Abstract
It is of great significance to regulate the dielectric parameters and microstructure of carbon materials by elemental doping in pursuing microwave absorption (MA) materials of high performance. In this work, the surface electronic structure of N-doped CNTs was tuned by boron doping, in which the MA performance of CNTs was improved under the synergistic action of B and N atoms. The B,N-doped carbon nanotubes (B,N-CNTs) exhibited excellent MA performance, where the value of minimum reflection loss was −40.04 dB, and the efficient absorption bandwidth reached 4.9 GHz (10.5–15.4 GHz). Appropriate conductance loss and multi-polarization loss provide the main contribution to the MA of B,N-CNTs. This study provides a novel method for the design of CNTs related MA materials.
Highlights
The rapid development of electronic technology has brought great convenience to people, but the electromagnetic interference and electromagnetic pollution brought along with it seriously endanger the life and health of humans [1,2,3,4,5]
B, N-doped nanotubes were prepared, a one-step situ of the mainly carbon consisted of conductance loss andusing polarization loss.inWhen synthesis method and searched the carbon nanotubes (CNTs), microwave absorption (MA) performance
The MA performance and electrical conductivity display an upward trend followed by a downward trend with an increase in B, while the impedance matching was just the opposite
Summary
The rapid development of electronic technology has brought great convenience to people, but the electromagnetic interference and electromagnetic pollution brought along with it seriously endanger the life and health of humans [1,2,3,4,5]. The synergistic effect of the co-doping of B and N atoms on the MA performance of CNTs needs to be further investigated Inspired by these advantages, the dielectric parameters of MA materials are tuned by doping B atoms to regulate the surface electronic structure of N-doped CNTs. Recently, it has been found that melamine can effectively synthesize CNTs [34]. N-doped CNTs were one-step synthesized in situ by high-temperature pyrolysis using melamine as a carbon source In this process, a proper amount of boric acid was added in order to achieve effective doping of B atoms. When the B,N-CNTs were evaluated as absorbers, they showed high MA performance, in which the lowest reflection loss value of MA material reached −40.04 dB and the effective absorption bandwidth exceeding −10. B,N-CNTs with lightweight and good MA performance could be an effective candidate material for absorbers applications
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