等离激元共振能量转移与增强光催化研究进展

Plasmon resonance energy transfer and research progress in plasmon-enhanced photocatalysis

等离激元共振能量转移指表面等离激元将俘获的能量通过偶极-偶极相互作用转移到邻近的半导体或分子等激子体系中,它是等离激元非辐射弛豫的一个通道,也可作为获取和利用等离激元共振能量的一种方式.此外,等离激元能量还可以通过热电子弛豫(非辐射)和光散射(辐射)等方式耗散.等离激元各个弛豫通道之间存在着很强的关联,相关的能量转移和电荷转移过程可以将等离激元耗散的能量输送到其他体系或转换为其他能量形式.本文主要介绍了等离激元共振能量转移和与其相关的能量和电荷转移过程(包括等离激元近场增强及耦合、远场散射、热电子弛豫等)的物理机制和动力学性质,并详细介绍了这些机制在增强光催化研究领域的最新进展.

Plasmon resonance energy transfer refers to the coherent energy transfer via dipole-dipole coupling fromsurface plasmons to adjacent exciton nanosystems such as semiconductor quantum dots or dye molecules.Theplasmon resonance energy transfer is a non-radiative plasmon decay pathway,which can also act as an availablechannel to extract the plasmon-harvested energy.In addition,hot electron relaxation(non-radiative channel)and scattering(radiative channel)are also the dissipation pathways of surface plasmon resonances.Theplasmon-harvested energy can be effectively transferred to other nanosystems or converted into other energyforms through these correlated dissipation pathways.In this paper,the underlying mechanism and dynamics ofthe plasmon resonance energy transfer as well as the related energy and charge transfer processes(such as nearfield enhancement and coupling,far field scattering,plasmon-induced hot electron transfer)are introduced.Therecent research progress of the plasmon-enhanced photocatalysis by energy and charge transfer is reviewed.