Fabrication and Dielectric Properties of CNTs/SiO_2 Composites

摘要

Stable and disperse carbon nanotubes (CNTs) aqueous solution was prepared by using cetyltrimethylammonium bromide (C_(16)TMAB) as dispersing agent and zeta potential of CNTs solution were measured to quantitatively characterize the stability of CNTs in C_(16)TMAB aqueous solution. The CNTs /SiO_2 composites were fabricated with composite powders synthesized by rapid Sol-gel method and sintered by hot-pressing technique. The electric and dielectric properties of the composites were measured and the microstructure of CNTs and composites were investigated by Field emission scanning electron microscope (FSEM) and transmission electron microscopy (TEM). The mechanisms had been investigated to explain the effect of the CNT compositions on the electric and dielectric properties of CNTs /SiO_2 composites in this paper.