Electrode potential effect on the surface pKa of a self-assembled 15-mercaptohexadecanoic acid monolayer on a gold/quartz crystal microbalance electrode

被引：88

作者：

Sugihara, K

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：

LANGMUIR | 2000年 / 16卷 / 18期

关键词：

D O I：

10.1021/la991301t

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

Surface mass titrations of a self-assembled monolayer (SAM) of 15-mercaptohexadecanoic acid on a gold/quartz crystal microbalance electrode have been performed at various electrode potentials. The apparent pK(a) of the monolayer, obtained from the pH value at half the total frequency change, shifted in a negative direction from 6.4 at -200 mV to 4.3 at -700 mV vs Ag/AgCl. When potentials more positive than 600 mV were applied, the pK(a) has a tendency to shift in the positive direction. These results demonstrate that the surface acid/base properties of the SAMs can be controlled by the electrode potential.

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收藏

页码：7101 / 7105

页数：5

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