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Silver-coated inverse opals formed from polystyrene spheres for surface-enhanced Raman scattering

Authors

  • Weiqiang Mu,

    Corresponding author
    1. Physics and Astronomy Department, Northwestern University, Evanston, IL 60208, USA
    • Physics and Astronomy Department, Northwestern University, Evanston, IL 60208, USA.
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  • Dae-Kue Hwang,

    1. Materials Science and Engineering Department, Northwestern University, Evanston, IL 60208, USA
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  • Robert P. H. Chang,

    1. Materials Science and Engineering Department, Northwestern University, Evanston, IL 60208, USA
    2. Electrical Engineering and Computer Science Department, Northwestern University, Evanston, IL 60208, USA
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  • John B. Ketterson

    1. Physics and Astronomy Department, Northwestern University, Evanston, IL 60208, USA
    2. Electrical Engineering and Computer Science Department, Northwestern University, Evanston, IL 60208, USA
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Abstract

We have developed a new substrate for surface-enhanced Raman scattering (SERS) measurements involving a thin silver layer deposited over an ion-etched TiO2 inverse opal. The latter is formed by chemically infiltrating a polystyrene opal array with TiO2 followed by a thermal decomposition of the spheres. The SERS response of the these substrates is examined for several sphere sizes and lasers wavelengths; the results show that such substrates yield high enhance factors, comparable to substrates involving a silver layer deposited directly on a polystyrene opal array. Copyright © 2010 John Wiley & Sons, Ltd.

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