Тип публикации: статья из журнала

Год издания: 2013

Идентификатор DOI: 10.1016/j.carbon.2013.06.022

Ключевые слова: Carbon molecules, Excitation temperature, Fullerene content, Helium pressure, High frequency HF, Higher fullerenes, Radial temperature gradients, Top-down process, Emission spectroscopy, Helium, Fullerenes

Аннотация: We show that in a carbon-helium high-frequency (66 kHz) arc discharge the fullerene yield and composition can be controlled by changing the helium pressure. By emission spectroscopy we could derive the excitation temperature within the arc. We found that the radial temperature gradient of the arc plasma increases with increasing prПоказать полностьюessure. We further found that with increasing pressure the yield of fullerenes reaches a maximum of 12.6 wt.% at 0.12 MPa pressure and in the range from 0.16 to 0.38 MPa the fullerene content in the carbon soot stays within the limits of 7.2-7.0 wt.%. The content of Cm and higher fullerenes relative to the total amount of extractable fullerenes increases with pressure. Our results suggest that in the carbon-helium plasma fullerenes are mainly formed in a top-down process by the decay and annealing of large, hot precursor carbon molecules. (C) 2013 Elsevier Ltd. All rights reserved.

Журнал: CARBON

Выпуск журнала: Vol. 62

Номера страниц: 389-392

ISSN журнала: 00086223

Место издания: OXFORD

Издатель: PERGAMON-ELSEVIER SCIENCE LTD

• Churilov G.N. (Siberian Federal University)
• Osipova I.V. (L.V. Kirensky Institute of Physics SB RAS)
• Glushenko G.A. (Krasnoyarsk State Pedagogical University,Centre of Cross-Disciplinary Investigation)
• Vnukova N.G. (Krasnoyarsk State Pedagogical University,Centre of Cross-Disciplinary Investigation)
• Kolonenko A.L. (Krasnoyarsk State Pedagogical University,Centre of Cross-Disciplinary Investigation)
• Dudnik A.I. (L.V. Kirensky Institute of Physics SB RAS)
• Kratschmer W. (Max-Planck Institute for Nuclear Physics)

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