...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Journal of Raman Spectroscopy: An International Journal for Original Work in All Aspects of Raman Spectroscopy, Including Higher Order Processes, and Also Brillouin- and Rayleigh Scattering >Direct visual evidence for chemical mechanisms of SERRS via charge transfer in Au-20-pyrazine-Au-20 junction
【24h】

Direct visual evidence for chemical mechanisms of SERRS via charge transfer in Au-20-pyrazine-Au-20 junction

机译：通过在Au-20-吡嗪-Au-20连接中的电荷转移获得SERRS化学机理的直接直观证据

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

The essence of the chemical mechanism for surface-enhanced resonance Raman scattering (SERRS) is the charge transfer (CT) between the metal and the molecule at the resonant electronic transition, which results in the mode-selective enhancement in the SERRS spectrum. The site-orientated CT can directly interpret the mode-selective chemical enhancement in SERRS. However, it is a great challenge to intutively visualize the orientation and site of the CT. In this paper, for the pyrazine-Au-2 complex, a three-dimensional [3D) cubic representation is built to provide direct visual evidence for chemical mechanisms of SERRS via CT from the Au-2 cluster to pyrazine at the resonant electronic transition. The relationship between the mode-selective enhancements in SERRS and the site-orientated CT was clearly revealed. The intracluster excitation (analog of plasmon excitation in large naonoparticles) was also visualized by the 3D cubic presentation, which provided the direct evidence of local electromagnetic field enhancement of SERRS. To study the quantum size effect and the coupling effect of the nanoparticles, the photoexcitation mechanisms of the Au-20 - pyrazine complex and the Au-20 - pyrazine - Au-20 junction were also investigated. The tunneling charge transfer from one Au-20 cluster to another Au-20 cluster outside the pyrazine in Au-20 - pyrazine - Au-20 junction was also revealed visually. The calculated normalized extinction spectra of Au nanoparticles using the generalized Mie theory reveal that the resonance peak is red-shifted due to the coupling between particles.
机译：表面增强共振拉曼散射（SERRS）的化学机理的实质是在共振电子跃迁处金属与分子之间的电荷转移（CT），这导致SERRS光谱中的模式选择性增强。定位CT可以直接解释SERRS中的模式选择性化学增强。但是，直观地可视化CT的方向和部位是一个巨大的挑战。在本文中，对于吡嗪-Au-2配合物，建立了三维[3D]立方表示，以提供直观的视觉证据，表明在共振电子跃迁中通过CT从Au-2团簇到吡嗪的SERRS化学机理。明确揭示了SERRS的模式选择性增强与定点CT之间的关系。簇内激发（大型纳米粒子中的等离激元激发的类似物）也可以通过3D立体显示来可视化，这提供了SERRS局部电磁场增强的直接证据。为了研究纳米粒子的量子尺寸效应和偶联效应，还研究了Au-20-吡嗪配合物和Au-20-吡嗪-Au-20结的光激发机理。还在视觉上揭示了在Au-20-吡嗪-Au-20结中从一个Au-20簇到另一个在吡嗪之外的Au-20簇的隧道电荷转移。使用广义米氏理论计算的金纳米粒子的归一化消光光谱表明，共振峰由于粒子之间的耦合而红移。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号