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Please use this identifier to cite or link to this item: http://apo.ansto.gov.au/dspace/handle/10238/4900

Title: Pretreatment Control of Carbon Nanotube Array Growth for Gas Separation: Alignment and Growth Studied Using Microscopy and Small-Angle X-ray Scattering
Authors: Yang, XS
Yuan, LX
Peterson, VK
Minett, AI
Zhao, M
Kirby, N
Mudie, S
Harris, AT
Keywords: CATALYSTS
FILMS
WATER
MEMBRANES
DENSITY
NUCLEATION
Issue Date: 24-Apr-2013
Publisher: Americal Chemical Society
Citation: Yang, X. S., Yuan, L. X., Peterson, V. K., Minett, A. I., Zhao, M., Kirby, N., Mudie, S., & Harris, A. T. (2013). Pretreatment Control of Carbon Nanotube Array Growth for Gas Separation: Alignment and Growth Studied Using Microscopy and Small-Angle X-ray Scattering. ACS Applied Materials & Interfaces, 5 (8), 3063-3070.
Abstract: Aligned multiwalled carbon nanotube (CNT) arrays were prepared using chemical vapor deposition of C2H4 on Fe catalyst at 750 degrees C. CNT array height and alignment depends strongly on the duration of H-2 pretreatment, with optimal height and alignment achieved using 10-15 min pretreatment. Small-angle X-ray scattering (SAXS) was used to quantify the alignment, distribution, and size of the CNTs in arrays produced from varying pretreatment times and the results correlated with microscopy measurements. SAXS analysis revealed that the higher section of the CNT arrays exhibited better alignment than the lower section. Combining these insights with transmission electron microscopy measurements of the CNT defects within each array enable a mechanism for the CNT growth to be proposed, where the loss of alignment arises from deformation of the CNTs during their growth. Gas permeation test across densified CNT arrays indicated that the alignment of the CNT array plays an important role in the gas transport, and that the gas diffusion across the well-aligned CNT arrays was enhanced by a factor of 45, which is much more than that across the poorly aligned CNT arrays, with an enhancement factor of similar to 8. © 2013, American Chemical Society.
URI: http://dx.doi.org/10.1021/am3032579
http://apo.ansto.gov.au/dspace/handle/10238/4900
ISSN: 1944-8244
Appears in Collections:Journal Articles

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