...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>ACS applied materials & interfaces >Kinetic and Mechanistic Investigation of the Photocatalyzed Surface Reduction of 4-Nitrothiophenol Observed on a Silver Plasmonic Film via Surface-Enhanced Raman Scattering
【24h】

Kinetic and Mechanistic Investigation of the Photocatalyzed Surface Reduction of 4-Nitrothiophenol Observed on a Silver Plasmonic Film via Surface-Enhanced Raman Scattering

机译：通过表面增强拉曼散射在银浆膜上观察到4-硝基酚苯酚的光催化表面减少的动力学和机械研究

获取原文
获取原文并翻译 | 示例
   

获取外文期刊封面封底 >>

       
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Hot electrons generated by photoinduced plasmon decay from a plasmonic metal surface can reduce 4-nitrothiophenol (4-NTP) to 4-aminothiophenol (4-ATP). Compared to the reduction with a reducing agent such as sodium borohydride, surface-enhanced Raman scattering (SERS) measurements were performed here to elucidate the complex molecular mechanism of the reduction in the presence of halide ions and hydrogen ions. The SERS measurements were performed using a simply prepared silver plasmonic film (AgPF), which enables monitoring of the reaction under different conditions at a solid-liquid surface and eliminates the need for the use of a reducing agent. As the concentration of H+ and Cl- could be controlled, the observation of the reaction under a systematic set of conditions was possible. Based on the kinetic traces of the intermediates, a reaction mechanism for the 4-NTP to 4-ATP reduction is suggested. Rate constants for the individual reactions are presented that fit the measured kinetic traces, and the role of hydrogen in each reaction step is characterized. This work provides clarification on the molecular transformation directly using protons as the hydrogen source and demonstrates an effective method of applying a simple and low-cost silver surface catalyst for SERS studies. Moreover, the monitoring of Cr-concentration-dependent spectra provides insight into the hot-electron conversion process during the photoreduction and strongly supports the formation of AgCl for the activation of H+.
机译：通过光抑制的等离子体表面产生的热电子从等离子体金属表面产生，可以减少4-硝基酚（4-NTP）至4-氨基噻吩醇（4-ATP）。与硼氢化钠等还原剂的还原相比，这里进行表面增强的拉曼散射（SERs）测量，以阐明卤离子和氢离子存在下还原的复杂分子机制。使用简单制备的银浆膜（AGPF）进行SERS测量，这使得能够在固液表面的不同条件下监测反应，并消除了使用还原剂的需要。作为可以控制H +和Cl-的浓度，可以在系统的条件下观察反应。基于中间体的动力学痕迹，提出了4-NTP至4-ATP减少的反应机理。提出了个体反应的速率常数，其适合测量的动力学迹线，并且表征在每个反应步骤中的氢在每个反应步骤中的作用。该作品澄清直接使用质子作为氢气来源的分子转化，并证明了应用简单和低成本的银色表面催化剂的有效方法进行SERS研究。此外，对Cr浓度依赖性光谱的监测提供了在光电期间对热电子转换过程的洞察力，并且强烈支持AgCl的形成以使H +的活化。

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