Structural study of carbon nanomaterials prepared by chlorination of tungsten carbide and bis(cyclopentadienyl)tungsten dichloride

Hollow carbon nanobags have been obtained by the chlorination of bis(cyclopentadienyl)tungsten dichloride (W(C 5H 5) 2Cl 2) at 400 and 900 °C. Transmission electron microscopy images indicate an incipient graphitisation at higher reaction temperatures and an increase in the average dimensions of the...

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Bibliographic Details
Published in:Carbon (New York) 2010-11, Vol.48 (13), p.3667-3675
Main Authors: González-García, P., Urones-Garrote, E., Ávila-Brande, D., Gómez-Herrero, A., Otero-Díaz, L.C.
Format: Article
Language:English
Subjects:
Bonding
Carbon
Chlorination
Dichlorides
Nanocomposites
Nanomaterials
Nanostructure
Tungsten carbide
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Summary:Hollow carbon nanobags have been obtained by the chlorination of bis(cyclopentadienyl)tungsten dichloride (W(C 5H 5) 2Cl 2) at 400 and 900 °C. Transmission electron microscopy images indicate an incipient graphitisation at higher reaction temperatures and an increase in the average dimensions of the particles. When using tungsten carbide (WC) as precursor, carbide-derived carbon has been observed at 900 °C, whereas at lower temperatures core–shell-like structures have been found as intermediate reaction steps. In both type of materials, electron energy-loss spectroscopy shows a very similar sp 2 carbon bonding content (∼94%). Textural studies show Type 1 adsorption isotherms with surface areas of 1250 and 1320 m 2/g for WC and W(C 5H 5) 2Cl 2 respectively at the higher temperature treatment.
ISSN:0008-6223
1873-3891
DOI:10.1016/j.carbon.2010.06.003