Diameter control of single wall carbon nanotubes synthesized using chemical vapor deposition

Roy, Soumyenda, Bajpai, Reeti, Soin, Navneet ORCID: 0000-0002-0196-2071, Roy, Susanta S., McLaughlin, J.A. and Misra, D.S. (2014) Diameter control of single wall carbon nanotubes synthesized using chemical vapor deposition. Applied Surface Science, 321. pp. 70-79. ISSN 0169-4332

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Lack of control on the chirality or diameter of single-wall carbon nanotubes (SWCNTs) during synthesis is a major impediment in the path of their widespread commercialization. We demonstrate that the humble technique of catalytic chemical vapor deposition of methane, without any sophisticated catalyst preparation, can provide significant control on the diameter of the synthesized SWCNTs. The catalyst used is a solid solution of the bimetals Fe-Mo or Co-Mo in MgO. The radial breathing modes (RBMs)in the Raman spectra of SWCNTs were used to find out the diameters. Kataura plot along with RBMs was used to study the chirality of the tubes. High concentration of the catalysts (Co:Mo:MgO = 1:0.5:15and Fe:Mo:MgO = 1:0.5:30) resulted in high yields. However, most of these carbonaceous materials were impurities. Reducing the concentration not only improved the purity and crystallinity (ID/IGratio ∼0.1),but most importantly reduced the diameter spread of the SWCNTs. Majority of the SWCNTs grown using the low concentration catalysts (Co:Mo:MgO = 1:0.5:300 and Fe:Mo:MgO = 1:0.5:200) were estimated to have diameters lying between 1.13 and 1.65 nm. This narrowing of diameter spread happened for both Fe and Co catalyst systems and depended only on the concentration of the catalyst.

Item Type: Article
Uncontrolled Keywords: Carbon nanotube, Single wall carbon nanotube, Chemical vapor deposition, Chirality, Controlled synthesis, Raman spectroscopy
Divisions: University of Bolton Research Centres > Institute for Materials Research and Innovation
Depositing User: Tracey Gill
Date Deposited: 28 Jun 2016 10:39
Last Modified: 28 Mar 2018 09:23
Identification Number: 10.1016/j.apsusc.2014.09.171
URI: http://ubir.bolton.ac.uk/id/eprint/904

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