Infrared transmission and reflection-absorption studies of Langmuir-Blodgett thin films comprised of poly(3-alkylthiophenes) and cadmium stearate

Journal Article · Thu Nov 29 00:00:00 EST 1990 · Journal of Physical Chemistry; (USA)

DOI:https://doi.org/10.1021/j100387a016· OSTI ID:6110047

Watanabe, I; Cheung, J H; Rubner, M F ^[1]

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1. Massachusetts Institute of Technology, Cambridge (USA)

The level and type of molecular orientation present in mixed Langmuir-Blodgett thin films containing poly(3-alkylthiophene) and deuterated cadmium stearate molecules were examined by using transmission and reflection-absorption FTIR techniques. For films fabricated with polythiophenes comprised of butyl, hexyl, or octyl side chains, it was found that the cadmium stearate molecules prefer to assemble into well-ordered, phase-separated stacks with a molecular organization very similar to that observed in homogeneous LB films of this material. The polymer molecules, on the other hand, maintain a state of essentially random orientation over the entire compositional range of the mixed films. The most highly ordered domains of cadmium stearate molecules were found in films containing low polymer contents. For LB films fabricated with poly(3-octadecylthiophene), on the other hand, a higher level of molecular mixing with the cadmium stearate-d molecules, encouraged primarily by the longer alkyl side chain of the polymer, strongly inhibited the formation of well-ordered domains of cadmium stearate molecules, particularly at high polymer loadings.

• OSTI ID: 6110047
• Journal Information: Journal of Physical Chemistry; (USA), Vol. 94:24; ISSN 0022-3654
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
STEARATES
ABSORPTION SPECTROSCOPY
INFRARED SPECTRA
MOLECULAR STRUCTURE
THIOPHENE
EXPERIMENTAL DATA
MEASURING METHODS
THIN FILMS
CARBOXYLIC ACID SALTS
DATA
FILMS
HETEROCYCLIC COMPOUNDS
INFORMATION
NUMERICAL DATA
ORGANIC COMPOUNDS
ORGANIC SULFUR COMPOUNDS
SPECTRA
SPECTROSCOPY
360602* - Other Materials- Structure & Phase Studies