Structure- and composition-dependent electron field emission from nitrogenated carbon nanotips

Wang, B.B., Ostrikov, K., Gong, C.S., Xie, E.Q., & Wang, R.Z. (2012) Structure- and composition-dependent electron field emission from nitrogenated carbon nanotips. Journal of Applied Physics, 112(8), 084304.

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Abstract

The electron field emission (EFE) properties of nitrogenated carbon nanotips (NCNTPs) were studied under high-vacuum conditions. The NCNTPs were prepared in a plasma-assisted hot filament chemical vapor deposition system using CH4 and N2 as the carbon and nitrogen sources, respectively. The work functions of NCNTPs were measured using x-ray photoelectron spectroscopy. The morphological and structural properties of NCNTPs were studied by field emission scanning electron microscopy, micro-Raman spectroscopy, and x-ray photoelectron spectroscopy. The field enhancement factors of NCNTPs were calculated using relevant EFE models based on the Fowler-Nordheim approximation. Analytical characterization and modeling results were used to establish the relations between the EFE properties of NCNTPs and their morphology, structure, and composition. It is shown that the EFE properties of NCNTPs can be enhanced by the reduction of oxygen termination on the surface as well as by increasing the ratio of the NCNTP height to the radius of curvature at its top. These results also suggest that a significant amount of electrons is emitted from other surface areas besides the NCNTP tops, contrary to the common belief. The outcomes of this study advance our knowledge on the electron emission properties of carbonnanomaterials and contribute to the development of the next-generation of advanced applications in the fields of micro- and opto-electronics.

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4 citations in Web of Science®

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ID Code: 73620
Item Type: Journal Article
Refereed: Yes
DOI: 10.1063/1.4759047
ISSN: 0021-8979
Divisions: Current > QUT Faculties and Divisions > Science & Engineering Faculty
Deposited On: 09 Jul 2014 03:10
Last Modified: 10 Jul 2014 04:48

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