課題番号 ：S-16-KU-0028(NPQ16011)
利用形態 ：技術代行
利用課題名（日本語） ：フラーレン誘導体の構造解析
ProgramTitle(English) ：Structural analysis of fullerene derivatives
利用者名（日本語） ：速水　真也, N. N. Rabin
Username(English) ：S. Hayami, N. N. Rabin
所属名（日本語） ：熊本大学大学院先端科学研究部
Affiliation (English) ：Kumamoto University

１．概要（Summary ）
With the current widespread interest in hydrogen as a key renewable energy source, the search for new materials exhibiting fast hydrogen transport, and chemical stability has become increasingly more important. carbon allotropes including fullerene, carbon nanotube or graphene oxide containing oxygen functional groups are enable fast transport of proton in humidified condition through grotthus mechanism. In hydroxylated fullerene, control and quantification of the number of modified hydroxyl groups are important. In addition to CHN elemental analysis and TG analysis, by analyzing using a mass spectrometer, important information regarding quantification of functional groups was observed.
２．実験（Experimental）
Fullerene has been converted to fullerenols with formulas as C60 (OH)12, C6O (OH) 24 and C60 (OH) 36 through introduce oxygen functional groups based on some well known oxidizing technique. As prepared fullerenol samples were characterized by scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS), Fourier transform infrared spectroscopy (IR), Raman and mass spectroscopy. The proton conductivities of as prepared samples were measured by the four probe AC method using an impedance/gain phase analyzer (Solartron 1260) over the frequency range 1 to 106 Hz. Proton conductivities were measured under controlled temperature and humidity using an incubator.
Instrument used in Kyushu University: MALDI-TOF mass spectrometer
Purpose: Confirming number of hydroxyl groups
３．結果と考察（Results and Discussion）
XPS analysis confirmed the successful oxidation with significant oxygen functional groups. IR and Raman data also support the oxidation condition. The structural difference with respect to number of hydroxyl group attached as C60 (OH)12, C6O (OH) 24 and C60 (OH) 36 were confirmed by CHN elemental analysis, TG analysis and Mass spectra of as prepared sample. Impedance study suggested that, in contrast to pure fullerene which doesn’t show any protonic movement, in case of hydroxylated fullerene significant proton conductivity was observed. Maximum proton conductivity was observer for C6O (OH) 24 as 3.1×10-3 Scm-1. The water molecules adsorbed by hydrophilic oxygen functional groups are responsible for proton conductivity in hydroxylated fullerene.

４．その他・特記事項（Others）
Teacher in charge: Tsuyohiko Fujigaya

５．論文・学会発表（Publication/Presentation）
“High dielectric constant of two dimensional TiO2 and Ca2Nb3O10 nanosheet,” Rabin Nurun Nahar, ICAST2016, 2016.12.8

６．関連特許（Patent）
None