MWCNTs/SiO2Composite System: Carrier Transmission, Twin-Percolation and Dielectric Properties

We synthesize composite systems of multi-wall carbon nanotubes (MWCNTs)/SiO 2 by using the sol-gel method. The dielectric properties of the systems with different-concentration MWCNTs are studied. In our MWCNTs/SiO 2 inorganic systems, the twin-percolation phenomenon exists when the concentrations of MWCNTs are 5–10% and 15–20%. The permittivity and conductivity have jumping changes. The twin-percolation phenomenon is attributed to the special transfer mechanism of MWCNTs in the system, determined by hopping and migrating electrons. Variations of dielectric properties and conductance of the MWCNTs/SiO 2 systems are conformed to the percolation theory. The special percolation phenomenon and electric properties of MWCNTs/SiO 2 can help us comprehend the conductivity mechanism of the MWCNTs/SiO 2 systems effectively, and promote the development of a high performance function composite system.