Surface-enhanced Raman scattering (SERS)-based volatile organic compounds (VOCs) detection using plasmonic bimetallic nanogap substrate

Chi Lok Wong, U. S. Dinish, Kavitha Devi Buddharaju, Michael Stenbæk Schmidt, Malini Olivo

    Research output: Contribution to journalJournal articleResearchpeer-review

    Abstract

    In this paper, we present surface-enhanced Raman scattering (SERS)-based volatile organic compounds (VOCs) detection with bimetallic nanogap structure substrate. Deep UV photolithography at the wavelength of 250 nm is used to pattern circular shape nanostructures. The nanogap between adjacent circular patterns is 30 +/- 5 nm. Silver (30 nm) and gold (15 nm) plasmonic active layers are deposited on the nanostructures subsequently. SERS measurements on different concentrations of acetone vapor ranged from 0.7, 1.5, 3.5, 10.3, 24.5 % and control have been performed with the substrate. The measurement results are found reproducible, and the detection limit is found to be 9.5 pg (acetone molecule). The detection sensitivity is 28.7 % higher than that of the recent reported leaning silicon nanopillar substrate. With further system miniaturization, the sensing technique can work as a portable SERS-based VOCs detection platform for point-of-care breath analysis, homeland security, chemical sensing and environmental monitoring.
    Original languageEnglish
    JournalApplied Physics A: Materials Science & Processing
    Volume117
    Issue number2
    Pages (from-to)687-692
    Number of pages6
    ISSN0947-8396
    DOIs
    Publication statusPublished - 2014

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