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    Conductivity Measurement of Polydiacetylene Thin Films by Double-Tip Scanning Tunneling Microscopy

    Year: 2004

    Journal: J. Phys. Chem. B 2004, 108, 16353-16356, 20111221

    Authors: Kazuhiro Takami, Jun Mizuno, Megumi Akai-kasaya, Akira Saito, Masakazu Aono, and Yuji Kuwahara

    Organizations: Department of Material and Life Science, Osaka UniVersity, 2-1 Yamada-oka, Suita, Osaka 565-0871, Japan, Nanoscale Quantum Conductor Array Project, ICORP, Japan Science and Technology Agency (JST), 4-1-8 Honmachi, Kawaguchi, Saitama 332-0112, Japan, Harima Institute, The Institute of Physical and Chemical Research (RIKEN), 1-1-1 Kokuto, Mikazuki, Hyogo 679-5148, Japan, and Nanomaterials Laboratory, National Institute of Material Science (NIMS), 3-13 Sakura, Tsukuba, Ibaraki 305-0003, Japan

    The conductivity of polydiacetylene thin films has been evaluated in the region below 20 m using a newly constructed independently driven double-tip scanning tunneling microscope. The polydiacetylene thin films fabricated by means of the Langmuir-Blodgett method showed the formation of islands with sizes of 2-20 m with the polydiacetylene backbone extended in one direction in each island. It was indicated that the resistance of the polydiacetylene thin films is proportional to the tip-tip distances, suggesting one-dimensional conduction along the polydiacetylene backbones, which was clearly different from that of two-dimensionally uniform conductive thin films of poly(3-octylthiophene). The conductivity of the polydiacetylene thin film was estimated to be (3-5) x 10-6 S/cm, which is 5 orders of magnitude higher than that in the previous report.