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                            Library & Multimedia
 Two-Dimensional Array of Silica Particles as a SERS Substrate
NCJ Number
              304219
Journal

*Journal of Physical Chemistry C* Volume: 118 Issue: 17 Dated: 2014 Pages: 9114–9118
Author(s)
          Dane Christie;
                        John Lombardi;
                        Ilona Kretzschmar
Date Published

2014
Length
              5 pages
Annotation
              This article reports on a project that observed size-dependent surface-enhanced Raman spectra (SERS) for crystal violet (CV) adsorbed on a monolayer of hexagonally close-packed silica spheres.
Abstract
              Enhancement factors on the order of 104 were estimated based on the ratio of the number of CV molecules excited in solution to those on the surface of the monolayer array. The proposed enhancement mechanism was that of delocalized surface plasmon resonance over the monolayer array. Plasmon resonances of silica spheres were calculated using Mie theory for light scattering and experimentally validated with UV–vis absorption spectra. There was an excellent agreement between the observed spectrum from the monolayer arrays and a single particle calculated spectrum. This work points the way to used silica particles as a viable alternative to current SERS substrates, as well as illustrates the importance of surface plasmon resonances from photonic crystals in the SERS of semiconductors. (publisher abstract modified)
      
  
          Additional Details
Grant Number(s)
        2009-DN-BX-K185


  
  
        
  Agencies
        NIJ-Sponsored


  
  
        
  Award
        Development Of Advanced Raman Spectroscopy Methods And Databases For The Evaluation Of Trace Evidence And The Examination Of Questioned Documents-Phase II
    
  
  
Date Published: January 1, 2014
    
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