Distinct absorption transducing features of silica supported MoO3/PANI hybrid coated optical fiber towards Malathion monitoring in food samples

Abstract

This work will show, for the first time, the absorptive silica-supported polyaniline (PANI) molybdenum trioxide (MoO3) semiconductor hybrid coating onto the optical fiber realizing the concept of lossy mode resonance (LMR) incorporated with molecular imprinting (MIP)-based sensors. The unique optical absorptive and imprinting (IP) properties and possessing a proper refractive index, introducing a versatile optical transducer, were assessed in the detection of Malathion (MAL) to address the rising concern of pesticide residue in crops. The accurate structural and morphological characterization confirmed the rough crystalline and spherical particles for a ternary composite of PANI, SiO2, and MoO3 onto an optical fiber curved surface while spectroscopic analysis confirms the formation of imprinting polymer and desirable absorbance characteristics. The experimental and numerical sensing studies revealed that the proposed sensing probe allows the rapid adsorption/desorption of MAL to the sensing films and highly permeable coating under studying the effective parameters influence. The optimized probe exhibits an excellent performance with the maximum sensitivity of within 14–224 µM with the linearity coefficient of R2 = 0.99 possessing a low limit of detection of 9.1 nM. Additionally, this sensor selectively detects. in the presence of other real species and also showed good recovery in the various corps samples.