Electric heating films based on m-aramid nanocomposites containing hybrid fillers of graphene and carbon nanotube

摘要

m-Aramid nanocomposite films containing 1.0 wt% hybrid fillers of different compositions of graphene and multi-walled carbon nanotube (MWCNT) are prepared by an efficient solution-casting method, and their electric heating behavior is investigated as a function of the composition of hybrid fillers. Electron microscope images and X-ray diffraction patterns reveal that the hybrid fillers are well dispersed in the m-aramid matrix by forming interconnected networks among graphene sheets and MWCNTs. The electrical resistivity of the nanocomposite films is decreased gradually from ~10~5 to 10 ~1 Ω cm with increasing the MWCNT content in the hybrid fillers. Accordingly, maximum temperature attained at a given applied voltage for the nanocomposite films can be finely controlled by the graphene/MWCNT composition of 1.0 wt% hybrid fillers. The m-aramid/hybrid filler nanocomposite films also exhibit excellent electric heating performance in aspects of rapid temperature response and high electric power efficiency at applied voltages of 1-100 V.