Electrical property of graphene-coated carbon fiber by self-assembly and thermal-reduction

Abstract

To improve the electrical properties of carbon fiber (Cf), the fiber surface was carboxylated with nitric acid, aminated with ethylenediamine, and coated with graphene oxide (GO) through self-assembly. The GO-coated Cf was reduced by heat treatment in a temperature range of 500 to 1300 °C. For structural analysis of the reduced GO (rGO), HRTEM, XRD, and Raman spectroscopy were performed, and an I-V curve was obtained to visualize the electrical property. As the heat treatment temperature increased, the crystallinity increased, and the ID/G at 900 degrees was 1.3067, which is the highest value in Raman spectroscopy. The I-V curve reached its highest point at 700 °C and lowest point at 900 °C. This confirmed that the difference in properties at the two temperatures originated from the number of vacancy defects present in the coated rGO. Our experiment confirmed that vacancy defects were more fatal than the oxygen-related functional groups present in GO in terms of electrical properties. ？ 2021 Elsevier B.V.