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Updated: May 7, 2026

Plasmonic Trapping and Release of Nanoparticles in a Monitoring Environment
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Plasmonic scissors for molecular design.

Mengtao Sun1, Zhenglong Zhang, Zee Hwan Kim

  • 1Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, P. O. Box 603-146, Beijing, 100190 (P. R. China). mtsun@iphy.ac.cn.

Chemistry (Weinheim an Der Bergstrasse, Germany)
|September 17, 2013
PubMed
Summary

Researchers used high-vacuum tip-enhanced Raman spectroscopy (HV-TERS) to control chemical reactions with plasmonic scissors. This method selectively breaks N=N bonds and controls reaction products by adjusting pH, offering new catalytic possibilities.

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Area of Science:

  • Surface chemistry
  • Catalysis
  • Nanotechnology

Background:

  • Heterogeneous catalysts are crucial for surface reactions, but controlling bond breaking and product selectivity remains challenging.
  • High-vacuum tip-enhanced Raman spectroscopy (HV-TERS) offers potential for studying surface catalytic reactions at the nanoscale.

Purpose of the Study:

  • To develop a novel method for controlling catalytic bond dissociation and reaction products using plasmon-generated hot electrons.
  • To demonstrate selective N=N bond cleavage and pH-dependent product formation in surface catalytic reactions.

Main Methods:

  • Utilized high-vacuum tip-enhanced Raman spectroscopy (HV-TERS) to probe surface catalytic reactions.
  • Generated hot electrons from plasmon decay to act as 'plasmonic scissors' for selective bond dissociation.
Keywords:
Raman spectroscopychemoselectivityplasmon chemistryradical reactionssurface chemistry

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  • Controlled reaction pathways by adjusting the pH of the environment.

    • Main Results:

    • Successfully achieved selective dissociation of the N=N bond in 4,4'-dimercaptoazobenzene using plasmonic scissors.
    • Demonstrated pH-dependent control over the reaction products derived from the SC6H5N radical fragment.
    • Identified p-aminothiophenol formation under acidic conditions and 4-nitrobenzenethiol under alkaline conditions.

    Conclusions:

    • Developed a novel HV-TERS-based method employing plasmonic scissors for controlled catalytic bond breaking.
    • Showcased the ability to precisely control surface reaction products by manipulating pH, offering a new strategy in catalysis.
    • Highlighted the potential of hot electron-driven chemistry for selective bond activation and product synthesis.