Department of Petrochemicals, Egyptian Petroleum Research Institute, Cairo 11727, Egypt.
Department of Materials Convergence and System Engineering, Changwon National University, Changwon 51140, Republic of Korea.
Analyst. 2021 May 7;146(9):2894-2901. doi: 10.1039/d1an00166c. Epub 2021 Mar 15.
The design of multifunctional sensors based on biocompatible hybrid materials consisting of conjugated polythiophene-quantum dots for multiple environmental pollutants is a promising strategy for the development of new monitoring technologies. Herein, we present a new approach for the "on-off-on" sensing of Hg and triacetone triperoxide (TATP) based on amphiphilic polythiophene-coated CdTe QDs (PQDs, PLQY ∼78%). The emission of the PQDs is quenched by Hg ions via electron transfer interactions. Based on the strong interaction between TATP and Hg ions, the addition of TATP to the PQD-Hg complex results in a remarkable recovery of the PQD emission. Under the optimized conditions, the PQD sensor shows a good linear response to Hg and TATP with detection limits of 7.4 nM and 0.055 mg L, respectively. Furthermore, the "on-off-on" sensor demonstrates good biocompatibility, high stability, and excellent selectivity in the presence of other metal ions and common explosives. Importantly, the proposed method can be used to determine the level of Hg and TATP in environmental water samples.
基于由共轭聚噻吩-量子点组成的生物相容性杂化材料的多功能传感器的设计是开发新型监测技术的有前途的策略。在此，我们提出了一种基于两亲性聚噻吩包覆的 CdTe QDs（PQDs，PLQY∼78%）的用于“关-开-关”检测 Hg 和三丙酮三过氧化物（TATP）的新方法。Hg 离子通过电子转移相互作用使 PQDs 的发射猝灭。基于 TATP 和 Hg 离子之间的强相互作用，将 TATP 添加到 PQD-Hg 复合物中会导致 PQD 发射显著恢复。在优化条件下，PQD 传感器对 Hg 和 TATP 表现出良好的线性响应，检测限分别为 7.4 nM 和 0.055 mg L。此外，在存在其他金属离子和常见爆炸物的情况下，“关-开-关”传感器表现出良好的生物相容性、高稳定性和优异的选择性。重要的是，所提出的方法可用于测定环境水样中的 Hg 和 TATP 水平。
