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Abstract
Raman spectroscopy is employed to study the high-pressure response of carbon nanofibers exhibiting a unique morphology of stacked, truncated conical graphene layers (cups) along the longitudinal fiber axis (stacked-cup carbon nanofibers). The pressure evolution of the observed Raman peaks is smooth and reversible, and their pressure coefficients suggest an intermediate structural morphology between graphite and multiwall carbon nanotubes. The pressure coefficients are similar to those exhibited by the pressure-induced collapsed structures of large-diameter nanofibers and macroscopic fibers, suggesting the enhanced size-related rigidity of the studied system.
Acknowledgements
The authors thank Dr. M. Kollia for her technical assistance in TEM measurements and Grupo Antolin for providing the samples. K.P. and C.G. acknowledge financial support from the Marie-Curie Transfer of Knowledge program CNTCOMP (Contract No. MTKD-CT-2005-029876). Also, K.P. acknowledges the Research Committee of the University of Patras for financial support.