Adsorption of Trinitrotoluene on Uncoated Silicon Microcantilever Surfaces
We measured the adsorption characteristics of trinitrotoluene (TNT) on piezoresistive silicon microcantilever surfaces under ambient air using a well-characterized TNT vapor generator. This allowed us to quantify the adsorption parameters and to estimate the sticking coefficient. The sticking coeffi...
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| Veröffentlicht in: | Langmuir 2004-03, Vol.20 (7), p.2690-2694 |
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| creator | Pinnaduwage, L. A Yi, D Tian, F Thundat, T Lareau, R. T |
| description | We measured the adsorption characteristics of trinitrotoluene (TNT) on piezoresistive silicon microcantilever surfaces under ambient air using a well-characterized TNT vapor generator. This allowed us to quantify the adsorption parameters and to estimate the sticking coefficient. The sticking coefficient initially increases with TNT exposure time and then levels off around 0.3. Atomic force microscopy images of silicon surfaces exposed to TNT revealed “island” formation of the adsorbate on the silicon surface. At low exposure times, mainly the number density of islands increased with exposure time; at longer exposure times, the size (in particular, height) of the islands grew, corresponding to the higher sticking coefficients. These observations can be qualitatively explained via the difference between TNT−surface and TNT−TNT interactions mediated by water molecules. |
| doi_str_mv | 10.1021/la035658f |
| format | Article |
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At low exposure times, mainly the number density of islands increased with exposure time; at longer exposure times, the size (in particular, height) of the islands grew, corresponding to the higher sticking coefficients. 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| subjects | Adsorption Microchemistry Microscopy, Atomic Force - methods Sensitivity and Specificity Silicon - chemistry Surface Properties Time Factors Trinitrotoluene - chemistry |
| title | Adsorption of Trinitrotoluene on Uncoated Silicon Microcantilever Surfaces |
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