITRONIUM CHEMISTRY, 2009, 607 : 99 - +
[15] On determining the entrance size of cage-like pores in mesoporous silica films by positron annihilation lifetime spectroscopy
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CHEMICAL PHYSICS LETTERS, 2013, 590 : 97 - 100
[16] Positron annihilation in latex-templated macroporous silica films: pore size and ortho-positronium escape
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Guillemot, F.
Corbel, C.
Boilot, J-P
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NEW JOURNAL OF PHYSICS, 2012, 14
[17] Positron annihilation study of pore size in ordered SBA-15
Sousa, A.
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Sousa, E. M. B.
JOURNAL OF NON-CRYSTALLINE SOLIDS, 2008, 354 (42-44) : 4800 - 4805
[18] Effect of synthesis temperature on the ordered pore structure in mesoporous silica studied by positron annihilation spectroscopy
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[19] Porosity evaluation and positron annihilation study of mesoporous aluminum oxy-hydroxide ceramics
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APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING, 2020, 126 (06):
[20] Porosity evaluation and positron annihilation study of mesoporous aluminum oxy-hydroxide ceramics
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S. Samarin
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Applied Physics A, 2020, 126

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