Analysis of porosity in porous silicon using hyperpolarized 129Xe two-dimensional exchange experiments

被引：25
|
作者：
Knagge, K
Smith, JR
Smith, LJ
Buriak, J
Raftery, D
机构：
[1] Purdue Univ, Dept Chem, HC Brown Lab, W Lafayette, IN 47907 USA
[2] Univ Alberta, NINT, Natl Res Council, Edmonton, AB T6G 2G2, Canada
[3] Univ Alberta, Dept Chem, Edmonton, AB T6G 2G2, Canada
来源：
SOLID STATE NUCLEAR MAGNETIC RESONANCE | 2006年 / 29卷 / 1-3期
基金：
美国国家科学基金会;
关键词：
NMR; xenon; optical pumping; hyperpolarization; laser-polarized xenon; porous silicon; EXSY; diffusion; magic angle spinning;
D O I：
10.1016/j.ssnmr.2005.10.001
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：
The porosity in porous silicon was characterized using hyperpolarized (HP) xenon as a probe. HP xenon under conditions of continuous flow allows for the rapid acquisition of xenon NMR spectra that can be used to characterize a variety of materials. Two-dimensional exchange spectroscopy (EXSY) Xe-129 NMR experiments using HP xenon were performed to obtain exchange pathways and rates of xenon mobility between pores of different dimensions within the structure of porous silicon and to the gas phase above the sample. Pore sizes are estimated from chemical shift information and a model for pore geometry is presented. (c) 2005 Elsevier Inc. All rights reserved.
引用
收藏
页码：85 / 89
页数：5
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