Confronted with microwave pollution issues, there is an urgent need for microwave absorption materials that possess optimal combinations of dielectric loss and magnetic loss properties. While a variety of studies focus on the components, the construction of nanostructure is rarely studied, which is of equivalent significance to microwave absorber design. In this work, Co-ZIF-67 was adopted as self-template to grow N-doped graphene/carbon nanotube interlinked conductive networks in-situ under a one-step carbonization process with tailored microwave absorption properties. Diverse microwave absorption performance could be achieved by directly adjusting the proportions among ingredients and the calcination temperature, obtaining a maximum value of reflection loss of −65.45 dB at 17.5 GHz with a sample thickness of just 1.5 mm. The effective absorption bandwidth could be tailored from 3.75 to 18 GHz among different thickness as required. The nanostructures had an apparent impact on the corresponding microwave absorption performance, in which the N-doped carbon-based conductive networks, ferromagnetic cobalt atoms, and interfaces among heterostructure strengthened the dipolar polarization and conductivity loss, magnetic loss, and interfacial polarization, respectively. This synthesis strategy offers a promising pathway for integrating nanostructures and functions, catering to requirements for designing and optimizing prospective microwave absorbers.
Bibliographical noteFunding Information:
Hua Li is thankful for the support from the National Natural Science Foundation of China (No. U1733130 and 81772432 ); Basic Research Field of Shanghai Science and Technology Innovation Program (No.16JC1401500); Science and Technology Innovation Special Zone Program (No.18-163-13-ZT-008-003-06); CALT Foundation; Cross Research Fund of Biomedical Engineering of Shanghai Jiao Tong University ( YG2016MS70 , YG2017MS11 ); and Joint Foundation from the Ministry of Education of China ( 6141A02022264 ). Yujie Chen is thankful for the support from the NSFC (No. 11674218 ). Author 1 and Author 2 contributed equally to this work.
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- Graphene/carbon nanotube conductive networks
- Impedance match
- Interfacial polarization
- Microwave absorption
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Surfaces, Coatings and Films
- Colloid and Surface Chemistry