Surface‐enhanced raman spectroscopy of acrylamide and polyacrylamide adsorbed on silver colloid surfaces: Polymerization of acrylamide on silver

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Abstract
The SERS spectra of acrylamide and polyacrylamide adsorbed on the surface of silver colloid particles are reported. The SERS spectrum of acrylamide is interpreted as indicating that polymerization takes place on silver colloid surfaces. Evidence supporting this conclusion includes the fact that the CH2 stretching vibrations of acrylamide adsorbed on the silver colloid surfaces are at 2926 and 2972 cm−1, which correspond exactly to those of polyacrylamide, and are greatly different from those at 3050 and 3115 cm−1 observed for acrylamide in aqueous solution. Another possible indication of polymerization is the band at 1164 cm−1, which can be assigned to a polymer skeletal vibration.Although acrylamide is polymerized on the silver colloid surfaces, the SERS spectra of polyacrylamide polymerized before adsorption and acrylamide polymerized on the colloid surface are very different from each other. This observation is attributed to the different surface geometry of these two polymers, and the possible contibution of non‐polymerized species in the SERS spectrum of acrylamide.

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