Carbon nanorods and graphene-like nanosheets by hot filament CVD : growth mechanisms and electron field emission
Wang, B.B., Ostrikov, K., van der Laan, T., Zheng, K., Wang, J.J., Yan, Y.P., & Quan, X.J. (2013) Carbon nanorods and graphene-like nanosheets by hot filament CVD : growth mechanisms and electron field emission. Journal of Materials Chemistry C, 1(46), pp. 7703-7708.
Carbon nanorods and graphene-like nanosheets are catalytically synthesized in a hot filament chemical vapor deposition system with and without plasma enhancement, with gold used as a catalyst. The morphological and structural properties of the carbon nanorods and nanosheets are investigated by field-emission scanning electron microscopy, transmission electron microscopy and micro-Raman spectroscopy. It is found that carbon nanorods are formed when a CH4 + H2 + N2 plasma is present while carbon nanosheets are formed in a methane environment without a plasma. The formation of carbon nanorods and carbon nanosheets are analyzed. The results suggest that the formation of carbon nanorods is primarily a precipitation process while the formation of carbon nanosheets is a complex process involving surface-catalysis, surface diffusion and precipitation influenced by the Gibbs–Thomson effect. The electron field emission properties of the carbon nanorods and graphene-like nanosheets are measured under high-vacuum; it is found that the carbon nanosheets have a lower field emission turn-on than the carbon nanorods. These results are important to improve the understanding of formation mechanisms of carbon nanomaterials and contribute to eventual applications of these structures in nanodevices.
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|Item Type:||Journal Article|
|Divisions:||Current > QUT Faculties and Divisions > Science & Engineering Faculty|
|Deposited On:||08 Jul 2014 23:57|
|Last Modified:||10 Jul 2014 00:39|
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