Accession Number:

ADA318121

Title:

Inhibition of Electrochemical Reactions at Gold Surfaces by Grafted, Highly Fluorinated, Hyperbranched Polymer Films

Descriptive Note:

Technical rept. 1 Jun-31 Jul 96,

Corporate Author:

TEXAS A AND M UNIV COLLEGE STATION DEPT OF CHEMISTRY

Report Date:

1996-10-01

Pagination or Media Count:

21.0

Abstract:

We report the synthesis and passivation properties of surface-grafted, highly fluorinated, hyperbranched polyacrylic acid PAA films that contain 50 atom F These films are very hydrophobic water contact angle of 114 deg and block electrochemical reactions on gold electrodes. Cyclic voltammetry in basic solution shows that while an electrode covered with a 3-layer PAA 3-PAA film mimics an assembly of microelectrodes, a fluorinated 3-layer PAA 3-PAAF film blocks nearly all electron transfer to the gold surface. The charge transfer resistance of electrodes covered with a 3-PAAF film is about 40 times greater than that for an electrode covered with a nonfluorinated 3-PAA film. 3-PAAF films are initially 10 times more blocking than C16SH SAMs. Additionally, while the SAM is desorbed by electrochemical cycling, 3-PAAF 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.

Subject Categories:

  • Inorganic Chemistry
  • Physical Chemistry
  • Polymer Chemistry
  • Electricity and Magnetism

Distribution Statement:

APPROVED FOR PUBLIC RELEASE