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Raman study of the temperature-induced decomposition of the two-dimensional rhombohedral polymer of C60 and the intermediate states formed |
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| Authors: | KP Meletov D Christofilos Y Iwasa S Yamanaka |
| Affiliation: | a Institute of Solid State Physics of RAS, Chernogolovka, Moscow Region 142432, Russia b Physics Division, School of Technology, Aristotle University of Thessaloniki, 54124 Thessaloniki, Greece c Department of Applied Sciences, Technological Educational Institute of Thessaloniki, 57400 Sindos, Greece d Institute for Materials Research, Tohoku University, 2-1-1 Katahira, Aoba-ku, Sendai 980-8577, Japan e CREST, Japan Science and Technology Corporation, Kawaguchi 332-0012, Japan f Department of Applied Chemistry, Faculty of Engineering, Graduate School of Engineering, Hiroshima University, Higashi-Hiroshima 739-8527, Japan |
| Abstract: | Raman spectra of single crystalline two-dimensional rhombohedral (2D-R) polymer of C60 were measured at ambient conditions after its high temperature treatment (HTT) in order to study the polymer decomposition process. The data obtained indicate that the 2D-R polymer remains stable after 0.5 h treatment up to ∼503 K, while at higher temperatures a material transformation takes place. New Raman lines appear in the Raman spectrum after HTT in the range of 513-553 K, related to the Ag(2) pentagon pinch (PP) mode of 2D tetragonal-like (2D-T-like) and 1D orthorhombic-like (1D-O-like) oligomers as well as to C60 dimers and monomers, typical for an intermediate state of partially decomposed 2D-R polymer. Above 553 K, the material changes completely and its new composition is dominated by C60 monomers with some possible inclusion of C60 dimers. The activation energy of the 2D-R polymer decomposition, obtained from the dependence of the decomposition time on the treatment temperature, is EA = 1.76 ± 0.07 eV/molecule. |
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