Hot-Carrier Generation in Bimetallic Janus Nanoparticles
Hanwen Jin, Chengcheng Xiao, Matias Herran, Emiliano Cortés, Shiwu Gao, Johannes Lischner
TL;DR
This paper studies how bimetallic Janus nanoparticles generate hot carriers under light, which could improve nanoscale devices for energy and sensing.
Contribution
A novel atomistic modeling approach is used to study hot-carrier generation in bimetallic Janus nanoparticles.
Findings
Ag–Au Janus nanoparticles show the highest hot-carrier generation rate under solar illumination.
Dumbbell-shaped nanoparticles exhibit increased hot-carrier generation with larger neck sizes due to enhanced electric fields.
Maximum hot-carrier generation occurs when light polarization is perpendicular to the metal interface.
Abstract
Energetic electrons and holes generated from the decay of localized surface plasmons in metallic nanoparticles can be harnessed in nanoscale devices for photocatalysis, photovoltaics or sensing. In this work, we study the generation of such hot carriers in bimetallic Janus nanoparticles composed of Au, Ag and Cu using a recently developed atomistic modeling approach that combines a solution of the macroscopic Maxwell equation with large-scale quantum-mechanical tight-binding models. We first analyze spherical Janus nanoparticles whose unique hot-carrier spectrum can be associated with the spectra of the two hemispheres and the interface coupling and find that under solar illumination the Ag–Au system exhibits the highest hot-carrier generation rate. For dumbbell-shaped Janus nanoparticles, we observe a significant increase in hot-carrier generation with increasing neck size. This is…
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Taxonomy
TopicsPickering emulsions and particle stabilization · Gold and Silver Nanoparticles Synthesis and Applications · Laser-Ablation Synthesis of Nanoparticles