Study on the chemisorption kinetics of Methylene Blue using SERS technique

SERS technique wae used to study the chemiesorption kinetics of Methylene Blue (MB) on the HNO 3 ‐etched silver surface. The adsorption kinetic parameters were deduced from different vibrational modes at a low concentration of 3.5 × 10 −6 mol/L, and it showed that MB adsorbed uniformly (monolayerly) on silver surface. However, the adsorptive behavior turned anomalous at relatively higher concentrations and a possible explanation was suggested. In addition, the influence of Cl − ions on the adsorption states of MB was investigated, and it was shown that MB molecules, adsorbed on the silver surface, tended to transform the “lying‐down” state to the “end ‐ on” 4 state after CI − ions were added.