Desorption characteristics, of uncoated silicon microcantilever surfaces for explosive and common nonexplosive vapors

被引:25
作者
Pinnaduwage, LA
Thundat, T
Gehl, A
Wilson, SD
Hedden, DL
Lareau, RT
机构
[1] Univ Tennessee, Oak Ridge Natl Lab, Dept Phys, Knoxville, TN 37996 USA
[2] US Dept Homeland Secur, Atlantic City, NJ 08405 USA
关键词
desorption; explosive; TNT; PETN; RDX; microcantiliver;
D O I
10.1016/j.ultramic.2003.11.006
中图分类号
TH742 [显微镜];
学科分类号
摘要
We measured the desorption of explosive trinitrotoluene (TNT), pentaerythritol tetranitrate (PETN), and hexahydro-1,3,5-triazine (RDX) vapors from piezoresistive silicon microcantilevers under ambient air. Depending on the amount of vapor loaded on the cantilever, TNT desorption took a few minutes to tens of minutes (for nanogram quantities). On the other hand, no significant loss of PETN or RDX was observed after many hours. We also measured desorption of common "nonexplosive" compounds (water, acetone, and ethyl alcohol) and observed that desorption was too fast to be measured. There is a good correlation between the desorption time and the melting point (or the vapor pressure) of a particular substance. In principle, this method can be used to measure desorption rates of various substances from cantilever surfaces. (C) 2004 Elsevier B.V. All rights reserved.
引用
收藏
页码:211 / 216
页数:6
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