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Controlling the catalyst during carbon nanotube growth.

Robertson, J and Hofmann, S and Cantoro, M and Parvez, A and Ducati, C and Zhong, G and Sharma, R and Mattevi, C (2008) Controlling the catalyst during carbon nanotube growth. In: UNSPECIFIED pp. 6105-6111..

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Abstract

We have recently been able to grow single-walled carbon nanotubes by purely thermal chemical vapour deposition (CVD) at temperatures as low as 400 degrees C. This has been achieved by separating the catalyst pre-treatment step from the growth step. In the pre-treatment step, a thin film catalyst is re-arranged into a series of nano-droplets, which are then the active catalysts. Both steps have been studied by in-situ environmental transmission electron microscopy and X-ray photoemission spectroscopy. We have also studied the catalyst yield, the weight of nanotubes grown per weight of transition metal catalyst. Using very thin layers of Fe on Al2O3 support in a remote plasma-assisted CVD, we have achieved yields of order 100,000. This may be due to control of catalyst poisoning by ensuring an etching path.

Item Type: Conference or Workshop Item (UNSPECIFIED)
Uncontrolled Keywords: Catalysis Crystallization Macromolecular Substances Materials Testing Molecular Conformation Nanotechnology Nanotubes, Carbon Particle Size Surface Properties
Subjects: UNSPECIFIED
Divisions: Div B > Solid State Electronics and Nanoscale Science
Div B > Electronic Devices & Materials
Depositing User: Cron Job
Date Deposited: 07 Mar 2014 11:23
Last Modified: 05 May 2014 01:10
DOI:

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