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Field emission properties of tapered carbon nanotubes synthesized by the pyrolysis of poly(ethylene glycol) using a nickel catalyst
- Source :
-
Diamond & Related Materials . Feb2012, Vol. 22, p124-127. 4p. - Publication Year :
- 2012
-
Abstract
- Abstract: The synthesis of tapered carbon nanotubes (TCNTs) by the thermal decomposition of poly(ethylene glycol) at 800°C using Ni as a catalyst is reported. The TCNTs consist of a 50nm diameter graphite tube terminated by a tapered tip, which is about 1μm in length and 20nm in diameter in the tip end. The catalyst particle contained in the tapered tip was found to be a cylindrical with a diameter of about 20nm. Electron microscopy revealed that the catalyst was a single crystal of NiCx and the graphene layers were grown in the [110] direction of the catalyst, forming TCNTs. The unique morphology of the catalyst particle played an important role in the formation of TCNTs. The field emission properties of the TCNTs exhibited a lower turn-on voltage (Eturn-on =3.2V/μm), lower threshold fields voltage (Ethreshold =5.2V/μm) and higher field-enhancement factor β than did multi-walled CNTs. [Copyright &y& Elsevier]
Details
- Language :
- English
- ISSN :
- 09259635
- Volume :
- 22
- Database :
- Academic Search Index
- Journal :
- Diamond & Related Materials
- Publication Type :
- Academic Journal
- Accession number :
- 71804595
- Full Text :
- https://doi.org/10.1016/j.diamond.2011.12.036