Ag Nanoparticles Decorated by Gallic Acid as a Colorimetric Sensor for the Detection of Cartap Pesticide

This study presents a facile approachfor synthesizing gallic acid-cappedsilver nanoparticles (GA-AgNPs). GA-AgNPs were synthesized under theoptimized conditions and characterized using various techniques [ultraviolet-visible,Fourier-transformed infrared (FTIR), X-ray diffraction, and transmissionelectron microscopy]. GA-AgNPs were spherical in shape with an averagediameter of 11.2 nm. The FTIR and zeta potential analyses proved thepresence of GA on the surface of AgNPs, stabilizing the nanoparticles.GA-AgNPs were used for the colorimetric detection of cartap (S,S & PRIME;-[2-(dimethylamino)-1,3-propanediyl]dicarbamothioate).GA-AgNPs were highly selective and sensitive to cartap, with a detectionlimit of 0.059 ppm in a linear range of 0.1-2.0 ppm. Finally,the application of GA-AgNPs was validated by determining cartap inrice samples.