SERS titration of 4-mercaptopyridine self-assembled monolayers at aqueous buffer/gold interfaces

被引：109

作者：

Yu, HZ ^{[1
]}

Xia, N ^{[1
]}

Liu, ZF ^{[1
]}

机构：

[1] Peking Univ, Coll Chem & Mol Engn, CIMR, Beijing 100871, Peoples R China

来源：

ANALYTICAL CHEMISTRY | 1999年 / 71卷 / 07期

关键词：

D O I：

10.1021/ac981131+

中图分类号：

O65 [分析化学];

学科分类号：

070302 ; 081704 ;

摘要：

Determination of the surface pK(a) of self-assembled monolayers (SAMs) at aqueous buffer/gold interfaces using surface-enhanced Raman scattering (SERS) measurements, namely, SERS titration, is reported for the first time. From the analysis of pa-dependent SERS spectra of 4-mercaptopyridine monolayers on gold, the pK(1/2) (3.9 +/- 0.2) was determined. By further correlating the surface pH value with die bulk pH value in terms of the Gouy-Chapmann model, the surface pK(a) (5.3 +/- 0.3) was evaluated accordingly. Compared to the conventional contact angle titration, SERS titration has the advantage of giving further insight into the microscopic and dynamic information of the surface-confined functional groups. In addition, such a technique has high sensitivity, micrometer spatial resolution, and chemical selectivity.

引用

页码：1354 / 1358

页数：5

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