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Photo-induced enhanced Raman spectroscopy for universal ultra-trace detection of explosives, pollutants and biomolecules

Author

Listed:
  • Sultan Ben-Jaber

    (University College London)

  • William J. Peveler

    (University College London)

  • Raul Quesada-Cabrera

    (University College London)

  • Emiliano Cortés

    (The Blackett Laboratory, Imperial College)

  • Carlos Sotelo-Vazquez

    (University College London)

  • Nadia Abdul-Karim

    (University College London)

  • Stefan A. Maier

    (The Blackett Laboratory, Imperial College)

  • Ivan P. Parkin

    (University College London)

Abstract

Surface-enhanced Raman spectroscopy is one of the most sensitive spectroscopic techniques available, with single-molecule detection possible on a range of noble-metal substrates. It is widely used to detect molecules that have a strong Raman response at very low concentrations. Here we present photo-induced-enhanced Raman spectroscopy, where the combination of plasmonic nanoparticles with a photo-activated substrate gives rise to large signal enhancement (an order of magnitude) for a wide range of small molecules, even those with a typically low Raman cross-section. We show that the induced chemical enhancement is due to increased electron density at the noble-metal nanoparticles, and demonstrate the universality of this system with explosives, biomolecules and organic dyes, at trace levels. Our substrates are also easy to fabricate, self-cleaning and reusable.

Suggested Citation

  • Sultan Ben-Jaber & William J. Peveler & Raul Quesada-Cabrera & Emiliano Cortés & Carlos Sotelo-Vazquez & Nadia Abdul-Karim & Stefan A. Maier & Ivan P. Parkin, 2016. "Photo-induced enhanced Raman spectroscopy for universal ultra-trace detection of explosives, pollutants and biomolecules," Nature Communications, Nature, vol. 7(1), pages 1-6, November.
    • Handle: RePEc:nat:natcom:v:7:y:2016:i:1:d:10.1038_ncomms12189
    DOI: 10.1038/ncomms12189
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