Carbon materials with quasi-graphene layers: the dielectric, percolation properties and the electronic transport mechanism

doi:10.1088/1674-1056/22/3/037701

Abstract We investigate the dielectric properties of multi-walled carbon nanotubes (MWCNTs) and graphite filling in SiO₂ with the filling concentration of 2–20 wt.% in the frequency range of 10²–10⁷ Hz. MWCNTs and graphite have general electrical properties and percolation phenomena owing to their quasi-structure made up of graphene layers. Both permittivity ε and conductivity σ exhibit jumps around the percolation threshold. Variations of dielectric properties of the composites are in agreement with the percolation theory. All the percolation phenomena are determined by hopping and migrating electrons, which are attributed to the special electronic transport mechanism of the fillers in the composites. However, the twin-percolation phenomenon exists when the concentration of MWCNTs is between 5–10 wt.% and 15–20 wt.% in the MWCNTs/SiO₂ composites, while in the graphite/SiO₂ composites, there is only one percolation phenomenon in the graphite concentration of 10–15 wt.%. The unique twin-percolation phenomenon of MWCNTs/SiO₂ is described and attributed to the electronic transfer mechanism, especially the network effect of MWCNTs in the composites. The formation of network plays an essential role in determining the second percolation threshold of MWCNTs/SiO₂.

Keywords: multi-walled carbon nanotube quasi-graphene layer dielectric properties percolation

Received: 12 July 2012
Revised: 05 September 2012
Accepted manuscript online:

PACS:	77.22.Ch	(Permittivity (dielectric function))
	73.23.-b	(Electronic transport in mesoscopic systems)
	72.80.Tm	(Composite materials)
	72.20.Ee	(Mobility edges; hopping transport)

Fund: Project supported by the National Natural Science Foundation of China (Grant Nos. 50972014, 51072024, and 51132002).

Corresponding Authors: Yuan Jie
E-mail: yuanjie4000@163.com

Cite this article:

Lu Ming-Ming (卢明明), Yuan Jie (袁杰), Wen Bo (温博), Liu Jia (刘甲), Cao Wen-Qiang (曹文强), Cao Mao-Sheng (曹茂盛) Carbon materials with quasi-graphene layers: the dielectric, percolation properties and the electronic transport mechanism 2013 Chin. Phys. B 22 037701

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