Facile synthesis of La2O3/Co@N-doped carbon nanotubes via Prussian blue analogues toward strong microwave absorption

Prussian blue, a member of the metal-organic frameworks (MOFs), has attracted great interest in electromagnetic wave absorption due to its unique properties, such as multiple morphologies and tunable structures. In this paper, La 2 O 3 /Co@N-doped carbon nanotubes (La 2 O 3 /Co@NCNTs) composites were synthesized by thermal annealing La[Co(CN) 6 ]·5H 2 O Prussian blue analogue (LaCo-PBA) precursors under an Argon (Ar) atmosphere. The studies of electromagnetic wave absorption show that La 2 O 3 /Co@NCNTs demonstrated the minimum reflection loss (RL) of −53.40 dB with the effective absorption bandwidth (EAB) of 4.34 GHz at the thickness of 2.45 mm. These excellent microwave absorption properties are attributed to multiple loss mechanisms, including conduction loss , polarization loss, magnetic resonance loss, and eddy current loss . This study offers a new possibility for the design of multifaceted lightweight carbon-based microwave absorbing materials.