Abstract
Conductive ultra thin films were fabricated from mixed monolayers containing stearic acid and structurally homogeneous poly (3-hexyl-thiophene), which had almost 100% head-to-tail couplings with a M w of 8100 ( M w M n =1.5) as estimated by 1H NMR, 13C NMR, and gel permeation chromatography. The mixed monolayers were found to be stable at the air-water interface and could be readily deposited onto solid substrates as Y-type films by the vertical lifting method. These Langmuir-Blodgett (LB) films exhibited well-defined layered structures as determined by UV-Vis absorption and X-ray diffraction measurements. The conductivity of the mixed LB films doped with NOPF 6 was in the range of 50–100 S cm −1 and was 50- to 100-fold higher than that of the mixed LB films using poly(3-hexylthiophene) synthesized by the usual chemical oxidation with FeCl 3.
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