Metal Mo and nonmetal N, S co-doped 3D flowers-like porous carbon framework for efficient electromagnetic wave absorption

The carbon-based material co-doped with metal and nonmetal can induce electron spin redistribution and polarization configuration transformation, and consequently affected the electromagnetic wave absorption (EWA) performance. To explore this effect, we masterly prepared Mo and N, S co-doped 3D flower-like porous carbon framework (Mo/N/S-PCF) by pyrolysising the modified ZIF(Zn)-L. The EWA properties of N-PC, Mo/N-PCF and Mo/N/S-PCF show a trend of gradual enhancement. In addition, the calcination temperature plays a decisive role in regulating the amount of doping, the degree of graphitization and EWA properties of Mo/N/S-PCF. When the pyrolysis temperature is 900 degrees C, the optimum reflection loss of Mo/N/S-PCF can reach -53dB only with the thickness of 1.7 mm. Excellent performance of Mo/N/S-PCF is attributed to the increased dipole polarization that caused by the Mo, N and S co-doped in the carbon skeleton.