Carbon linear chains inside multiwalled nanotubes |
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Authors: | E. Cazzanelli L. Caputi A. Cupolillo L. Papagno |
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Affiliation: | a LICRYL (CNR-INFM) and Center of Excellence CEMIF. CAL, Department of Physics, University of Calabria, Arcavacata di Rende 87036, Italy b Department of Physics, University of Calabria, Arcavacata di Rende 87036, Italy c Department of Physics, University of Calabria and Istituto Nazionale di Fisica Nucleare, Gruppo collegato di Cosenza, Arcavacata di Rende 87036, Italy |
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Abstract: | Multiwalled carbon nanotubes have been deposited on graphite cathodes by using an arc discharge technique in He atmosphere, with the insertion of a catalytic Ni-Cr mixture as well as without catalysers. The topography of such deposition has been investigated by SEM, while a parallel micro-Raman study has revealed, in particular regions of the deposited cathodes, strong bands in the range 1780-1860 cm−1, assignable to linear carbon chains inside the nanotubes. The variation of intensity, frequency and bandwidth of such bands has been investigated, in relation with the spectral characters of the host multiwalled carbon nanotube. In the cathode deposited without catalyst a quite ordered configuration of multiwalled carbon nanotubes is obtained in the central zone, while the maximum concentration of linear carbon chains is found in a ring shaped zone just inside the border. In sample obtained with catalyst the deposited multiwalled carbon nanotubes appear always more disordered, and a remarkable concentration of carbon chains appears in some zones, with a more casual distribution. |
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Keywords: | Multiwalled carbon nanotubes Linear carbon chains Arc discharge synthesis Raman spectroscopy |
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