Electronic dephasing in bimetallic gold-silver nanoparticles examined by single particle spectroscopy
Electronic dephasing in bimetallic gold-silver nanoparticles examined by single particle spectroscopy
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DOI：
10.1021/jp054233u
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发表时间：
2005-11-03
影响因子：
3.3
通讯作者：
Hartland, GV
中科院分区：
文献类型：
--
作者：
Wang, X;Zhang, ZY;Hartland, GV
用暗场显微镜研究了单个金、银和金-银复合核壳粒子和合金粒子的散射光谱。结果表明，银纳米粒子的等离子体共振比纯银或纯金粒子的等离子体共振宽。然而，核-壳和合金样品的等离子体共振的宽度与共振频率的曲线非常相似。这意味着加宽是由于粒子的介电常数的频率依赖性。对于核-壳颗粒，在两种金属之间的界面处的散射似乎不是显著的效果。
The scattering spectra of single gold, silver, and bimetallic gold-silver particles (both core-shell and alloyed) have been examined using dark-field microscopy. The results show that the plasmon resonances for the bimetallic particles are broader than those of the pure silver or pure gold particles. However, plots of the width of the plasmon resonance vs resonance frequency for the core-shell and alloyed samples are very similar. This implies that the broadening is due to the frequency dependence of the dielectric constants of the particles. For the core-shell particles, scattering at the interface between the two metals does not seem to be a significant effect.