Plasmon-assisted chemical reactions revealed by high-vacuum tip-enhanced Raman spectroscopy

Shuaicheng Lu; Shaoxiang Sheng; Zhenglong Zhang; Hongxing Xu; Hairong Zheng

doi:10.1117/12.2062134

28 August 2014 Plasmon-assisted chemical reactions revealed by high-vacuum tip-enhanced Raman spectroscopy

Shuaicheng Lu, Shaoxiang Sheng, Zhenglong Zhang, Hongxing Xu, Hairong Zheng

Proceedings Volume 9169, Nanoimaging and Nanospectroscopy II; 91690F (2014) https://doi.org/10.1117/12.2062134
Event: SPIE NanoScience + Engineering, 2014, San Diego, California, United States

Abstract

Tip-enhanced Raman spectroscopy (TERS) is the technique that combines the nanoscale spatial resolution of a scanning probe microscope and the highly sensitive Raman spectroscopy enhanced by the surface plasmons. It is suitable for chemical analysis at nanometer scale. Recently, TERS exhibited powerful potential in analyzing the chemical reactions at nanoscale. The high sensitivity and spatial resolution of TERS enable us to learn the reaction processes more clearly. More importantly, the chemical reaction in TERS is assisted by surface plasmons, which provides us an optical method to manipulate the chemical reactions at nanoscale. Here using our home-built high-vacuum tip-enhanced Raman spectroscopy (HV-TERS) setup, we successfully observed the plasmon-assisted molecule dimerization and dissociation reactions. In HV-TERS system, under laser illumination, 4-nitrobenzenethiol (4NBT) molecules can be dimerized to p,p’-dimercaptoazobenzene (DMAB), and dissociation reaction occurs for malachite green (MG) molecules. Using our HV-TERS setup, the dynamic processes of the reactions are clearly revealed. The chemical reactions can be manipulated by controlling the plasmon intensity through changing the power of the incident laser, the tunneling current and the bias voltage. We also investigated the role of plasmonic thermal effect in the reactions by measuring both the Stokes and anti- Stokes Raman peaks. Our findings extend the applications of TERS, which can help to study the chemical reactions and understand the dynamic processes at single molecular level, and even design molecules by the plasmon-assisted chemical reactions.

Citation Download Citation

Shuaicheng Lu, Shaoxiang Sheng, Zhenglong Zhang, Hongxing Xu, and Hairong Zheng "Plasmon-assisted chemical reactions revealed by high-vacuum tip-enhanced Raman spectroscopy", Proc. SPIE 9169, Nanoimaging and Nanospectroscopy II, 91690F (28 August 2014); https://doi.org/10.1117/12.2062134

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KEYWORDS

Raman spectroscopy

Chemical reactions

Molecules

Scanning tunneling microscopy

Chemical analysis

Gold

Magnesium

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