Cooling dynamics and thermal interface resistance of glass-embedded metal nanoparticles

TL;DR

This study investigates the cooling behavior of glass-embedded noble metal nanoparticles using ultrafast spectroscopy, revealing how interface resistance and heat diffusion influence cooling rates and linking conductance to acoustic impedance mismatch.

Contribution

It provides new insights into the thermal interface resistance and cooling dynamics of metal nanoparticles embedded in glass, using experimental ultrafast spectroscopy data.

Findings

Cooling dynamics depend on interface resistance and heat diffusion.

Interface conductance correlates with acoustic impedance mismatch.

Nanoparticle size influences cooling behavior.

Abstract

The cooling dynamics of glass-embedded noble metal nanoparticles with diameters ranging from 4 to 26 nm were studied using ultrafast pump-probe spectroscopy. Measurements were performed probing away from the surface plasmon resonance of the nanoparticles to avoid spurious effects due to glass heating around the particle. In these conditions, the time-domain data reflect the cooling kinetics of the nanoparticle. Cooling dynamics are shown to be controlled by both thermal resistance at the nanoparticule?glass interface, and heat diffusion in the glass matrix. Moreover, the interface conductances are deduced from the experiments and found to be correlated to the acoustic impedance mismatch at the metal/glass interface.