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Ahn, Sejung,Kim, Yukyung,Beak, Seungjae,Ishimoto, Shohei,Enozawa, Hideo,Isomura, Eigo,Hasegawa, Masashi,Iyoda, Masahiko,Park, Yungwoo The Royal Society of Chemistry 2010 Journal of materials chemistry Vol.20 No.48
<p>We synthesized 4,5-bis(octadecylthio)-4′,5′-bis(ethylcarbamoyl)tetrathiafulvalene and measured the electrical conductivity of its perchlorate (ClO<SUB>4</SUB><SUP>−</SUP>)-doped nanofibers, which have double and triple helix structures. The nanostructure of the bis(octadecylthio)-TTF–diamide and its ClO<SUB>4</SUB><SUP>−</SUP>-doped fibers in a 3 : 1 ratio was deduced in relation to the X-ray crystal structure of bis(methylthio)-TTF–diamide. The doubly coiled nanofibers form when initially formed spiral ribbons of lamellarly arranged TTF–diamide perchlorate split in the middle, and a further split of the double helix produces the triplex structure. Temperature-dependent conductance and current–voltage (<I>I</I>–<I>V</I>) characteristics of the coiled fibers were measured in the temperature (<I>T</I>) range of 70–300 K. The conductance decreased with a decrease in <I>T</I>, and the <I>I</I>–<I>V</I> characteristics were nonlinear over the entire <I>T</I> range. The results were analyzed by using a modified fluctuation-induced tunneling conduction model, where the barrier height and width were linearly dependent on the electric field.</p> <P>Graphic Abstract</P><P>The double- and triple-helix nanofibers having tunneling conduction behavior are synthesized by splitting the spiral ribbons arising from lamellarly arranged TTF–diamide and intercalated perchlorate ion in the 3 : 1 ratio. <img src='http://pubs.rsc.org/ej/JM/2010/c0jm02628j/c0jm02628j-ga.gif'> </P>