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Synthesis of coiled carbon nanotubes on Co/Al2O3 catalysts in a fluidised-bed

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Abstract

Mixtures of regularly coiled and straight multi-walled carbon nanotubes (MWNTs) were synthesised on alumina supported Co catalysts prepared by pH controlled, wet impregnation. The synthesis reaction was performed under C2H2:H2:N2 at 750 °C in a fluidised-bed for 30 min. Scanning electron microscopy/energy dispersive X-ray spectroscopy shows good distribution of the active Co particles on the surface of the alumina support. Determined from 10 individual SEM images from the same product batch, the CNTs present are typically from 10 to 40 nm in diameter. Thermogravimetric analysis (TGA) and Raman spectroscopy indicate the total oxidative weight loss is independent of pH during catalyst preparation. This study is the first to report the use of a fluidised-bed for the synthesis of coiled MWNTs, using alumina supported Co catalysts.

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Acknowledgements

JL is grateful to the School of Chemical and Biomolecular Engineering at the University of Sydney for a Postgraduate Research Scholarship. The authors are grateful to University of Sydney’s Electron Microscopy Unit for assistance with the acquisition of the SEM/EDX and TEM images and Dr. E. Carter for assistance with Raman spectroscopy.

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Correspondence to Andrew T. Harris.

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Liu, J., Harris, A.T. Synthesis of coiled carbon nanotubes on Co/Al2O3 catalysts in a fluidised-bed. J Nanopart Res 12, 645–653 (2010). https://doi.org/10.1007/s11051-009-9634-x

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  • DOI: https://doi.org/10.1007/s11051-009-9634-x

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