PEDOT:PSS-patched magnetic graphene films with tunable dielectric genes for electromagnetic interference shielding and infrared stealth.

• The PEDOT:PSS-patched magnetic graphene films are successfully fabricated by vacuum-assisted molecular patching engineering. • The dielectric genes inside composites are visually revealed, laying a solid foundation for regulating electromagnetic response. • The PEDOT:PSS-patched magnetic graphene films demonstrate tunable green EMI shielding and infrared stealth functions. • The EMI shielding and infrared stealth mechanisms are reasonably discussed. The intelligent era brings electronics closer to humans, but also produces a large scale of electromagnetic (EM) radiation simultaneously, which causes serious harm to health and high sophisticated equipment. Exploring the underlying response logic of EM materials is urgently needed to face the challenge of EM interference (EMI) and secondary EM pollution better. Herein, PEDOT:PSS-patched magnetic graphene films are fabricated by vacuum-assisted molecular patching engineering, with tunable EM wave response. Based on the observation of micro-nano structure, the dielectric genes are visually revealed, which offers a bran-new horizon for the optimization of EM properties. Impressively, the constructed films achieve double band shielding toward gigahertz wave and infrared radiation. The optimal EMI shielding efficiency exceeds 99 %, and covers the entire X-band. Meanwhile, the green shielding index rises from 0.3 to 0.6, indicating that it is a potential green EMI shielding materials. Furthermore, the periodic macroscopic interfaces and the inherent thermal anisotropy endow the films with thermal insulation and flexible infrared stealth functions in simulated thermal environments. This work refreshes the insight into multi-band shielding, providing a new idea to EM energy governance. [Display omitted] [ABSTRACT FROM AUTHOR]