Chemistry Branch Naval Air Warfare Center, Weapons Division (NAWCWD) Research Directorate, CA 93555, USA.
Nanotechnology. 2017 Jan 6;28(1):015501. doi: 10.1088/0957-4484/28/1/015501. Epub 2016 Nov 29.
AgInS (AIS) quantum dots (QDs) were synthesized via a thermal decomposition reaction with dodecylamine as the ligand to help stabilize the QDs. This reaction procedure is relatively easy to implement, scalable to large batches (up to hundreds of milligrams of QDs are produced), and a convenient method for the synthesis of chalcogenide QDs. Metal powders of AgNO and In(NO), were used as the metal precursors while diethyldithiocarbamate was used as the sulfur source. The AIS QDs were characterized via transmission electron microscopy, atomic force microscopy, and energy dispersive x-ray spectroscopy. As an application for these less toxic nanomaterials, we demonstrate the selective detection of Trinitrotoluene (TNT) at concentrations as low as 6 micromolar (μM) and without the functionalization of a ligand that is specifically designed to interact with TNT molecules. We also demonstrate a simple approach to patterning the AIS QDs onto filter paper, for the detection of TNT molecules by eye. Collectively, the ease of the synthesis of the less toxic AIS QDs, and the ability to detect TNT molecules by eye suggest an attractive route to highly sensitive and portable substrates for environmental monitoring, chemical warfare agent detection, and other applications.
AgInS(AIS)量子点(QD)通过热分解反应合成，使用十二胺作为配体来帮助稳定 QD。该反应过程相对容易实施，可规模化生产大量 QD（可生产多达数百毫克的 QD），是合成硫属化物 QD 的一种便捷方法。AgNO 和 In(NO)的金属粉末用作金属前体，而二乙基二硫代氨基甲酸盐则用作硫源。通过透射电子显微镜、原子力显微镜和能量色散 X 射线能谱对 AIS QD 进行了表征。作为对这些低毒纳米材料的应用，我们展示了对浓度低至 6 微摩尔（μM）的三硝基甲苯（TNT）的选择性检测，而无需使用专门设计用于与 TNT 分子相互作用的配体进行功能化。我们还展示了一种简单的方法，即将 AIS QD 图案化到滤纸上，用于通过肉眼检测 TNT 分子。总的来说，合成低毒 AIS QD 的简便性以及通过肉眼检测 TNT 分子的能力，为环境监测、化学战剂检测和其他应用提供了极具吸引力的高灵敏度和便携式基底。
