Polymer films on electrodes. 30. Electrochemistry and scanning electrochemical microscopy characterization of benzimidazolebenzophenanthroline-Type ladder (BBL) and semiladder (BBB) polymer films

Citation
M. Quinto et al., Polymer films on electrodes. 30. Electrochemistry and scanning electrochemical microscopy characterization of benzimidazolebenzophenanthroline-Type ladder (BBL) and semiladder (BBB) polymer films, CHEM MATER, 13(9), 2001, pp. 2824-2832
Citations number
41
Categorie Soggetti
Apllied Physucs/Condensed Matter/Materiales Science","Material Science & Engineering
Journal title
CHEMISTRY OF MATERIALS
ISSN journal
08974756 → ACNP
Volume
13
Issue
9
Year of publication
2001
Pages
2824 - 2832
Database
ISI
SICI code
0897-4756(200109)13:9<2824:PFOE3E>2.0.ZU;2-B
Abstract
Polymer-modified electrodes were obtained by spin-coating solutions of poly (benzobisimidazo-benzophenanthroline) ladder (BBL) and semiladder (BBB) pol ymers on indium-tin oxide electrodes. An electrochemical study of these fil ms showed reproducible and stable cyclic voltammograms for reduction of the polymer (in the absence of oxygen), the absence of waves for oxidation of the polymer, and brilliant changes in color during the potential scan. Meas urements with the scanning electrochemical microscope showed changes in the film conductivity, with the films being more conductive in the reduced for m. The potential dependence of the film resistance and atomic force microsc opic characterization are also reported. These results confirm the electron transport and electron-accepting nature of both BBL and BBB, which can acc ept up to two electrons per monomer repeat unit. Although the electrochromi c features of BBL and BBB are similar, a significant difference in the film morphologies was observed by atomic force microscopy.