对氨基苯甲酸分子在银表面多相吸附及氯离子影响的SERS研究  

STUDY OF HETEROGENEOUS ADSORPTION ON SURFACES BY SERS

作　　者：傅石友[1] 王明吉[1] 刘业厚[1] 张鹏翔[2] 

机构地区：[1]大庆石油学院电子工程系,安达151400 [2]中国科学院物理研究所,北京100080

出　　处：《物理学报》1996年第5期769-773,共5页Acta Physica Sinica

摘　　要：研究对氨基苯甲酸(PABA)在银表面上的吸附动力学过程以及氯离子对其的影响,发现PABA在银表面上呈多相吸附。与匀相吸附的情况相似,表面形态的差异较大地改变吸附速率常数,而对多相因子的影响不明显。氯离子的竞争吸附改变PABA吸附的多相性质,随着氯离子浓度的增加,PABA分子从多相吸附逐渐转变为匀相吸附。根据吸附等温线估算了PABA的吸附能,U≈-9.6kJ/mol。结果分析进一步证实:化学吸附时多相吸附意味着表面上存在非单一的吸附形式。The adsorption kinetics of PABA molecules on silver surface and the influnce of chloride ions to it are discussed in detail. It is found that the adsorption of PABA on the silver surfaces is heterogeneous. The adsorption rate constant is affected by the difference of surface states greatly, but the heterogeneity parameter is in less degree. The adsorption heterogneity of PABA is changed by the competitive adsorption of chloride ions. PABA molecules with the of concentration of chloride ions. have turned homogeneous adsorption gradually from heterogeneous adsorption. The adsorption energy of PABA on silver surface is reckoned by the isotherms . It is further proved that the heteroge -neity of chemical adsorption means the adsorption state on the surface is not only one.

关 键 词：银 多晶吸附 氯离子 氨基苯甲酸分子 

分 类 号：O552.4[理学—热学与物质分子运动论]