Speciation of energetic materials on a microcantilever using surface reduction

被引:5
|
作者
Yi, Dechang [1 ]
Senesac, Larry [1 ,2 ]
Thundat, Thomas [1 ,2 ]
机构
[1] Oak Ridge Natl Lab, Oak Ridge, TN 37831 USA
[2] Univ Tennessee, Dept Phys, Knoxville, TN 37996 USA
关键词
microcantilevers; surface reduction; receptor-free sensing; explosive molecules;
D O I
10.1002/sca.20096
中图分类号
TH7 [仪器、仪表];
学科分类号
0804 ; 080401 ; 081102 ;
摘要
Although microcantilevers have been used to detect explosives with extremely high sensitivity using variations in adsorption-induced bending and resonance frequency, obtaining selectivity remains a challenge. Reversible chemoselectivity at ambient temperatures based on receptor-based detection provides only limited selectivity due to the generality of chemical interactions. The oxygen imbalance in secondary explosives presents a means to achieve receptor-free speciation of explosives using surface reduction of adsorbed molecules. We demonstrate highly selective and realtime detection of Trinitrotoluene (TNT) using a copper oxide-coated cantilever with a surface reduction approach. Not only can this technique exclusively differentiate explosives from nonexplosives, but also it has the potential to specify individual explosives such as TNT, pentaerythritol tetranitrate (PETN), and RDX. This technique together with receptor-based detection techniques provides a multimodal approach for achieving very high selectivity.
引用
收藏
页码:208 / 212
页数:5
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