Polyheterocycle Langmuir-Blodgett Films
Abstract
The increasing interest in organic and polymeric electroactive materials arises from their potential applications in synthetic membranes, nonlinear optical elements, sensors, and microelectronic devices. Two types of polyheterocycle Langmuir-Blodgett films have been fabricated: 1) copolymers of pyrrole and 3-alkyl pyrrole (3-hexadecylpyrrole and octadecylpyrrole) LB films; 2) mixtures of poly(3-alkyl thiophene) and stearic acid LB films. The orientation of single- and multi-layer films on platinum substrates have been studied by Near Edge X-ray Absorption Fine Structure (NEXAFS) spectroscopy which also provides information about interaction between the aromatic groups and the metallic substrate. The alkylsubstituted pyrrole are more disordered. In the case of mixtures of poly(3-alkyl thiophene) and stearic acid LB films, the hydrocarbon chains of the stearic acid molecules are highly ordered. The poly(3-alkyl thiophene) components, on the other hand exhibit random orientation of the thiophene moities. The orientation of the hydrocarbon chain of the poly(3-alkyl thiophene) varies with the chain length, from random to highly ordered along the surface normal of the substrate, as the chain length changes from 4 carbon units to 18 carbon units.
Document Details
- Document Type
- Technical Report
- Publication Date
- May 29, 1989
- Accession Number
- ADA210625
Entities
People
- Daniel A. Fischer
- I. Watanabe
- Jiayu Chen
- K. Hong
- L. Samuelson
- M. F. Rubner
- M. L. Denboer
- P. D. Hale
- S. Trpathy
- T. A. Skotheim
- T. Inagaki
- Xuezong Yang
- Y. Okamoto