Exciton-plasmon interaction and hybrid excitons in semiconductor-metal nanoparticle assemblies
Exciton-plasmon interaction and hybrid excitons in semiconductor-metal nanoparticle assemblies
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DOI：
10.1021/nl0602140
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发表时间：
2006-05-01
期刊：
影响因子：
10.8
通讯作者：
Naik, Rajesh R.
中科院分区：
文献类型：
--
作者：
Govorov, Alexander O.;Bryant, Garnett W.;Naik, Rajesh R.
我们描述了由半导体和金属纳米粒子组成的杂化配合物中激子的物理性质。单个纳米颗粒之间的相互作用显示为增强或抑制发射。发射增强来自于等离子体共振放大的电场，而发射抑制来自于半导体向金属纳米粒子的能量转移。发射强度和能量传递速率在很大程度上取决于上层结构的几何参数以及纳米粒子的物理和材料性质。特别是在量子产率相对较小的纳米粒子上出现了发射增强效应，其中银纳米粒子比金纳米粒子有更强的增强效应。利用现实模型，我们回顾和分析了纳米颗粒之间能量传递的现有实验数据。在与聚合物连接的杂化超结构中，光发射对环境参数（例如温度）很敏感。这种灵敏度来自于连接器的膨胀或收缩。随着温度的升高，聚合物共轭配合物的发射随上层结构的不同而增加或减少。这里描述的结构具有传感器和致动器的潜力。
We describe the physical properties of excitons in hybrid complexes composed of semiconductor and metal nanoparticles. The interaction between individual nanoparticles is revealed as an enhancement or suppression of emission. Enhanced emission comes from electric field amplified by the plasmon resonance, whereas emission suppression is a result of energy transfer from semiconductor to metal nanoparticles. The emission intensity and energy transfer rate depend strongly on the geometrical parameters of the superstructure and the physical and material properties of the nanoparticles. In particular, the emission enhancement effect appears for nanoparticles with relatively small quantum yield, and silver nanoparticles have stronger enhancement compared to gold ones. Using realistic models, we review and analyze available experimental data on energy transfer between nanoparticles. In hybrid superstructures conjugated with polymer linkers, optical emission is sensitive to environmental parameters such as, for example, temperature. This sensitivity comes from expansion or contraction of a linker. With increasing temperature, emission of polymer-conjugated complexes can decrease or increase depending on the organization of a superstructure. The structures described here have potential as sensors and actuators.