Journal
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
Volume 198, Issue -, Pages 45-51Publisher
ELSEVIER
DOI: 10.1016/S0927-7757(01)00913-X
Keywords
Langmuir film; surface potential-area isotherm; pyrrole-thiophene AB copolymer; brewster angle microscopy; electrical conductivity
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A report is made of Langmuir film of a new semi-amphiphilic alternating N-hexylpyrrole-thiophene AB copolymer (PHPT) that is amenable to transfer as Langmuir-Blodgett (LB) films. PHPT was synthesized by condensation copolymerization via Stille coupling between N-hexyl-2,5-bis(trimethylstannyl)pyrrole and 2,5-dibromothiophene in the presence of Pd(PPh3)(2)Cl-2 as a catalyst in dry DMF and characterized with various analytical techniques. In contrast to homopolymers (e.g. poly(N-alkylpyrrole)s and poly(3-alkylthiophene)s). PHPT formed a reasonably stable monolayer, as inferred through surface pressure and surface potential isotherms. and Brewster angle microscopy (BAM). The dependence of monolayer characteristics on the spreading volume, subphase temperature and compression speeds was also investigated. Electrical characterization revealed the possibility of using PHPT LB films as gas sensors. (C) 2002 Elsevier Science B.V. All rights reserved.
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