Hostname: page-component-7479d7b7d-jwnkl Total loading time: 0 Render date: 2024-07-12T17:29:18.509Z Has data issue: false hasContentIssue false
  • English
  • Français

New Strategies for Preparing Electrically Conductive Langmuir-Blodgett Films

Published online by Cambridge University Press:  25 February 2011

J. H. Cheung ,
R. B. Rosner  and
M. F. Rubner
J. H. Cheung
Affiliation:
Department of Materials Science and Engineering, Massachusetts Institute of Technology, Cambridge, MA 02139.
R. B. Rosner
Affiliation:
Department of Materials Science and Engineering, Massachusetts Institute of Technology, Cambridge, MA 02139.
M. F. Rubner
Affiliation:
Department of Materials Science and Engineering, Massachusetts Institute of Technology, Cambridge, MA 02139.
Get access

Abstract

The fabrication, structure and electrical properties of new electrically conductive Langmuir-Blodgett (LB) films of polyaniline and polypyrrole have been investigated. Polyaniline in its emeraldine-base form was mixed with stearic acid (PAN-B/SA) to produce stable films at the air-water interface (5/1 or 10/1 mole ratio of PAN-B/SA). These films were then transferred into multilayer films which were found to exhibit conductivities of about 1 S/cm upon doping with hydrochloric acid. The alkyl chains of the stearic acid molecules were found to be distributed randomly throughout the LB film thereby exerting a minimal influence on the electrical properties of the polyaniline phase. In addition to this mixed monolayer approach, a novel method of fabricating highly conductive polypyrrole LB films has been developed. This method is based on the sequential exposure of ferric stéarate LB films to hydrogen chloride (HC1) gas and pyrrole vapor. Each of these two solid state reactions was found to impart dramatic chemical and structural changes to the film. Polypyrrole LB films with conductivities as high as 5 S/cm were produced via this process. The electrical and optical properties of films made by both techniques were examined in order to elucidate their structure/property relationships.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 247: Symposium N – Electrical, Optical, and Magnetic Properties of Organic Solid State Materials , 1992 , 859
Copyright
Copyright © Materials Research Society 1992

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

REFERENCE

1. Rubner, M. F., Skotheim, T. A., in Conjugated Polymers: The Novel Science and Technology of Conducting and Nonlinear Optically Active Materials, edited by Bredas, J.L. and Silbey, R. (Kluwer Academic Publishers, Dordrecht, 1991), p. 363.Google Scholar
2. Punkka, E., Rubner, M. F., Hettinger, J. D., Brooks, J. S. and Hannahs, S. T., Phys. Rev. B, 43, 9076 (1991).Google Scholar
3. Rosner, R. B. and Rubner, M. F., Mat. Res. Soc. Symp. Proc. 173, 363 (1990).Google Scholar
4. MacDiarmid, A. G., Chiang, J. C., Halpern, M., Huang, W. S., Mu, S. L., Somasiri, M. L., Wu, W. and Yaniger, S. I., Mol. Cryst. Liq. Cryst, 121, 173 (1985).Google Scholar
5. Rosner, R. B. and Rubner, M. F., Chem. Comm., in press, (1991).Google Scholar
6. Wang, Yading, Ph. D. thesis, Department of Chemical Engineering, M. I. T. (1991).Google Scholar
7. Sariciftci, N. S., Bartonek, M., Kuzmany, H., Neugebauer, H. and Neckel, A., Syn. Met., 29, E193 (1989).Google Scholar