Discovery of metallic state in a purely organic single-component conductor
Institute for Solid State Physics
Organic materials are often used as insulators, for example as the insulating coating of a wire. However, the field of organic electronics aims to develop organic materials that are highly conductive, similar to copper wire. Single-component organic conductors that have been developed so far are semiconductors with room-temperature conductivities of 10-6～10-1 Scm-1 because of large Coulomb repulsion between the electrons and small molecular interactions.
A team led by Professor Hatsumi Mori at the Institute for Solid State Physics, the University of Tokyo, has developed a new type of purely organic single-component conductor. This material has the highest room-temperature conductivity (19 Scm-1) and transitions into a metallic state at the lowest pressure (～10 k atm) yet achieved among purely organic single-component conductors.
Collaborative work with teams led by Professors Yoichi Murakami and Reiji Kumai at the Institute of Materials Structure Science, KEK, and Junior Staff Researcher Akiko Nakao at the Comprehensive Research Organization for Science and Society (CROSS) showed the newly developed, highly conductive organic single-component material is composed of highly symmetric molecular units linked by strong hydrogen bonds to form two-dimensional conductive layers.
Organic materials are generally soluble and therefore can be applied to printed electronics. One anticipated use of this material is as a next-generation organic electronic material, for example, for single-component organic wiring.
The results of this research have been published in Nature Communications.
Ppress release [pdf] (Japanese)
T. Isono, H. Kamo, A. Ueda, K. Takahashi, A. Nakao, R. Kumai, H. Nakao, K. Kobayashi, Y. Murakami, and H. Mori,
“Hydrogen bond-promoted metallic state in a purely organic single-component conductor under pressure”,
Nature Communications Online Edition: 2013/1/9 (Japan time), doi: 10.1038/ncomms2352.
Comprehensive Research Organization(Japanese)