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Issue 38, 2014
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Investigation on field emission properties of graphene–carbon nanotube composites

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Abstract

The aim of this article is to provide a systematic evaluation to investigate the characteristics of the field emission properties of graphene–carbon nanotube composites. A model of graphene–carbon nanotube composites is established, and the C–C bond length, binding energy, energy level, ionization potential and work function are calculated by a first principles method. The results show that the composite structure formed by a combination of graphene and carbon nanotubes has higher stability and better semiconductor properties. When an electric field is applied, the orbital energy of the composite material increases and the band gap reveals a downward trend, which has a positive effect on the improvement of the field emission properties. With an increase in the electric field, the work functions and ionization potentials descend and the Mulliken charge moves effectively, which further shows that graphene–carbon nanotube composites have excellent characteristics and potential in field emission. The local electron density distribution also shows some changes. Our study is helpful to expand the application of graphene and carbon nanotubes, as well as provide a theoretical reference for the design of new field emission devices.

Graphical abstract: Investigation on field emission properties of graphene–carbon nanotube composites

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Article information


Submitted
10 Jan 2014
Accepted
05 Mar 2014
First published
29 Apr 2014

RSC Adv., 2014,4, 19622-19628
Article type
Paper

Investigation on field emission properties of graphene–carbon nanotube composites

J. Gong and P. Yang, RSC Adv., 2014, 4, 19622
DOI: 10.1039/C4RA00248B

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