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Reference type: Journal
Authors: Huang SY, Guo ML, Tan JA, Geng YY, Wu JY, Tang YW, Su CC, Lin CC, Liang Y
Article Title: Novel Fluorescence Sensor Based on All-Inorganic Perovskite Quantum Dots Coated with Molecularly Imprinted Polymers for Highly Selective and Sensitive Detection of Omethoate.
Publication date: 2018
Journal: ACS Applied Materials & Interfaces
DOI: 10.1021/acsami.8b14472

Abstract: All-inorganic cesium lead halide perovskites (CsPbX3, X = Cl, Br, I) have attracted considerable attention with superior electrical and photophysical properties. In the study, luminescent perovskite (CsPbBr3) quantum dots (QDs) as sensing elements combined with molecularly imprinted polymers (MIPs) are used for the detection of omethoate (OMT). The new MIPs@CsPbBr3 QDs were synthesized successfully through the imprinting technology with a sol-gel reaction. The fluorescence of the MIPs@CsPbBr3 QDs was quenched obviously on loading the MIPs with OMT, the linear range of OMT was from 50 ng/mL to 400 ng/mL, and the detection limit was 18.8 ng/mL. The imprinting factor (IF) was 3.2, which indicated excellent specificity of the MIPs for the inorganic metal halide (IMH) perovskites. The novel composite possesses the outstanding fluorescence capability of CsPbBr3 QDs and the high selectivity of molecular imprinting technology, which can convert the specific interactions between template and the imprinted cavities to apparent changes in the fluorescence (FL) intensity. Thence, a selective and simple fluorescence sensor for direct and fast detection of organophosphorus (OP) pesticide in vegetable and soil samples were developed here. The present work also illustrates the potential of IMH perovskites for sensor applications in biological and environmental detection


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