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 degrees C, 800 degrees C and 900 degrees 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 degrees C-900 degrees 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 degrees 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. (C) 2019 Elsevier B.V. All rights reserved.