TRANSPORT-PROPERTIES OF CATIONIC DYES IN NAFION FILMS - UNUSUALLY HIGH DIFFUSION-COEFFICIENTS AND AGGREGATION EFFECTS

被引：49

作者：

GUADALUPE, AR ^{[1
]}

LIU, KE ^{[1
]}

ABRUNA, HD ^{[1
]}

机构：

[1] CORNELL UNIV,BAKER LAB,DEPT CHEM,ITHACA,NY 14853

来源：

ELECTROCHIMICA ACTA | 1991年 / 36卷 / 5-6期

基金：

美国国家科学基金会;

关键词：

NAFION FILM; TRANSPORT; DIFFUSION COEFFICIENT; CATIONIC DYES;

D O I：

10.1016/0013-4686(91)85289-J

中图分类号：

O646 [电化学、电解、磁化学];

学科分类号：

081704 ;

摘要：

Studies on the transport properties of the cationic dyes methylene blue, thionine, safranine and meldola blue in Nafion-coated electrodes are reported. Diffusion coefficients for the reduced and oxidized forms of the dyes are unusually high (up to 9 x 10(-7) cm2 s-1) at low dye concentrations in the film and show a dramatic decrease with increasing concentration. These results are interpreted in terms of recently proposed models for transport through Nafion as well as to the formation of dye dimers and/or higher aggregates in the Nafion film. This is demonstrated for methylene blue by spectrophotometric experiments where the dye was incorporated in Nafion films at different concentrations.

引用

页码：881 / 887

页数：7

共 43 条

[1]

Abruna H., 1988, ELECTRORESPONSIVE MO, V1

[2] COORDINATION CHEMISTRY IN 2 DIMENSIONS - CHEMICALLY MODIFIED ELECTRODES [J].