SERS STUDIES ON THE ORIENTATION AND STRUCTURE OF ABSORBED WATER AT AG ELECTRODES - EFFECTS OF ELECTRODE POTENTIAL AND NACLO4 CONCENTRATIONS
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Combining with the special procedure of roughing surface and the difference spectra technique, one can obtain the surface-enhanced Raman scattering (SERS) spectra of water adsorbed on Ag electrodes in a wide potential range (-0.7----2.0 V) from NaClO4 solutions with various concentrations (0.1-8.0 mol/L). It has been shown that the absorbed water has much higher ordered structure than that in the bulk solutions, The concentration of NaClO4, has much less effect on water molecules adsorbed on the surface, especially in the relatively negative potential region, in comparison with that in the bulk solutions. With changing the potential form -2.0 V to -0.9 V, the adsorbed water is reoriented from one hydrogen ending to the surface to two hydrogens then to the oxygen ending, The concentration effect of ClO4- ions on the reorientation of the absorbed water is discussed in detail.