Abstract: The intrinsic high conductivity of graphene(Gr) and the mechanical enhancement effect of carbon nanotubes(CNT) on the matrix provide an effective pathway for developing structural-functional integrated polyetheretherketone(PEEK) composites targeting antistatic, sensing, and electromagnetic absorption applications. By hybridizing these one-dimensional and two-dimensional nanocarbon materials to leverage their synergistic effects, the mechanical properties of the composites are enhanced and the construction of conductive networks is optimized. Utilizing NH₄⁺ bridging, graphene oxide(GO) and acidified carbon nanotubes(aCNT) were uniformly coated onto PEEK powder surfaces via electrostatic adsorption. The coating status and salt removability were investigated through SEM, FTIR, and TG analyses. The graphene-carbon nanotube/PEEK(Gr-CNT/PEEK) composite(the ratio of Gr and CNT is 5∶5), prepared through thermal treatment, chemical reduction, and compression molding, exhibited a low percolation threshold(0.8wt%) and high electrical conductivity(5.64×10^-3 S/cm), surpassing the PEEK matrix by 12 orders of magnitude. At 2wt% filler content, the conductivity reached 7×10^-3 S/cm, while at 0.3wt%, the tensile strength increased to 110 MPa, representing a 10% improvement over pure resin. Furthermore, by adjusting the hybrid carbon filler ratio, the composites demonstrated distinct sensing behaviors during cyclic stretching. When the ratio of Gr and CNT is5∶5, the composite exhibited relatively stable ΔR/R₀ with a high gauge factor(G_F).

Key words: hybrid carbon nanofillers, NH₄⁺, low percolation threshold, PEEK, conductive composites