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Synthesis and Characterization of Fullerene Nanowhiskers by Liquid-Liquid Interfacial Precipitation: Influence of C60 Solubility
Molecules 2012, 17(5), 4851-4859; doi:10.3390/molecules17054851

Superconducting Fullerene Nanowhiskers

1,2,* , 1, 1, 1, 1,2, 1,2, 1,2 and 1,2
1 National Institute for Materials Science, Tsukuba, Ibaraki 305-0047, Japan 2 Transformative Research Project on Iron Pnictides (TRIP), Japan Science and Technology Agency, Chiyoda-ku, Tokyo 102-0075, Japan
* Author to whom correspondence should be addressed.
Received: 31 March 2012 / Revised: 12 April 2012 / Accepted: 18 April 2012 / Published: 26 April 2012
(This article belongs to the Special Issue Fullerene Chemistry)
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We synthesized superconducting fullerene nanowhiskers (C60NWs) by potassium (K) intercalation. They showed large superconducting volume fractions, as high as 80%. The superconducting transition temperature at 17 K was independent of the K content (x) in the range between 1.6 and 6.0 in K-doped C60 nanowhiskers (KxC60NWs), while the superconducting volume fractions changed with x. The highest shielding fraction of a full shielding volume was observed in the material of K3.3C60NW by heating at 200 °C. On the other hand, that of a K-doped fullerene (K-C60) crystal was less than 1%. We report the superconducting behaviors of our newly synthesized KxC60NWs in comparison to those of KxC60 crystals, which show superconductivity at 19 K in K3C60. The lattice structures are also discussed, based on the x-ray diffraction (XRD) analyses.
Keywords: fullerene nanowhisker; superconductor; potassium intercalation fullerene nanowhisker; superconductor; potassium intercalation
This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).

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Takeya, H.; Miyazawa, K.; Kato, R.; Wakahara, T.; Ozaki, T.; Okazaki, H.; Yamaguchi, T.; Takano, Y. Superconducting Fullerene Nanowhiskers. Molecules 2012, 17, 4851-4859.

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