Controlled synthesis of a large fraction of metallic single-walled carbon nanotube and semiconducting carbon nanowire networks

Han, Z.J., Yick, S., Levchenko, I., Tam, E., Yajadda, M.M.A., Kumar, S., Martin, P.J., Furman, S., & Ostrikov, K. (2011) Controlled synthesis of a large fraction of metallic single-walled carbon nanotube and semiconducting carbon nanowire networks. Nanoscale, 3(8), pp. 3214-3220.

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Controlled synthesis of both single-walled carbon nanotube and carbon nanowire networks using the same CVD reactor and Fe/Al2O3 catalyst by slightly altering the hydrogenation and temperature conditions is demonstrated. Structural, bonding and electrical characterization using SEM, TEM, Raman spectroscopy, and temperature-dependent resistivity measurements suggest that the nanotubes are of a high quality and a large fraction (well above the common 33% and possibly up to 75%) of them are metallic. On the other hand, the carbon nanowires are amorphous and semiconducting and feature a controlled sp2/sp3 ratio. The growth mechanism which is based on the catalyst nanoisland analysis by AFM and takes into account the hydrogenation and temperature control effects explains the observed switch-over of the nanostructure growth modes. These results are important to achieve the ultimate control of chirality, structure, and conductivity of one-dimensional all-carbon networks.

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22 citations in Scopus
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20 citations in Web of Science®

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ID Code: 73751
Item Type: Journal Article
Refereed: Yes
DOI: 10.1039/c1nr10327j
ISSN: 2040-3372
Divisions: Current > QUT Faculties and Divisions > Science & Engineering Faculty
Copyright Owner: Copyright 2011 Royal Society of Chemistry
Deposited On: 10 Jul 2014 05:00
Last Modified: 11 Jul 2014 03:01

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