Design Principles for Directing Energy and Energetic Charge Flow in Multicomponent Plasmonic Nanostructures
Design Principles for Directing Energy and Energetic Charge Flow in Multicomponent Plasmonic Nanostructures
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DOI：
10.1021/acsenergylett.8b00841
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发表时间：
2018-07-01
影响因子：
22
通讯作者：
Linic, Suljo
中科院分区：
文献类型：
--
作者：
Chavez, Steven;Aslam, Umar;Linic, Suljo
由等离子体金属纳米颗粒支持的局部表面等离子体的衰减导致在纳米颗粒内形成高能电荷载流子。一旦形成，这些电荷载体可以转移到化学附着的材料，在那里它们可以执行功能。这些电荷载流子在各种应用中的有效提取和利用取决于设计在纳米结构中的特定位置处具有高度局部化电荷载流子生成的等离子体纳米结构的能力。在这里，我们揭示了在共振激发的多金属等离子体纳米粒子的能量流的物理机制。我们证明了用非等离子体金属涂覆等离子体纳米结构可以导致能量的优先耗散（即，电荷载流子的形成），并且这种耗散的程度在很大程度上取决于组成金属的电子结构。我们使用各种核-壳纳米结构的实验和建模研究来开发这些系统中能量转移的透明物理框架，并讨论如何使用该框架来设计允许高效率电荷载流子提取的纳米结构。
The decay of localized surface plasmons supported by plasmonic metal nanoparticles results in the formation of energetic charge carriers within the nanoparticles. Once formed, these charge carriers can transfer to chemically attached materials where they can perform a function. The efficient extraction and utilization of these charge carriers in various applications hinges on the ability to design plasmonic nanostructures with highly localized charge carrier generation at specific locations in the nanostructure. Herein, we shed light on the physical mechanisms governing the flow of energy in resonantly excited multimetallic plasmonic nanoparticles. We demonstrate that coating plasmonic nanostructures with nonplasmonic metals can result in the preferential dissipation of energy (i.e., formation of charge carriers) in the nonplasmonic metal and that the extent of this dissipation depends heavily on the electronic structure of the constituent metals. We use experimental and modeling studies of various core-shell nanostructures to develop a transparent physical framework of energy transfer in these systems and discuss how this framework can be used to engineer nanostructures that allow for high efficiencies of charge carrier extraction.