Novel 3D microsheets contain cobalt particles and numerous interlaced carbon nanotubes for high-performance electromagnetic wave absorption

The 3D microsheets contain cobalt particles and numerous interlaced carbon nanotubes (denoted as Co-NCNTs) with different pyrolysis temperature (700 °C, 800 °C and 900 °C) were successfully fabricated by a novel solution phase method. That is, polyolized the prepared g-C₃N₄ to form a g-C₃N₄@Co-glycolate hybrid precursor microsheets, which was then subjected to pyrolysis treatment under an inert gas. The effects of pyrolysis temperature in the range of 700°C–900 °C on the microwave absorption properties of the Co-NCNTs were investigated in detail. As an absorber, Co-NCNTs with the pyrolysis temperature of 800 °C exhibit superior electromagnetic wave absorption properties with the optimal reflection loss (R_L) value of −46 dB in the thickness of 2.5 mm, wide effective bandwidth (R_L ≤ −10 dB) of 7.2 GHz. This excellent performance attributed to the special microsheet structures, uniform Co particle distribution and the better impedance matching.