亚甲基蓝化学吸附动力学的SERS研究

SERS Study on the Chemisorption Kinetics of Methylene Blue

用硝酸刻蚀银表面ＳＥＲＳ技术研究了亚甲基蓝在较稀浓度时的化学吸附动力学，对不同振动模式计算了吸附动力学参数，结果表明，亚甲基蓝在银表面上吸附均匀，吸附过程中没有吸附形态间的转化。在亚甲基蓝浓度较高时，我们观察到了与浓度较稀时明显不同的行为，并提出了可能的解释。另外，还考察了Ｃｌ－离子对亚甲基蓝在银表面上吸附形态的影响，观察到由“平躺”方式向“站立”方式的转变。

SERS technique was used to study the chemisorption kinetics of Methylene Blue(MB)on the HNO3etched silver surfaceThe adsorption kinetic paramters were deduced from different vibrational modes at a rether low concentration,and it showed that MB adsorbed homogeneously on silver surfaceHowever,the adsorptive behavior turned anomalous at relatively high concentration and a possible explanation was suggestedIn addition,the influence of Cl ions to the adsorption states of MB was also investigatedAfter adding Cl ions,a transformation from the “lyingdown”state to the“endon”state was observed