Novel Fluorescence Sensor Based on All-Inorganic Perovskite Quantum Dots Coated with Molecularly Imprinted Polymers for Highly Selective and Sensitive Detection of Omethoate

Abstract

All-inorganic cesium lead halide perovskites (CsPbX 3 , X = Cl, Br, and I) have attracted considerable attention with superior electrical and photophysical properties. In this study, luminescent perovskite (CsPbBr 3 ) quantum dots (QDs) as sensing elements combined with molecularly imprinted polymers (MIPs) are used for the detection of omethoate (OMT). The new MIPs@CsPbBr 3 QDs were synthesized successfully through the imprinting technology with a sol− gel reaction. The fluorescence (FL) of the MIPs@CsPbBr 3 QDs was quenched obviously on loading the MIPs with OMT, the linear range of OMT was from 50 to 400 ng/mL, and the detection limit was 18.8 ng/mL. The imprinting factor was 3.2, which indicated excellent specificity of the MIPs for the inorganic metal halide (IMH) perovskites. The novel composite possesses the outstanding FL capability of CsPbBr 3 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 FL intensity. Hence, a selective and simple FL sensor for direct and fast detection of organophosphorus pesticide in vegetable and soil samples was developed here. The present work also illustrates the potential of IMH perovskites for sensor applications in biological and environmental detection.

Study on MA(Pb,Cu)Br3 Provskite Nanocrystal with Both Controlled Color Emission and Improved Stability

“…(3) The fluorescence properties of the MA(Pb, Cu)Br 3 perovskite quantum dots manifested as stronger temperature dependence, which is expected to be widely used in the field of temperature sensors. [38,39]…”

Metal Halide Perovskite@Metal‐Organic Framework Hybrids: Synthesis, Design, Properties, and Applications

“…Despite the huge potential of using pristine MHPs as sensors, improving the water resistivity and long‐term stability in real, complex environments remains a greatest challenge in this field. [ 208–213 ] Recently, Xia and co‐workers reported a CH 3 NH 3 PbBr 3 @MOF‐5hybrid showing excellent water resistivity and thermal stability for selective and sensitive heavy metal ion detection. [ 196 ] Due to the stable thermal stability and good water resistance, the hybrid was tested for metal ion sensing in an aqueous medium.…”

Recent advances in synthesis and application of perovskite quantum dot based composites for photonics, electronics and sensors

“…Besides these strategies, CsPbBr 3 QDs/ethylene vinyl acetate (EVA) composite with long-term stability and great flexibility was obtained by Li et al via onepot RT-synthesis through recrystallization of CsPbBr 3 QDs and dissolution of EVA [107]. And for specific application, Huang's team in 2018 and Tana et al in 2019 adopted molecularly imprinted polymers (MIPs) for sensitive detection [108,109], and Xuan et al employed hydrophobic porous polymer frameworks (SHFW) to obtain HP-QDs-based composite with extraordinary water-resistant performance [ composites were obtained via a similar process. Enhanced optical properties of these heterojunctions were also reported which benefit from the greater energy band gap and ionization potential of Al 2 O 3 and ZrO 2 to intense emission [106], and lower conductive level of TiO 2 and SnO 2 to speed up the electron injection [111].…”