等离子体子
激发态
表面等离子共振
罗丹明6G
材料科学
银纳米粒子
光化学
分子
拉曼散射
表面等离子体子
化学物理
共振(粒子物理)
光电子学
纳米技术
纳米颗粒
拉曼光谱
物理
原子物理学
化学
光学
有机化学
作者
Andrei Ştefancu,Oana Maria Biro,Otto Todor-Boer,Ioan Botiz,Emiliano Cortés,Nicolae Leopold
出处
期刊:ACS Photonics
[American Chemical Society]
日期:2022-02-10
卷期号:9 (3): 895-904
被引量:7
标识
DOI:10.1021/acsphotonics.1c01714
摘要
We show that by modifying the chemical interface of silver nanoparticles (AgNPs) with halide ions, it is possible to tune the total decay rate of adsorbed excited molecules and the plasmon damping rate. Through single-molecule surface-enhanced Raman scattering and surface-enhanced fluorescence enhancement factors of crystal violet (CV) and rhodamine 6G (R6G), we show that I–-modified AgNPs (AgNPs@I) and Br–-modified AgNPs (AgNPs@Br) lead to an increase in the total decay rate of excited CV and R6G by a factor between ∼1.6–2.6, compared to Cl–-modified AgNPs (AgNPs@Cl). In addition, we found that the chemical interface damping, which characterizes the plasmon resonance decay into surface states, is stronger on AgNPs@I and AgNPs@Br when compared to AgNPs@Cl. These results point toward the formation of metal–halide surface complexes. These new interfacial states can accept electrons from both excited molecular orbitals and surface plasmon excitations, completely altering the electronic dynamics and reactivity of plasmonic interfaces.
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