Wide-Band Spectral Control of Au Nanoparticle Plasmon Resonances on a Thermally and Chemically Robust Sensing Platform

    Authors

    C. Lumdee; B. F. Yun;P. G. Kik

    Comments

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    Abbreviated Journal Title

    J. Phys. Chem. C

    Keywords

    ENHANCED RAMAN-SCATTERING; GOLD NANOPARTICLE; OPTICAL-RESPONSE; FILM; SPECTROSCOPY; NANOSTRUCTURES; FLUORESCENCE; LITHOGRAPHY; SUBSTRATE; SURFACES; Chemistry, Physical; Nanoscience & Nanotechnology; Materials Science, ; Multidisciplinary

    Abstract

    Gold nanoparticles on Al2O3-coated gold films are presented as a chemically and thermally robust platform for molecular sensing. Single particle spectroscopy as a function of Al2O3 coating thickness shows reproducible gold nanoparticle scattering spectra in the range from 690 to 610 nm as the Al2O3 thickness increases from 0 to 3.4 nm. Numerical simulation of these structures indicates that surface-enhanced Raman spectroscopy enhancement factors in excess of 106 can be achieved. The stability of the Al2O3-coated structures under high-power laser irradiation was tested, revealing stable scattering spectra upon irradiation with 100 W/mm(2) at the particle resonance wavelength. The presented structure solves challenges with thermal stability, wavelength tuning range, and Raman background signal associated with previously attempted approaches.

    Journal Title

    Journal of Physical Chemistry C

    Volume

    117

    Issue/Number

    37

    Publication Date

    1-1-2013

    Document Type

    Article

    Language

    English

    First Page

    19127

    Last Page

    19133

    WOS Identifier

    WOS:000330162600040

    ISSN

    1932-7447

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