Structure dependence of the surface pKa of mercaptoundecanoic acid SAM on gold

被引：34

作者：

Sugihara, K

Teranishi, T

Shimazu, K ^{[1
]}

Uosaki, K

机构：

[1] Hokkaido Univ, Grad Sch Environm Earth Sci, Div Mat Sci, Sapporo, Hokkaido 0600810, Japan

[2] Hokkaido Univ, Grad Sch Sci, Div Chem, Sapporo, Hokkaido 0600810, Japan

来源：

ELECTROCHEMISTRY | 1999年 / 67卷 / 12期

关键词：

surface pKa; SAM; mercaptoundecanoic acid; surface mass titration;

D O I：

10.5796/electrochemistry.67.1172

中图分类号：

O646 [电化学、电解、磁化学];

学科分类号：

081704 ;

摘要：

The surface pKa of mercaptoundecanoic acid (MUA) in its self-assembled monolayer (SAM) and in mixed monolayers with alkanethiol has been examined using the surface mass titration method based on a quartz crystal microbalance. The pKa value, determined from the pH at half the total mass change, shifted in a positive direction with the increase in the surface coverage of MUA in both monolayers, showing the repulsive interaction between carboxylates. The pKa at zero coverage depends on the monolayer structure; 4.8 for the SAM and 5.6 for the mixed monolayer.

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收藏

页码：1172 / 1174

页数：3

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