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首页> 外文期刊>The journal of physical chemistry, C. Nanomaterials and interfaces >Face-Dependent Shell-Isolated Nanoparticle Enhanced Raman Spectroscopy of 2,2'-Bipyridlne on Au(100) and Au(111)
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Face-Dependent Shell-Isolated Nanoparticle Enhanced Raman Spectroscopy of 2,2'-Bipyridlne on Au(100) and Au(111)

机译：2,2'-联吡啶在Au（100）和Au（111）上的依赖于表面的壳隔离纳米增强拉曼光谱

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摘要

We have investigated the potential-dependent assembly of 2,2'-bipyridine molecules on both Au(100) and Au(111) surfaces using a newly developed Shell-Isolated Nanoparticle Enhanced-Raman Spectroscopy (SHINERS) technique. We present potential-dependent SHINERS spectra of 2,2'-bipyridine adsorbed on both surfaces collected under anodic as well as cathodic polarization. A series of processes were characterized by the analysis of the data set with Perturbation Correlation Moving Window Two-Dimensional Spectroscopy (PCMW2D) and Two-Dimensional Correlation Spectroscopy (2DCOS). Exquisite spectral detail was achieved and allowed for the characterization of the complicated ring breathing mode and C-C inter-ring stretching modes that are diagnostic of molecular orientation on the surfaces. Detection of several occluded vibration peaks was also made possible with SHINERS. Analysis reveals that in very negative potentials 2,2'-bipyridine adsorbs in a disordered, mixed state with both π-flat cis and several different vertically N-bound cis orientations, in contrast to previously published reports. Our findings provide insight into 2,2'-bipyridine adsorption on Au single crystals and also powerfully combine SHINERS with two-dimensional correlation analysis to yield a more detailed view of spectral transitions.
机译：我们已经使用新开发的壳隔离纳米粒子增强拉曼光谱（SHINERS）技术研究了Au（100）和Au（111）表面上2,2'-联吡啶分子的电位依赖组装。我们提出了在阳极和阴极极化下收集的两个表面上吸附的2,2'-联吡啶的电位依赖性SHINERS光谱。通过使用摄动相关移动窗口二维光谱（PCMW2D）和二维相关光谱（2DCOS）分析数据集来表征一系列过程。获得了精确的光谱细节，并可以表征复杂的环呼吸模式和C-C环间拉伸模式，这些模式可诊断表面上的分子取向。使用SHINERS还可以检测到几个被遮挡的振动峰。分析表明，与以前发表的报道相反，在极负电势下，2,2'-联吡啶以无序的混合状态吸附，同时具有π平面顺式和几个不同的垂直N结合顺式方向。我们的发现提供了对Au单晶上2,2'-联吡啶吸附的见解，并且还将SHINERS与二维相关性分析有效地结合在一起，以产生光谱跃迁的更详细视图。

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