ORAL

SESSION: AdvancedMaterialsWedAM-R6	Marquis International Symposium on New and Advanced Materials and Technologies for Energy, Environment and Sustainable Development(3rd Intl Symp. on New and Advanced Materials and Technologies for Energy, Environment and Sustainable Development)
Wed Oct, 25 2017	Room: Condesa IA
Session Chairs: Qizhen Li; Kunichi Miyazawa; Session Monitor: TBA

12:00: [AdvancedMaterialsWedAM03]
High-Resolution Transmission Electron Microscopy Characterization of Hexagonal C60 Fullerene Nanowhiskers
Kunichi Miyazawa¹ ; Yumi Tanaka¹ ; Yoshihiro Nemoto² ; Takatsugu Wakahara² ; Konno Toshio² ; ¹Tokyo University of Science, Tokyo, Japan; ²National Institute for Materials Science, Tsukuba, Japan;
Paper Id: 174 [Abstract]

C60 fullerene nanowhiskers (C60FNWs) are thin needle-like crystals composed of C60 molecules. Up to now, a wide range of energy, electronics, medical and environmental application studies of C60FNWs have been performed for transistors, solar cells, superconductors, chemical sensors, scaffolds for cell growth, amino acid adsorbents and so forth. One of the important characteristics of C60FNWs is that they can be easily synthesized in solution using a liquid-liquid interfacial precipitation (LLIP) method. C60FNWs have two crystal structures of face-centered cubic (fcc) structure and hexagonal close-packed (hcp) structure. The fcc C60FNWs can be abundantly synthesized. However, since the yield of hexagonal close-packed C60FNWs (h-C60FNWs) synthesized by the LLIP method is very small, the microstructural characterization of h-C60FNWs has not been performed as yet. Hence, the microstructure of h-C60FNWs synthesized by the LLIP method were minutely investigated by high-resolution transmission electron microscopy (HRTEM). In addition to the HRTEM characterization of h-C60FNWs, the polymerization of C60FNWs by Raman laser beam was studied. A Raman laser-irradiated h-C60FNW exhibited a polycrystalline structure with smaller intermolecular distances of C60 than that of a pristine h-C60FNW without the laser irradiation. The spectra of electron energy loss spectrometry for the laser-irradiated h-C60FNW showed broadened pi* bands. Through the Raman spectroscopy measurements and HRTEM observations, it is concluded that C60 oligomers, which are smaller than pentamers, were primarily formed by the laser irradiation.