Synthesis and Characterization of a Nata De Coco Plasmonic Film Incorporating Zinc Nanoparticles as A Cuvette-Type Sensor Chip for Diazinon Pesticide Detection

Abstrak

This study aimed to synthesize and characterize a plasmonic film based on nata de coco incorporating zinc nanoparticles (ZnNPs) prepared using Phaleria macrocarpa fruit extract and to evaluate its performance as a cuvette-type sensor for diazinon pesticide detection using UV-Vis spectroscopy. FTIR analysis identified OH, aliphatic C-H, C=O, C=C, aromatic -CH, and Zn-O functional groups. UV-Vis analysis revealed an estimated nanoparticle size of 80.4 nm and a surface plasmon resonance (SPR) wavelength of 417.6 nm. Digital optical microscopy confirmed the non-uniform morphology of the ZnNPs and their effective deposition on the nata de coco matrix. Sensor validation demonstrated a recovery of 103.72%, an RSD of 0.852%, an LOD of 0.3 ppm, and an LOQ of 1.02 ppm, with favorable sensitivity, robustness, and ruggedness. These findings indicate that the nata de coco–ZnNP composite film has potential as a cuvette-type sensor for diazinon detection.