Inhibition of electrochemical reactions at gold surfaces by grafted, highly fluorinated, hyperbranched polymer films

被引：62

作者：

Zhao, MQ ^{[1
]}

Zhou, YF ^{[1
]}

Bruening, ML ^{[1
]}

Bergbreiter, DE ^{[1
]}

Crooks, RM ^{[1
]}

机构：

[1] TEXAS A&M UNIV,DEPT CHEM,COLLEGE STN,TX 77843

来源：

LANGMUIR | 1997年 / 13卷 / 06期

关键词：

D O I：

10.1021/la961016z

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

We report the synthesis and passivation properties of surface-grafted, highly fluorinated, hyperbranched poly(acrylic acid) (PAA) films that contain up to 50 atom % F. These films are very hydrophobic (water contact angle of up to 114 degrees) and block electrochemical reactions on gold electrodes. Cyclic voltammetry in basic solution shows that while an electrode covered with a three-layer PAA (3-PAA) film mimics an assembly of microelectrodes, a fluorinated three-layer PAA (3-PAA/F) film blocks nearly all electron transfer to the gold surface. The charge transfer resistance of electrodes covered with a 5-PAA/F film is about 40 times greater than that for an electrode covered with a nonfluorinated 3-PAA film. 3-PAA/F films are initially 10 times more blocking than C16SH SAMs. Additionally, while the SAM is desorbed by electrochemical cycling, 3-PAA/F films are still highly blocking after ten potential sweeps over a 1.5 V range. Thus fluorinated PAA films are promising candidates for corrosion-inhibiting coatings.

引用

页码：1388 / 1391

页数：4

共 27 条

[1] CHARGE-TRANSFER AT PARTIALLY BLOCKED SURFACES - A MODEL FOR THE CASE OF MICROSCOPIC ACTIVE AND INACTIVE SITES [J].