Towards the selective formation of specific isomers of fullerenes: T - and p-dependence in the yield of various isomers of fullerenes C60–C84 |
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Authors: | Tomonari Wakabayashi Daisuke Kasuya Haruo Shiromaru Shinzo Suzuki Koichi Kikuchi Yohji Achiba |
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Institution: | 1. Department of Chemistry, Tokyo Metropolitan University, Hachioji, Tokyo 192-03, Japan
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Abstract: | Systematic fractional change in the yield of various isomers of fullerenes was revealed to strongly depend on temperature of a buffer gas. A new kinetic consideration is proposed for understanding the observed temperature- and pressure-dependence of yield of fullerenes. The model consists of three competitive reactions in consideration of plausible behaviors of a precursor, (1) decomposition into smaller fragments, (2) isomerization leading to formation of a stable fullerene cage, and (3) growth into a larger carbon cluster. Arrhenius activation energy of formation of stable fullerenes was determined to be 0.8 eV for both C60 and C70, while a higher energy of 2.0?3.3 eV for seven different isomers of higher fullerenes ranging from C76 to C84. Correlation in the activation energy is noted for a series of higher fullerenes with different sizes, suggesting the existence of a specific precursor in their formation processes. |
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