Laboratoire Nanomatériaux pour les Systèmes Sous Sollicitations Extrêmes (NS3E), UMR 3208 ISL/CNRS/UNISTRA, French-German Research Institute of Saint-Louis, 5 rue du Général Cassagnou, 68300 Saint-Louis, France.
Laboratoire Nanomatériaux pour les Systèmes Sous Sollicitations Extrêmes (NS3E), UMR 3208 ISL/CNRS/UNISTRA, French-German Research Institute of Saint-Louis, 5 rue du Général Cassagnou, 68300 Saint-Louis, France.
J Hazard Mater. 2021 Mar 15;406:124672. doi: 10.1016/j.jhazmat.2020.124672. Epub 2020 Nov 28.
Microgravimetric sensor platforms with physico- or chemo-selective interfaces offer promising sensing properties. They are widely used to detect chemical warfare agents (CWAs). However, a comprehensive insight into adsorption mechanisms and interactions between low concentrations of these adsorbates and low-mass adsorbents is still lacking. In this study, we report a complete and detailed analytical method to model the adsorption processes of low traces of vapor-phase DiMethyl MethylPhosphonate (DMMP), a conventional simulant of CWAs, on a double-side nanostructured microcantilever coated with vertically-aligned titanium dioxide nanotubes (TiO-NTs). We find that the geometrical configuration of NTs plays an important role in the diffusion regimes of molecules during the adsorption. This study shines light on the adsorption and kinetic mechanisms of low-traces DMMP offering opportunities to have a better insight of the adsorption of CWAs on complex nanostructures and to improve microcantilever sensors.
具有物理或化学选择性界面的微量传感器平台具有有前途的传感特性。它们被广泛用于检测化学战剂（CWA）。然而，对于这些吸附物在低浓度下与低质量吸附剂之间的吸附机制和相互作用，仍缺乏全面的了解。在这项研究中，我们报告了一种完整而详细的分析方法，用于模拟低浓度气相二甲基甲基膦酸酯（DMMP）的吸附过程，DMMP 是 CWA 的常规模拟物，在涂有垂直排列的二氧化钛纳米管（TiO-NTs）的双面纳米结构微悬臂梁上。我们发现，在吸附过程中，NTs 的几何构型对分子的扩散状态起着重要作用。这项研究揭示了低浓度 DMMP 的吸附和动力学机制，为更好地了解 CWA 在复杂纳米结构上的吸附提供了机会，并为改进微悬臂梁传感器提供了机会。
