Abstract
Surface enhanced Raman scattering (SERS) of halate ions in silver colloids is studied by near infrared (NIR) laser excitation.Ions of ClO-3 and BrO-3 in silver colloids give rise to SERS bands at about 226 and 158cm-1,respectively while IO-3 ions on colloidal silver surface result in two Raman bands at about 750 and 334cm-1.These results indicate that the interactions of ClO-3 and BrO-3 ions with silver surface are through their lone pair electrons of Cl and Br.Nevertherless,IO-3 ions bond to silver surface through their negatively charged O-.The interaction strength of halate ions with silver are measured to be BrO-3>ClO-3≈IO-3.The enhancements of the Raman modes of pyridine caused by addition of halate ions increase in the order ClO-3-3-3.The enhancement mechanisms in NIR SERS are discussed.
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