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Published on: September 14, 2017
Enzymatic Modulating Zinc-Air Battery-Based Self-Powered Sensor Coupling Photoactive Covalent Organic Framework for
Xianzhou Cai1, Qian Cui1, Ting Bao1
1Collaborative Innovation Center for Advanced Organic Chemical Materials Co-constructed by the Province and Ministry, Ministry of Education Key Laboratory for the Synthesis and Application of Organic Functional Molecules, Hubei Key Laboratory for Precision Synthesis of Small Molecule Pharmaceuticals, College of Chemistry and Chemical Engineering, Hubei University, Wuhan 430062, P. R. China.
Abstract:
Self-powered electrochemical sensors (SPES) have gained significant attention with the characteristics of portability, high sensitivity, and no requirement of an external power supply. Herein, a novel photoassisted zinc-air battery-based SPES (PZAB-SPES) was developed for organophosphorus pesticide detection based on photoactive covalent organic framework (COF) and enzymatic modulation strategy. The in situ grown COF nanosheets not only acted as the photocathode but also served as nanocarriers of silver nanoparticles (AgNPs) to improve the photoelectric conversion efficiency with the surface plasmon resonance effect, which markedly increased the open-circuit voltage up to 1.469 V. Based on the aptamer-target recognition and efficient separation of magnetic beads, the alkaline phosphatase (ALP)-catalyzed reaction was triggered, resulting in the hydrolysis of sodium thiophosphate (TP) and the generation of hydrogen sulfide (H2S). The generated H2S caused the oxidation of AgNPs to form silver sulfide (Ag2S), which decreased the photoelectric conversion efficiency and inhibited the oxygen reduction reaction, leading to a decrease of the open-circuit voltage. As a proof of concept, the proposed PZAB-SPES exhibited good analytical performance for acetamiprid detection ranging from 0.01 to 1000 ng/mL, with a low detection limit of 1.1 pg/mL. This fascinating sensing platform provided an efficient method for organophosphorus pesticide detection, holding extensive application prospects in food safety and environmental monitoring.
