Center for Bioelectronics and Biosensors, Biodesign Institute, and Department of Electrical Engineering, Arizona State University, Tempe, Arizona 85287, USA.
Nano Lett. 2010 Feb 10;10(2):380-4. doi: 10.1021/nl902382s.
Real-time detection of trace chemicals, such as explosives, in a complex environment containing various interferents has been a difficult challenge. We describe here a hybrid nanosensor based on the electrochemical reduction of TNT and the interaction of the reduction products with conducting polymer nanojunctions in an ionic liquid. The sensor simultaneously measures the electrochemical current from the reduction of TNT and the conductance change of the polymer nanojunction caused from the reduction product. The hybrid detection mechanism, together with the unique selective preconcentration capability of the ionic liquid, provides a selective, fast, and sensitive detection of TNT. The sensor, in its current form, is capable of detecting parts-per-trillion level TNT in the presence of various interferents within a few minutes.
实时检测复杂环境中痕量化学物质（如爆炸物）一直是一个具有挑战性的难题，其中包含各种干扰物。我们在此描述了一种基于 TNT 的电化学还原以及在离子液体中与导电聚合物纳结相互作用的混合纳米传感器。该传感器同时测量 TNT 还原产生的电化学电流以及聚合物纳结因还原产物导致的电导变化。混合检测机制，以及离子液体独特的选择性预浓缩能力，提供了对 TNT 的选择性、快速和灵敏检测。该传感器在其当前形式下，能够在几分钟内检测到存在各种干扰物时的万亿分之几水平的 TNT。
