期刊
PHYSICAL REVIEW B
卷 80, 期 19, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.80.195406
关键词
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
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 nanoparticle-glass interface and heat diffusion in the glass matrix. Moreover, the interface conductances are deduced from the experiments and found to be correlated with the acoustic impedance mismatch at the metal/glass interface.
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