Influence of Reaction Time on the Optical Properties of Silver Nanoparticles Synthesized using Soluble Starch

Silver nanoparticles (AgNPs) have emerged as promising materials due to their remarkable optical properties, particularly surface plasmon resonance (SPR), which makes them suitable for applications in sensors, catalysis, and optoelectronic devices. However, conventional synthesis methods often involve hazardous chemicals, prompting a shift toward environmentally friendly approaches. This study investigates the optical properties of silver nanoparticles (AgNPs) biosynthesized using soluble starch at various reaction times (30, 60, 90, 120, 150, 180, 240, and 300 minutes). Soluble starch serves as a green, biocompatible reducing and stabilizing agent, enabling the formation of AgNPs under mild conditions. The optical properties of the synthesized nanoparticles were characterized using UV-Visible spectroscopy. The recorded spectra revealed surface plasmon resonance (SPR) absorption bands characteristic of AgNPs, with variations in peak intensity and position corresponding to different reaction times. These findings provide insights into the plasmonic behavior of starch-capped AgNPs and their tunability through reaction duration. The high visible light absorption exhibited by the nanoparticles suggests potential applicability in optoelectronic and photonic devices.