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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。
The chemisorption kinetics of methylene blue at relatively dilute concentration was studied by means of SERS on nitric acid etched silver surface. The adsorption kinetics parameters were calculated for different vibration modes. The results showed that methylene blue adsorbed uniformly on the silver surface and there was no adsorption form Conversion between. At higher methylene blue concentrations, we observed markedly different behavior from the more dilute concentrations and suggested possible explanations. In addition, the influence of Cl- ions on the adsorption morphology of methylene blue on the silver surface was also investigated, and the transition from the “lying” mode to the “standing” mode was observed.