Molecular organization and electrical properties of mixed Langmuir-Blodgett multilayer thin films of polypyrrole

Conference · Sun Jan 01 04:00:00 EST 1989

DOI:https://doi.org/10.1007/978-94-009-2041-5_6· OSTI ID:7152102

Cheung, J.; Rosner, R. B.; Rubner, M. F. ^[1]; Yang, X. Q.; Chen, J.; Skotheim, T. A. ^[2]

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1. Massachusetts Inst. of Tech., Cambridge, MA (USA). Dept. of Materials Science and Engineering
2. Brookhaven National Lab., Upton, NY (USA)

The molecular organization of Langmuir-Blodgett multilayer thin films containing electrically conductive polypyrrole chains dispersed throughout insulating domains of surface active pyrrole molecules was examined by several thin film spectroscopic techniques. Reflection-absorption FTIR and NEXAFS spectroscopy have revealed that the 3-ODOP (3-octadecanoyl pyrrole) surface active pyrrole molecules are highly oriented within the film with their fully extended hydrocarbon chains tilted away from the surface normal with an unusually large tilt angle of about 55{degrees}. Evidence for preferred orientation of the polypyrrole chains was also found. The multilayer films were found to exhibit very large dielectric constants (>100) at low frequencies and enormous conductivity anisotropies. These unusual electrical properties can be directly attributed to the molecular organization of the film which consists of polypyrrole chains sandwiched between well ordered layers of 3-ODOP molecules. 7 refs., 3 figs.

• Research Organization: Brookhaven National Lab., Upton, NY (USA)
• Sponsoring Organization: DOD; DOE/ER; NSF
• DOE Contract Number: AC02-76CH00016
• OSTI ID: 7152102
• Report Number(s): BNL-43851; CONF-8909307--1; ON: DE90007627
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360603* -- Materials-- Properties
AZOLES
DIELECTRIC PROPERTIES
ELECTRICAL PROPERTIES
FILMS
HETEROCYCLIC COMPOUNDS
INFRARED SPECTRA
ORGANIC COMPOUNDS
ORGANIC NITROGEN COMPOUNDS
PHYSICAL PROPERTIES
POLYMERS
PYRROLES
SPECTRA
THIN FILMS