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Effects of metal underlayer grain size on carbon nanotube growth
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Burt, David P., Whyte, W. Murray, Weaver, J. M. R., Glidle, Andrew, Edgeworth, Jonathan P., Macpherson, Julie V. and Dobson, Phillip S. (2009) Effects of metal underlayer grain size on carbon nanotube growth. The Journal of Physical Chemistry Part C: Nanomaterials, Interfaces and Hard Matter, Vol.113 (No.34). pp. 15133-15139. doi:10.1021/jp902117g ISSN 1932-7447.
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Official URL: http://dx.doi.org/10.1021/jp902117g
Abstract
In this paper we demonstrate that the nucleation density of single-walled carbon nanotubes (SWNTs), formed by thermal catalytic chemical vapor deposition, strongly depends on the grain size of Al underlayers covered with a native oxide (Al/Al2O3). By varying the Substrate temperature during Al sputter deposition it was possible to investigate the effect of Al grain size on growth without inducing changes in the underlayer thickness, surface chemistry, or any other growth parameter. The resulting SWNT growth structures ranged from low-density 2D nanotube networks that lay across the surface of the substrate to high density 3D nucleation which gave rise to vertical "forest" growth. The height of the SWNT "forest" was observed to increase with increasing Al deposition temperature as follows, 200 > 100 > 60 > 20 degrees C on Si/Al but in the order 100 > 200 > 60 > 20 degrees C on SiO2/Al substrates for fixed growth conditions. The differences in the SWNT growth trends on Si and SiO2 substrates are believed to be due to the existence of an optimal Al/Al2O3 underlayer grain size for the formation of active catalytic nanoparticles, with larger Al/Al2O3 grains forming on SiO2 than Si at a fixed substrate temperature. Numerous surface analysis techniques including AFM, XPS, FESEM, TEM, and Raman spectroscopy have been employed to ascertain that the observed changes in nanotube growth for this system are related primarily to changes in underlayer morphology.
Item Type: | Journal Article | ||||
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Subjects: | Q Science > QD Chemistry T Technology > TA Engineering (General). Civil engineering (General) |
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Divisions: | Faculty of Science, Engineering and Medicine > Science > Chemistry | ||||
Library of Congress Subject Headings (LCSH): | Chemical vapor deposition, Catalyst poisoning, Nanotubes, Carbon | ||||
Journal or Publication Title: | The Journal of Physical Chemistry Part C: Nanomaterials, Interfaces and Hard Matter | ||||
Publisher: | American Chemical Society | ||||
ISSN: | 1932-7447 | ||||
Official Date: | 27 August 2009 | ||||
Dates: |
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Volume: | Vol.113 | ||||
Number: | No.34 | ||||
Number of Pages: | 7 | ||||
Page Range: | pp. 15133-15139 | ||||
DOI: | 10.1021/jp902117g | ||||
Status: | Peer Reviewed | ||||
Publication Status: | Published | ||||
Access rights to Published version: | Restricted or Subscription Access | ||||
Funder: | Engineering and Physical Sciences Research Council (EPSRC) | ||||
Grant number: | EP/C518276/1 (EPSRC), EP/E025722/1 (EPSRC) |
Data sourced from Thomson Reuters' Web of Knowledge
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