A tubular furnace with an alumina tube was used for the oxidation of the carbon fibers to observe different weight loss behaviors via surface oxidation due to the different morphologies of the fibers. The electrical resistivity of the carbon fibers was measured using a Loresta GP resistivity meter (MCP-T610, Mitsubishi Chemical Co., Kanagawa, Japan) connected with a four-point-probe (MCP-TP03P, Mitsubishi Chemical Co., Kanagawa, Japan). The microstructural property was analyzed using Raman spectroscopy (LabRAM HR800, Horiba, Co., Kyoto, Japan) and XRD (X’pert pro Powder, Malvern PANalytical., Eindhoven, Netherlands). The samples were cut using a focused ion beam (FIB, JIB-4601F, JEOL, Co., Tokyo, Japan). In order to prepare the TEM sample, the carbon fibers were molded into an epoxy resin. Co., Suwon, Korea), XPS (PHI 5000 Versa Probes II, ULVAC-PHI, Inc., Kanagawa, Japan), and TEM (JEM-2010, JEOL, Co., Tokyo, Japan). The surface structure and functional groups of the fibers were analyzed using SEM (S-4700, Hitachi, Tokyo, Japan), AFM (XE-70, Park systems. The morphology change and surface properties of the CFs with addition of graphene were observed using scanning electron microscopy (SEM), transmission electron microscopy (TEM), atomic force microscopy (AFM), X-ray photoelectron spectroscopy (XPS), Raman spectroscopy, and X-ray diffraction analysis (XRD) the thermal and electrical properties were also characterized. Various contents of graphene were added to the pitch during the synthesis step to observe the effects of graphene content on the morphology of the CFs. In this study, graphene-dispersed isotropic pitch was synthesized, and CF was prepared using it. However, the present works focus on the properties of graphene/polymer composite fibers or electrical properties of graphene/pitch based porous materials there has been no report on surface morphology change of graphene-dispersed isotropic pitch-based fiber. Such composites form different anisotropic structures depending on the content of graphene. have studied the co-carbonization behavior of petroleum pitch/graphene oxides. These composites exhibit a high specific capacitance, good rate performance, and excellent cycle stability due to the good electrical properties that result from the addition of the proper content of graphene. have made microporous carbon/graphene composites using coal tar pitch and graphene oxide via KOH activation. In the aspect of energy storage applications, He et al. These composite fibers usually exhibit enhanced mechanical, thermal, conductive, and antibacterial properties. have reviewed graphene/polymer composite fibers. From the point of view of mechanical applications, Ji et al. Recently, a variety of studies to combine graphene and other materials are underway in attempts to unlock synergetic effects of two materials. Graphene has become one of the most important nanomaterials, and many researchers have been continuing various studies using it in various fields. Isotropic pitch-based CFs are widely used for general performance applications because isotropic pitch is easy to spin, and its physicochemical properties can be easily controlled during the carbonization process. The pitch-based CFs can be further classified into two types: isotropic pitch and anisotropic (or mesophase) pitch. Commercial production has been achieved from only three kinds of precursors: PAN, rayon, and pitches. Carbon fiber is considered a useful reinforcement for composites due to its excellent properties, such as its high modulus, dimensional stability, and excellent thermal and electrical conductivities. Carbon fiber (CF) can be prepared from various precursors, such as gases (benzene, ethane, and methane ), polymers (cellulose (rayon), polyacrylonitrile (PAN), polyvinylchloride, and phenol resin ), and pitches (isotropic and mesophase pitch).
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