| Abstract:Amphiphilic modified carbon fibers were prepared via ozone oxidation coupled with an esterification reaction. The effects of oxidation time and n-octanol content on the surface structure and chemical properties of carbon fibers were systematically investigated using SEM, XPS, and FT-IR characterization techniques. Carbon papers were subsequently fabricated using the modified fibers as precursors, and their performance was comprehensively evaluated. The results indicate that amphiphilic modification maintains uniform fiber dispersion while effectively enhancing the interfacial bonding strength between carbon fibers and resin. Under the optimal conditions of 45 min oxidation time and 80% n-octanol content, the resulting carbon paper exhibited a thickness of 197 μm, an in-plane electrical resistivity of 12.2 mΩ·cm, and an air permeability of 228.9 mL·mm/(cm²·h·Pa). Notably, the tensile strength reached 26.2 MPa, representing a 28.5% improvement compared with carbon paper prepared using solely hydrophilic modification. |