Proceedings of MATSUS Spring 2024 Conference (MATSUS24)
Publication date: 18th December 2023
Plasmonic nanoparticles can amplify electric fields, generate localized heating, and produce charged species with a limited lifetime when exposed to light. These effects can be applied in many practical fields, including nanomedicine and photocatalysis. However, it is necessary to understand their underlying mechanism and which parameters are necessary to improve their efficiency and control them. Therefore, it is crucial to study the electrochemical activity of nanoparticles under illumination to better comprehend their enhanced plasmonic activity and associated processes.
This study explores the photoelectrochemical behavior of plasmonic silver nanoparticles under illumination. We observe the generation of solvated electrons from silver nanoparticles under plasmonic resonance conditions (λ = 385 nm) in sodium nitrate electrolyte. By varying the applied bias, we infer that the photocurrent response comes from electron photoemission as predicted from Brodsky-Gurevich theory. Under off-resonance wavelengths, the solvated electron generation is reduced, which indicates an enhancement of electron generation from plasmons. Furthermore, the influence of the nanoparticles’ size to the photocurrent response was also investigated.
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