Thermostable SiCO@BN sheets with enhanced electromagnetic wave absorption

Defect‐Engineered Graphene/Si3N4Multilayer Alternating Core‐Shell Nanowire Membrane: A Plainified Hybrid for Broadband Electromagnetic Wave Absorption

“…The EAB of C2 slightly declines after oxidation at 1000 °C for 1 h, and the EAB retention ratio (the ratio of the EAB after oxidation to the EAB before oxidation) of C2 is 93%. Compared with the performance of other ceramic absorption materials [21,[63][64][65][66] (Figure 7c), C2 achieves significantly better oxidation resistance and demonstrates a higher EAB retention ratio. Therefore, the unique structure of alternating DG cores and Si 3 N 4 shells shows great promise for enabling high-temperature EMW absorption.…”

Facile preparation of a cellulose derived carbon/BN composite aerogel for superior electromagnetic wave absorption

“…2a, the typical absorption peaks of the cellulose backbone, including the stretching vibration of O–H at 3340 cm −1 , stretching vibration of C–H at 2873 cm −1 , and the asymmetric stretching of C–O–C at 1204 cm −1 , are clearly observed for CA. 22 After hybridizing with BN, two new peaks at 1377 and 785 cm −1 corresponding to B–N stretching vibrations and B–N–B bending are clearly observed for CA/BN10, 19,23 and the O–H, C–H and C–O–C peaks of cellulose also displays an obvious blue shift, suggesting the formation of hydrogen bonding between cellulose and BN. 24 As for the CCA/BN10-680, only the characteristic peaks of BN can be seen, and all the peaks of cellulose almost disappear completely, verifying the successful carbonization of cellulose.…”

“…18 More importantly, the high resistivity of BN allows it to be used as a wave-transmitting material to control the dielectric properties of materials, achieving optimized impedance matching and enhanced interface polarization. 19 For instance, Hou et al have synthesized SiCO@BN with a core–shell structure as an EMW absorber, which exhibited an RL min of −55.6 dB and a wide EAB of 5.9 GHz. 20 Thus, the hybridization of carbon-based materials and BN is a promising strategy for preparing high-performance ideal EMW absorbers.…”

Recent advances in precursor-derived ceramics integrated with two-dimensional materials

“…In addition, the broadest effective bandwidth (EBW) of the materials was found to be almost 6.0 GHz, achieved at a thickness of 2.5 mm. 102 SiBCN–rGO (6 wt%) composites prepared via annealing at 1300 °C have been shown to exhibit an amorphous SiBCN matrix integrated with a crosslinked network-like conductive rGO phase, with a third semiconductor β-SiC phase adjacent to carbon clusters. The RL min value of this composite was −62.71 dB, which was achieved at a thickness of 2.17 mm.…”