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Bulletin of the Korean Chemical Society (BKCS)

ISSN 0253-2964(Print)
ISSN 1229-5949(Online)
Volume 27, Number 4
BKCSDE 27(4)
April 20, 2006 

 
Title
Surface-enhanced Raman Spectroscopy of Ethephone Adsorbed on Silver Surface
Author
Chul Jae Lee, Hee Jin Kim, Mohammad Rezaul Karim, Mu Sang Lee*
Keywords
Surface-enhanced Raman spectroscopy, Pesticide, γ -Irradiation, Ethephone
Abstract
We investigated the Surface-enhanced Raman Spectroscopy (SERS) spectrum of ethephone (2- chloroethylphosphonic acid). We observed significant signals in the ordinary Raman spectrum for solid-state ethephone as well as when it was adsorbed on a colloidal silver surface, strong vibrational signals were obtained at a very low concentration. The SERS spectra were obtained by silver colloids that were prepared by the γ - irradiation method. The influence of pH and the influence of anion (Cl-, Br-, I-) on the adsorption orientation were investigated. Two different adsorption mechanisms were deduced, depending on the experimental conditions. The chlorine atom or the chlorine and two oxygen atoms were adsorbed on the colloidal silver surface. Among halide ions, Br- and I- were more strongly adsorbed on the colloidal silver surfaces. As a result, the adsorption of ethephone was less effective due to their steric hinderance.
Page
545 - 548
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