Restructuring in bimetallic core-shell nanoparticles: Real time observation

TL;DR

This study introduces a real-time acoustic technique to observe the formation and restructuring of bimetallic core-shell nanoparticles during sputtering, revealing rapid atomic rearrangements influenced by element diffusivity.

Contribution

It presents a novel acoustic method for in situ observation of nanoparticle restructuring and provides insights into the dynamics of alloy formation during synthesis.

Findings

Real-time observation of nanoparticle formation and restructuring.

Au diffusivity significantly influences nanoparticle structure.

Restructuring occurs rapidly during synthesis.

Abstract

The formation process of core-shell bimetallic nanoparticles synthesized by sputtering onto a substrate is observed in real time using an originally developed acoustic technique. The technique enables us to evaluate the structural change of nanoparticles at room temperature without contacting the nanoparticles or substrate. In the experiments, the sputtering of metal A followed by metal B tended to form B-shell/A-core nanoparticles. However, in Pd-Au alloy system, notable restructuring occurred during synthesis, resulting in the formation of A-shell/B-core nanoparticles. The formation process is analyzed using the molecular dynamics simulation, revealing that this restructuring occurs on a short timescale, and high diffusivity of Au plays an important role.