ELECTRIC PROPERTY OF INSULATED MOLECULAR WIRE FORMED BY CONDUCTING POLYMER AND MOLECULAR NANOTUBE

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We have recently found a novel kind of molecular wire formed by the molecular nanotube synthesized from cyclodextrins (CDs) and a conducting polymer, polyaniline (PANI), and observed the structure of the insulated molecular wire by atomic force microscopy (AFM). This inclusion complex can be regarded as insulated molecular wire, because a conducting polymer is covered by CD molecules as insulator. In this study, we aim to make a molecular device using a single insulated molecular wire as a material for the connection between the external electrodes.Since it is quite difficult to fabricate the fine electrodes with a gap of 100 nm scale by using photo lithography, we have successfully made SiO_2 substrates with electrodes (the gap bewtween electrodes is ca. 500 nm) by AFM lithography. Electrodes are isolated each other, that is, the resistivity between each electrodes is more than 10 TΩ, and this substrate with electrodes has shown good property when we deposited the carbon nanotube to bridge the gap between electrodes.We have successfully deposited the insulated molecular wire to bridge the gap between electrodes and measured the conductivity of a single insulated molecular wire without dope for the first time in the world. Since it is expected that the doped insulated molecular wire had high conductivity, we try to measure the doped insulated molecular wire now. Further, we plan to measure the temperature dependence of the conductivity of a single insulated molecular wire.