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                            Library & Multimedia
 Size and Wavelength Dependence of the Charge-Transfer Contributions to Surface-Enhanced Raman Spectroscopy in Ag/PATP/ZnO Junctions
NCJ Number
              304223
Journal

*Journal of Physical Chemistry C* Volume: 114 Issue: 3 Dated: 2010 Pages: 1610-1614
Author(s)
          Alexander P. Richter;
                        John R. Lombardi;
                        Bing Zhao
Date Published

2010
Length
              5 pages
Annotation
              The current project used surface-enhanced Raman spectroscopy to observe the degree of charge-transfer for Ag/PATP/ZnO sandwich compounds as a function of both ZnO nanoparticle size and as a function of excitation wavelength.
Abstract
              The project found that there are several likely charge-transfer resonances. The most obvious is the resonance at particle diameter of 27.7 nm for all wavelengths. In a theoretical study it has been suggested that when there is an electron acceptor on the nanoparticle surface, it may form a complex with the semiconductor exciton and that this is most likely the origin of the size-dependent resonance. At the smallest size (18.2 nm) studied here, there was an increase in degree of charge-transfer (relative to adjacent sizes), indicating the possibility of another, lower-lying charge-transfer state, which also could be caused by the acceptor−exciton complex. The other resonance suggested by project data is to higher excitation energy for all particle sizes. The degree of charge-transfer was observed rising as the excitation wavelength was shortened, indicating an additional charge-transfer resonance in the ultraviolet. (publisher abstract modified)
      
  
          Additional Details
Grant Number(s)
        2006-DN-BX-K034


  
  
        
  Agencies
        NIJ-Sponsored


  
  
        
  Award
        Development of Advanced Raman Spectroscopy Methods and Databases for the Evaluation of Trace Evidence and the Examination of Questioned Documents
    
  
  
Date Published: January 1, 2010
    
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