In-situ plasmon-driven chemical reactions revealed by high vacuum tip-enhanced Raman spectroscopy.

IF 3.9 2区综合性期刊 Q1 MULTIDISCIPLINARY SCIENCES Scientific Reports Pub Date : 2012-01-01 Epub Date: 2012-09-11 DOI:10.1038/srep00647

Mengtao Sun, Zhenglong Zhang, Hairong Zheng, Hongxing Xu

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引用次数: 254

Abstract

With strong surface plasmons excited at the metallic tip, tip-enhanced Raman spectroscopy (TERS) has both high spectroscopic sensitivity and high spatial resolution, and is becoming an essential tool for chemical analysis. It is a great challenge to combine TERS with a high vacuum system due to the poor optical collection efficiency. We used our innovatively designed home-built high vacuum TERS (HV-TERS) to investigate the plasmon-driven in-situ chemical reaction of 4-nitrobenzenethiol dimerizing to dimercaptoazobenzene. The chemical reactions can be controlled by the plasmon intensity, which in turn can be controlled by the incident laser intensity, tunneling current and bias voltage. The temperature of such a chemical reaction can also be obtained by the clearly observed Stokes and Anti-Stokes HV-TERS peaks. Our findings offer a new way to design a highly efficient HV-TERS system and its applications to chemical catalysis and synthesis of molecules, and significantly extend the studies of chemical reactions.

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高真空尖端增强拉曼光谱揭示原位等离子体驱动化学反应。

尖端增强拉曼光谱(TERS)由于在金属尖端激发了强表面等离子体，具有高光谱灵敏度和高空间分辨率，正成为化学分析的重要工具。由于光采集效率不高，将其与高真空系统相结合是一个很大的挑战。利用自主设计的高真空紫外分光光度仪(HV-TERS)，研究了4-硝基苯硫醇二聚生成二巯基偶氮苯的等离子体驱动原位化学反应。化学反应可由等离子体强度控制，而等离子体强度又可由入射激光强度、隧穿电流和偏置电压控制。这种化学反应的温度也可以通过清晰观察到的Stokes和Anti-Stokes HV-TERS峰得到。本研究结果为设计高效的HV-TERS系统及其在化学催化和分子合成中的应用提供了新的途径，并极大地扩展了化学反应的研究。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Scientific Reports Natural Science Disciplines-

CiteScore

7.50

自引率

4.30%

发文量

19567

审稿时长

3.9 months

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