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Please use this identifier to cite or link to this item: http://hdl.handle.net/10204/3727

Title: Filament poisoning at typical carbon nanotube deposition conditions by hot-filament CVD
Authors: Oliphant, CJ
Arendse, CJ
Malgas, GF
Motaung, DE
Muller, TFG
Halindintwali, S
Julies, BA
Knoesen, D
Keywords: Filament poisoning
Carbon nanotube deposition
Hot-filament CVD
Hot-filament chemical vapour deposition
HFCVD
Tungsten filaments
Morphology
Material science
Issue Date: May-2009
Publisher: Springer - Verlag
Citation: Oliphant, CJ, Arendse, CJ, Malgas, GF et al. 2009. Filament poisoning at typical carbon nanotube deposition conditions by hot-filament CVD. Journal of Materials Science, Vol. 44(10), pp 2610-2616
Abstract: This paper reports on the poisoning of tungsten filaments during the hot-filament chemical vapour deposition process at typical carbon nanotube (CNT) deposition conditions and filament temperatures ranging from 1400 to 2000 °C. The morphological and structural changes of the filaments were investigated using scanning electron microscopy and X-ray diffraction, respectively. Results conclusively show that the W-filament is not stable during the carburization process and that both mono- and ditungsten-carbides form within the first 5 min. Cracks and graphitic microspheres form on the carbide layer during the first 15 min at the temperatures =1600 °C. The microspheres subsequently coalesce to form a graphite layer, encapsulating a fully carburized filament at the temperature of 2000 °C after 60 min, which inhibits the catalytic activity of the filament to produce atomic hydrogen. The structural changes of the filament also induce variations in its temperature, illustrating the instability of the filament during the deposition of CNTs
Description: Copyright: 2009 Springer-Verlag. This is the author's version of the work. It is posted here by permission of Springer-Verlag for your personal use. Not for redistribution. The definitive version was published in the Journal of Materials Science, Vol. 44(10), pp 2610-2616
URI: http://hdl.handle.net/10204/3727
http://www.springerlink.com/content/9662347m4r726532/fulltext.pdf
ISSN: 0022-2461
Appears in Collections:National Centre for nano-structured materials
Nanotechnology
General science, engineering & technology

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