Surface-enhanced Raman spectroscopy of dodecanethiol-bound silver nanoparticles at the liquid/liquid interface.
Surface-enhanced Raman spectroscopy of dodecanethiol-bound silver nanoparticles at the liquid/liquid interface.
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DOI：
10.1021/la0603119
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发表时间：
2006-06
期刊：
影响因子：
--
通讯作者：
S. Yamamoto;H. Watarai
中科院分区：
文献类型：
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作者：
S. Yamamoto;H. Watarai
用全内反射(TIR)光散射显微镜和TIR表面增强拉曼散射(SERS)研究了十二硫醇(DT)结合的银纳米粒子(SNPs)在环己烷/水界面上的吸附和微区形成。通过TIR光散射显微镜观察了柠檬酸还原的SNP与环己烷中的DT反应生成的SNP的界面吸附和微区形成的程度。DT在SNP上的拉曼光谱表明，随着DT初始浓度的增加，Nu(C-S)带区的Guche构象和反式构象的相对强度比减小，表明DT由液体结构向固体结构转变。通过吸附的阳离子卟啉5，10，15，20-tetrakis(N-methylpyridinium-4-yl)-21H，23H-porphine(TMPyP)的共振表面增强拉曼光谱(SERS)峰检测到界面上SNPs上剩余的负电荷。界面SNPs结构域作为TMPyP的SERS衬底的效率强烈依赖于DT的吸附状态。
Adsorption and domain formation of dodecanethiol (DT)-bound silver nanoparticles (SNPs) at the cyclohexane/water interface were studied by means of total internal reflection (TIR) light scattering microscopy and TIR surface-enhanced Raman scattering (SERS). By the TIR light scattering microscopy, the extent of the interfacial adsorption and domain formation of SNP was observed, which was produced by the reaction between citrate-reduced SNPs in the aqueous phase and DT in the cyclohexane phase. The Raman spectra of DT on SNP showed that the relative intensity ratios of gauche to trans conformers in the nu(C-S) band region decreased with the increase of the initial concentration of DT, suggesting the change from the liquidlike structure to the solidlike structure of the DT. The residue of the negative charges on the SNPs at the interface was detected by the resonance SERS (SERRS) peaks of the adsorbed cationic porphyrin, 5,10,15,20-tetrakis(N-methylpyridinium-4-yl)-21H,23H-porphine (TMPyP). The efficiency of the interfacial SNPs domains as a SERS substrate for TMPyP strongly depended on the adsorption state of the DT.