Uchiyama Kota, Kondo Takahiro, Saito Yuika
Department of Chemistry, Gakushuin University, 1-5-1 Mejiro, Toshima, Tokyo 171-8588, Japan.
ACS Omega. 2024 Oct 10;9(42):42950-42956. doi: 10.1021/acsomega.4c05817. eCollection 2024 Oct 22.
We analyzed the fluctuation of surface-enhanced Raman spectra with a temporal resolution of 25 ms using a conventional electron-multiplying charge-coupled device camera experimental setup. The signal-to-noise ratio of the spectra was improved using density-based spatial cluster analysis with noise. Silver nanoparticles (AgNPs) with different sizes were dispersed as surface-enhanced Raman spectroscopy platforms in violet aqueous solutions. The movement of AgNPs and the fluctuation of the spectra were characterized. The fluctuation (signal ON and OFF) was evaluated on the basis of the time intervals between ON and OFF timing. The behavior of each AgNP solution was explained by a two-dimensional random walk model, which means that the phenomenon was mainly governed by the Brownian motion of the AgNPs in the solution. The fluctuation was also compared among three different Raman modes, one of which showed anomalous behavior.
我们使用传统的电子倍增电荷耦合器件相机实验装置，以25毫秒的时间分辨率分析了表面增强拉曼光谱的波动情况。通过基于密度的带噪声空间聚类分析提高了光谱的信噪比。不同尺寸的银纳米颗粒（AgNPs）作为表面增强拉曼光谱平台分散在紫色水溶液中。对AgNPs的运动和光谱波动进行了表征。根据开启和关闭时刻之间的时间间隔评估波动（信号开启和关闭）。每个AgNP溶液的行为用二维随机游走模型进行解释，这意味着该现象主要由溶液中AgNPs的布朗运动主导。还比较了三种不同拉曼模式之间的波动情况，其中一种表现出异常行为。
