Cooling dynamics and thermal interface resistance of glass-embedded metal nanoparticles
Résumé
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.
Mots clés
acoustic impedance
antimony compounds
arsenic compounds
barium compounds
cooling
gold
gold alloys
high-speed optical techniques
lead compounds
nanocomposites
nanoparticles
phosphate glasses
potassium compounds
silicon compounds
silver
silver alloys
sodium compounds
surface plasmon resonance
thermal conductivity
thermal diffusion
thermal resistance
time resolved spectra
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