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Open seminar

演 題 「Preparation and properties of fullerene C60 submicrofibers」
日 時 2011年12月06日(火) 16:00 より 17:00 まで
講演者 朴 光哲教授(青島科学技術大学)
場 所

山手3号館2階 共通セミナー室

概 要

C60 is a well-known fullerene prototype; zero-dimensional structure has been generally accepted for C60 fullerene. If it was possible to modify such a zero dimensional structure of C60 into a self-assembled 1-D structure, novel optoelectronic and magnetic properties might be expected. Recently, various synthesis methods have been developed for the preparation of 1D fullerene C60 micro/nano fibers (FNFs), such as solution evaporation, template technique, surfactant-assisted method and liquid-liquid interfacial precipitation method (LLIP). Compared with other synthesis method, the LLIP method is a simple and financially viable approach for directly growing FNFs that can be achieved at around room temperature and without the need for catalysts or surfactants.
Due to such merits, in this work 1D fullerene C60 FNFs were successfully through simple and easy-to-control LLIP by using toluene, m-xylene, pyridine and/or N-methyl-2-pyrrolidone (NMP) as good solvents and isopropyl alcohol as precipitation agent. There is a systematic correlation between the type of the solvents and the final structures of the C60 FNFs prepared using LLIP. When the solvents were toluene and m-xylene, solid C60 fullerene nanowhiskers (FNWs) were easily synthesized. On the other hand, the fullerene C60 micro/nano tubes (FNTs) were grown in the C60-pyridine solution or C60-NMP solution which was exposed to the visible light. The type of solvents plays a critical role in the formation of the final structure of C60 FNFs. In this presentation, the possible formation mechanism of the FNTs will be discussed in details and also show an approach in magnetic behavior of the FNFs under magnetic field and its photoluminescence.

その他

朴教授は、筑波大学・白川英樹教授指導のもと、1998年に博士学位を受けられた後に、引き続き同大学で研究員を勤められた。2006年に教授とし青島科学技術大学に移られて、現在に至っておられます。2010年7月より京都大学客員教授、物質材料機構客員研究員をなさっておられます。朴教授は、導電性高分子やフラーレンからなるナノ構造体で多彩な展開を精力的に進めておられ、本講演でも、フラーレンに関する最新の成果についてお話しいただく予定です。

お問合せ先

江 東林(物質分子科学研究領域)