Application of silver - gold nanomaterials with core - shell structure in fiber optic sensors to detect pesticide residues

Abstract

    Therefore, measures to help monitor and examine the level of pesticide remains in agricultural products play a vital role in the development of  farming industry in Viet Nam. The present study developed an optical fiber sensor based on a core-shell structure of gold-silver material. Ag@Au NPs material particles were synthesized by chemical reduction method with a particle size of about 80 nm and were coated on the core of optical fibers through special bonds of Ag and Au with –NH₂ groups. The detection limit of this sensor tested with quinalphos reagent reached 3.043 × 10⁻¹² M. The results of this study contribute as an essential platform for the development of optical fiber sensors in the agricultural as well as other fields.