C₇₀, one of the higher fullerenes, has narrow band gap than C₆₀. So C₇₀ is very interesting for the application to a nanoelectronic device. However, it is difficult to get a high quality C₇₀ crystal because C₇₀ has some phase transitions near room temperature and symmetry being lower than C₆₀. Therefore there are fewer studies on solid state properties of C₇₀ than C₆₀. Recently, for the control of the crystal shape, much attention has been paid for the solution growth. A liquid–liquid interfacial precipitation method (LLIP method) leads to not only the control of crystal shapes but also the short time growth for the crystals [1]. The LLIP method is expected as an effective method for practical use. In this paper, we report the growth of C₇₀ nanosheets by LLIP method.

 C₇₀ nanosheets were prepared by LLIP method with an interface between C₇₀-saturated toluene with ferrocene and IPA. Fig. 1 shows an optical microscopic image of C₇₀ nanosheets grown for 24 hours by LLIP method. They exhibit hexagonal shapes with about 300 nm in thickness and 5 µm in diameter. Fig. 2 shows XRD pattern of C₇₀ nanosheets. From the XRD pattern, the structure of C₇₀ nanosheets exhibits a monoclinic structure including ferrocene (a = 27.15Å, b = 10.21Å, c = 19.25Å, β = 121.73°). In addition, it should be noted that the monoclinic structure of C₇₀ nanosheets change to a face-centered cubic one with annealing at 200ºC. We present the growth of C₇₀ nanosheets, and their physical properties such as structural, optical and electrical properties.

Fig.1 The optical microscopic image of C₇₀ nanosheets.

Fig. 2 The XRD pattern of C70 nanosheets.

[1] T. Wakahara et al. J. Am. Chem. Soc 131 (2009) 6372

Corresponding author: Masaru Tachibana, YokohamaCity University, 22-2 Seto, Kanazawa-ku,Yokohama 2360027, Japan, Tel &Fax: +81-45-787-2360,E-mail: [email protected]

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