Blinking surface-enhanced Raman scattering and fluorescence from a single silver nanoaggregate simultaneously analyzed by bi-color intensity ratios and a truncated power law
Blinking surface-enhanced Raman scattering and fluorescence from a single silver nanoaggregate simultaneously analyzed by bi-color intensity ratios and a truncated power law
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通过双色强度比和截断幂律同时分析单个银纳米聚集体的闪烁表面增强拉曼散射和荧光
DOI：
10.1021/acs.jpcc.8b06920
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发表时间：
2018
期刊：
影响因子：
3.7
通讯作者：
Yukihiro Ozaki
中科院分区：
文献类型：
--
作者：
Yasutaka Kitahama;Yumi Nishiyama;Yukihiro Ozaki
表面增强拉曼散射（SERS）和表面增强荧光（SEF）分别发生在贵金属表面及其附近。为了研究贵金属表面和表面附近的分子行为，在不同波长区域同时观察了单个银纳米聚集体的闪烁SERS和SEF。聚赖氨酸的SERS在银纳米聚集体的交界处没有被观察到，而SEF是由银簇发出的。这种行为表明是单分子检测。从双色强度比和幂律分析两方面比较了稳定吸附染料分子的SERS和SEF的闪烁统计。虽然稳定吸附染料的双色强度比波动大于不稳定吸附染料，但吸附染料即使在聚集体表面附近也能发出荧光。与SEF相比，SERS的幂律在较短的尾部被截断。这可能是由于非发射态和发射态之间的能量势垒不同。
Surface-enhanced Raman scattering (SERS) and surface-enhanced fluorescence (SEF) occur on and near a noble metal surface, respectively. To investigate the molecular behavior on and near the surface of a noble metal, blinking SERS and SEF were simultaneously observed in different wavelength regions for a single Ag nanoaggregate. SERS of poly-l-lysine was not observed at the junction of the Ag nanoaggregate, whereas SEF was emitted by a Ag cluster. This behavior suggests single-molecule detection. The blinking statistics of SERS and SEF of stable adsorptive dye molecules were compared with those of unstable ones in terms of bi-color intensity ratios and a power law analysis. Although the fluctuation in the bi-color intensity ratio of the stable adsorbed dye was larger than that of the unstable one, the adsorbed dye can fluoresce even near the surface of the aggregate. The power law for SERS is truncated at the shorter tail compared to that for SEF. This may be due to a difference in the energy barrier between the nonemissive and emissive states.