Investigation of the effect of heat treatment on the inductive effect of GO membrane during the ion diffusion process

Abstract The inductive effect of 2D material in an aqueous solution can be potentially applied in biological implantable electronic devices. In this paper, graphene oxide (GO) membranes were prepared via the vacuum filtration method and then treated under different heat temperatures. X‐ray diffraction and scanning electron microscopy results showed the shrinkage of the interlayer spacing in the GO membrane, while Fourier transform infrared results indicated the loss of oxygen‐containing polar groups during the heat treatment. EIS results confirmed the inductive signal of the GO membrane appeared during the ion diffusion process. And the inductive effect can be controlled by the polar groups and the interlayer spacing in the GO membrane. Moreover, at lower electrolyte concentrations (0.0100 mol/L), more polar groups lead to a stronger inductive signal, while at higher electrolyte concentrations (0.10 mol/L), narrower interlayer spacing results in a stronger inductive signal. The investigation may provide a key clue to tune the inductance of the biological electronic device based on GO.