Effect of hydrogenation on the microwave absorption properties of BaTiO₃ nanoparticles

Abstract

Microwave absorbing materials (MAMs) have numerous important applications in electronic communications, signal protection, radar dodging, etc. Although it has been proposed as a promising MAM, BaTiO 3 has a high reflection coefficient at the interface with air, causing a large reflection. Thus, its efficiency of microwave absorption is not satisfactory. Here, we report that hydrogenation has largely improved the microwave absorption of BaTiO 3 nanoparticles. Hydrogenation is performed on BaTiO 3 nanoparticles by treating pristine BaTiO 3 nanoparticles at 700 C for 4 hours in a pure H 2 environment.The enhanced microwave absorption efficiency with a reflection loss value (À36.9 dB) is attributed to the increased resonance of polar rotations with the incident electromagnetic field which is amplified by the increased interfacial polarization caused by the built-in electrical field along the boundaries between different grains created within these nanoparticles.

Preparation of boron nitride nanosheet-coated carbon fibres and their enhanced antioxidant and microwave-absorbing properties

“…A material with an RL value less than À20 dB is an excellent absorber because this value corresponds to a microwave absorption of 99.99%. 34 Therefore, we conclude that the microwave-absorbing property of carbon bres can be signicantly enhanced by BN coating through the reduction of microwave reection.…”

“…To further describe the microwave-absorbing property of the samples, the reection loss (RL) of the carbon bres with and without BN coating was calculated in accordance with the following equations by using the single-layer model: 33,34 RLðdBÞ ¼ 20 log 10…”

Synthesis, properties, and applications of black titanium dioxide nanomaterials

“…Dong et al [159] also observed strong microwave absorption in anodized TiO 2, due to the interfacial electric field formed at the boundary of crystalline-amorphous phases. Tian et al [160] reported the good microwave absorption in hydrogenated BaTiO 3 , due to the increased resonance of polar rotations with the incident electromagnetic field. The mechanism of the strong microwave absorption in black TiO 2 nanocrystals was investigated by Li et al [161].…”

Facile fabrication of carbon microspheres decorated with B(OH)3 and α-Fe2O3 nanoparticles: Superior microwave absorption

“…As shown in Fig. 6 [48]. Therefore, these novel 3D B(OH) 3 /α-Fe 2 O 3 -CMSs are promising candidate for practical applications.…”