Abstract
We have obtained very stable Langmuir films from a (1:1) mixture of a tetrathiafulvalene (TTF) derivative (ethylenedithiodioctadecylthio TTF) with ω-tricosenoic acid, compressed on a pure water subphase at surface pressures up to about 35 mN/m. These films can be transferred by the classical Langmuir-Blodgett method with a constant transfer efficiency close to unity, and films more than 100 layers thick can be built up in this way. After exposure to iodine vapor and subsequent moderate heating at about 40°C, these films become conducting, and their in-plane direct current conductivity reaches a value of about 2 × 10 −1 Ω −1 · cm −1 at room temperature. A preliminary interpretation of this behavior is proposed and strong arguments are brought out in favor of an electronic conduction mechanism arising from a mixed valence state in the TTF derivative array.
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