高等学校化学学报

高等学校化学学报 ›› 1995, Vol. 16 ›› Issue (2): 245.

• 论文 • 上一篇    下一篇

水在Ag电极上取向与结构的SERS研究──不同电极电位和NaClO4浓度的影响

邹受忠, 张韫宏, 陈燕霞, 田中群   

  1. 厦门大学固体表面物理化学国家重点实验室, 化学系, 厦门 361005
  • 收稿日期:1994-06-04 修回日期:1994-11-16 出版日期:1995-02-24 发布日期:1995-02-24
  • 通讯作者: 田中群
  • 作者简介:邹受忠,男,24岁,硕士研究生.
  • 基金资助:

    国家教育委员会优秀年轻教师基金;国家自然科学基金

SERS Studies on the Orientation and Structure of Absorbed Water at Ag Electrodes──Effects of Electrode Potential and NaClO4Concentrations

ZOU Shou-Zhong, ZHANG Yun-Hong, CHEN Yan-Xia, TIAN Zhong-Qun   

  1. State Key Laboratory for Physical Chemistry of Solid Surfaces, Department of Chemistry, Xiamen University, Xiamen, 361005
  • Received:1994-06-04 Revised:1994-11-16 Online:1995-02-24 Published:1995-02-24

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摘要： 将特殊的ORC方法、薄层溶液技术和差谱方法相结合,在较宽的电位区间(-0.7-2.0V),获得了不含任何(类)卤素离子的NaClO4/Ag体系中水的SERS谱.结果表明,不同浓度的NaClO4体系中,尽管体相水的结构有很大差别,但电极表面的吸附水有相似的结构特征,即由于电场作用而使有序性较高;并且随电极电位由极负电位向零电荷电位(PZC)变化时可能都经历着由单氢端吸附转变为双氢端吸附,继而又转向氧端吸附的取向变化过程.利用SERS技术特有的检测表面物种的高灵敏度,可观察到NaClO4浓度引起的表面水的SERS谱的一些细微差异,依此较详细讨论了NaClO4浓度对表面水的结构和取向变化过程的影响.

关键词: 表面增强Raman散射, H2O, NaClO4, 吸附, 取向

Abstract: Combining with the special procedure of roughing surface and the difference spectra technique,one can obtain the surface enhanced Raman scattering(SERS) spectra of water adsorbed on Ag electrodes in a wide potential range(-0.7--2.0V) from NaClO4solutions with various concentrations(0.1-8.0 mol/L).It has been shown that the absorbed water has much higher ordered structure than that in the bulk solutions.The concentration of NaClO4has much less effect on water molecules adsorbed on the surface,especially in the relatively negative potential region,in comparison with that in the bulk solutions.With changing the potential form-2.0 Vto-0.9 V,the adsorbed water is reoriented from one hydrogen ending to the surface to two hydrogens then to the oxygen ending.The concentration effect of ClO4-ions on the reorientation of the absorbed water is discussed in detail.

Key words: Surface Enhanced Raman Scattering(SERS), H2O,NaClO4, Adsorption, Orientation

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