摘要
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 HNO3etched silver surfaceThe adsorption kinetic paramters were deduced from different vibrational modes at a rether low concentration,and it showed that MB adsorbed homogeneously on silver surfaceHowever,the adsorptive behavior turned anomalous at relatively high concentration and a possible explanation was suggestedIn addition,the influence of Cl ions to the adsorption states of MB was also investigatedAfter adding Cl ions,a transformation from the “lyingdown”state to the“endon”state was observed
基金
国家自然科学基金
关键词
亚甲基蓝
银
吸附动力学
SERS
硝酸刻蚀银表面
Methylene Blue Silver Chemisorption kinetic Adsorption state SurfaceEnhanced Raman Scattering(SERS)