Dual Functional Molecular Imprinted Polymer-Modified Organometal Lead Halide Perovskite: Synthesis and Application for Photoelectrochemical Sensing of Salicylic Acid

Abstract

This work reports the synthesis of dual functional molecularly imprinted polymer (MIP)-modified organometal lead halide perovskite (CH₃NH₃PbI₃) and its application for photoelectrochemical (PEC) bioanalysis of salicylic acid (SA). Specifically, the CH₃NH₃PbI₃ was encapsulated into the MIPs via a simple thermal polymerization process on the indium tin oxide (ITO) glass, and the as-obtained MIPs/CH₃NH₃PbI₃/ITO electrode was characterized by various techniques, which revealed that the MIPs could not only stabilize CH₃NH₃PbI₃ but also improve the electron-hole separation efficiency of CH₃NH₃PbI₃ under light illumination. In the detection of model analyte SA, the PEC sensor, with numerous amounts of recognition sites to SA, exhibited desirable performance in terms of good sensitivity, selectivity, stability, and feasibility for real sample analysis. This work not only featured the use of MIPs/CH₃NH₃PbI₃ for PEC detection of SA but also provided a new horizon for the design and implementation of functional polymers/perovskite materials in the field of PEC sensors and biosensors.