The molecular orientation of PNBA on silver nanoparticles

The molecular orientations of p-nitrobenzoic acid (PNBA) on the surface of silver nanoparticles and silver mirror have been investigated by using surf ace enhanced Raman scattering (SERS) and UV-visible absorption spectroscopy . In the mixed system of silver colloid/PNBA/ethanol, the orientation of PN BA on silver nanoparticles remarkably different from that on silver mirror was observed, and it mainly resulted from the cooperation effect of the ads orption to surface active sites on silver under the pressure of aqueous mol ecules. This result is of some significance for further studying surface-in terfacial structures and properties of silver nanoparticles, and the techni que used in this note is feasible to get the SERS spectra of some molecules insoluble in aqueous solution.