▎ 摘　　要

Here, an innovative approach to fabricate lightweight, highly sensitive three-dimensional (3D) conductive nanofiber sponges for pressure sensors was reported. 3D sponges were prepared by self-assembly of electrospun carbon nanofibers/aminated Fe3O4 and reduced graphene oxide (rGO) nanosheets. Specifically, an external magnetic field was applied to further regulate the orientation and distribution of the graphene nanosheets through the induction of the magnetic field on the nanomagnetons to improve the performance of the sponge. After the external magnetic field conditions were changed, the prepared rGOF/CF composite sponge material showed high sensitivity (0.56 Kpa(-1)), the volume conductivity of the conductive sponge significantly improved, the conductivity measured at both ends dropped sharply by more than 30-60 times from 6154.4 Omega m. The rGOF/CF composite sponge has certain magnetic properties. It could be applied to the switch of magnetic attraction. Meanwhile, the composite sponge material exhibited good cyclic stability under different pressure compressions and an obvious response to small pressures.