Visual Detection of Thiocyanate Based on Fabry–Perot Etalons with a Responsive Polymer Brush as the Transducer
Jinqiu Lv, Dan Chen, Yunhao Du, Tieqiang Wang, Xuemin Zhang, Yunong Li, Liying Zhang, Yan Wang, Rainer Jordan, Yu Fu
Abstract
The detection of thiocyanate (SCN–) is particularly important in industrial effluents and biological fluids because of the toxic nature of SCN–. Herein, a metal–insulator–metal (MIM) resonator for visual detection of SCN– is presented based on a poly[(2-(methacryloyloxy)ethyl) trimethylammonium chloride] (PMETAC) brush. The MIM resonator exhibits obvious color change as the concentration of SCN– changes, which can be easily distinguished by the naked eyes. In addition, the as-prepared MIM resonator also shows the advantages of good anti-interference, excellent reusability, and fast response rate. Combining the above advantages, the proposed MIM resonator may provide a broad perspective for a wide variety of visible-light applications.