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Chin. Phys. B, 2013, Vol. 22(3): 037701    DOI: 10.1088/1674-1056/22/3/037701

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

Lu Ming-Minga, Yuan Jiea b, Wen Boa, Liu Jiaa, Cao Wen-Qiangb, Cao Mao-Shenga
a School of Material Science and Engineering, Beijing Institute of Technology, Beijing 100081, China;
b School of Information Engineering, Minzu University of China, Beijing 100081, China
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      Published:  01 February 2013
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:

Cite this article: 

Lu Ming-Ming, Yuan Jie, Wen Bo, Liu Jia, Cao Wen-Qiang, Cao Mao-Sheng 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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