Formation of hydrogen-capped polyynes by laser ablation of C60 particles suspended in solution |
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Authors: | Masaharu Tsuji Shingo Kuboyama Takeshi Tsuji |
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Affiliation: | a Institute for Materials Chemistry and Engineering, Kyushu University, Kasugakoen 6-1, Kasuga, Fukuoka 816-8580, Japan b Department of Applied Science for Electronics and Materials, Graduate School of Engineering Sciences, Kyushu University, Kasuga, Fukuoka 816-8580, Japan c CREST, Japanese Science and Technology, Kasuga, Fukuoka 816-8580, Japan |
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Abstract: | Laser ablation of C60 particles suspended in hexane or methanol solution has been studied using a Nd:YAG laser (266, 355, 532, and 1064 nm). Insoluble product analysis by Raman spectroscopy showed that C60 particles transformed to graphite-like ones. On the other hand, soluble product analysis by HPLC coupled with UV absorption spectroscopy and GC/MS demonstrated that linear hydrogen-capped polyynes (CnH2: n=8, 10, 12) were formed. The dominant CnH2 polyyne was C8H2 in all cases. The relative abundance of polyynes decreased with increasing wavelength of the Nd:YAG laser, except for 266-nm irradiation in hexane, where the relative abundance of polyynes at 355 nm was greater than that at 266 nm. It was therefore concluded that photochemical processes are more important than thermal ones for the formation of polyynes. The relative abundance of polyynes in hexane was greater than that in methanol. The dependence of relative abundance of polyynes on the particles concentration, laser irradiation time, and laser power was measured in order to obtain information on formation mechanism of polyynes. These results and reported laser photochemical processes of C60 molecules in the gas phase suggested that C2 radicals produced from C60 are polymerized and hydrogenated to form C8H2 and much smaller amounts of C10H2 and C12H2. |
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Keywords: | A Carbyne Fullerene B Laser irradiation C Chromatography Raman spectroscopy |
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