Preparation of B and N Co-Doped Carbon Micro-Nanostructures Using Waste Coconut Wood and Their Electromagnetic Wave Absorption Properties
;5G communication technology provides great convenience for social development and daily life,but it also brings serious electromagnetic wave pollution.To mitigate the harm caused by this pollution,designing lightweight and eco-friendly broadband electromagnetic wave absorbing materials has become a research focus.In this paper,a B and N co-doped carbon material with bamboo-like one-dimensional hollow tubular structure is prepared using coconut wood as precursor.B and N co-doping optimizes the composition of biomass-derived carbon and improves the impedance matching of the material.The bamboo-like one-dimensional hollow tubular structure is conducive to the entry of electromagnetic waves into the material.Consequently,the prepared material exhibits remarkable electromagnetic wave absorption properties,with the lowest reflection loss(RL)value of-59.64 dB at 14.12 GHz,an effective absorption bandwidth(EAB)width range of 5.88 GHz,and a required thickness of only 2.1 mm.Research results demonstrate that the excellent electromagnetic wave absorption performance of this material stems from a combination of multiple refractions and scattering within the material,dipolar polarization,interfacial polarization,and conductive polarization.
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