A new precursor to diversify BCN architectures with enhanced electromagnetic wave absorption

Abstract

Hexagonal BCN (h-BCN) is considered to be a promising dielectric ceramic material with a hybrid B–C–N structure and an electromagnetic wave (EMW) absorbing material with tenable properties. H-BCN bulk and microtube architectures are simultaneously synthesized by precursor pyrolysis method using BCl3, aniline (AN) and diethylenetriamine (DETA) as the raw material. By analyzing its electromagnetic parameters, the effective absorption bandwidth of the sample cracking at 900 °C with the proportion of raw materials (DETA:AN = 1:1) can be up to 7.2 GHz, and the minimum reflection loss can reach −43.6 dB at 7.92 GHz with a thickness of 3.5 mm. Moreover, the EMW absorbing property of the ceramic can be tuned by adjusting the ratio of monomers, pyrolysis temperature, and cooling rates.

BaFe12O19/graphene/polyaniline coatings for flexible fabrics with enhanced microwave absorption

“…To judge the relative values of the imaginary parts, dielectric tangent loss (tan δ σ = σ″/σ′ ) and the magnetic tangent loss (tan δ μ = μ″/μ′ ) are introduced. 39 –41…”

“…To judge the relative values of the imaginary parts, dielectric tangent loss (tan d r ¼ r 00 /r 0 ) and the magnetic tangent loss (tan d l ¼ l 00 /l 0 ) are introduced. [39][40][41] The relevant parameters are shown in Figure 5. In Figure 5(a) and (b), the r 0 of BaFe 12 O 19 remains around 3.5, while the r 00 remains around 0.14.…”

Boron carbon nitride (BCN): an emerging two-dimensional nanomaterial for supercapacitors

“…The XRD analysis confirmed the amorphous structure of BCN. Yang et al 50 synthesized BCN microtubules by the precursor pyrolysis approach with diethylenetriamine (DETA), aniline, and BCl 3 as the source materials. The BCN microtubules were deposited via the CVD method at a higher temperature during the pyrolysis procedure.…”

Recent insights into BCN nanomaterials – synthesis, properties and applications

“…Also, the minimum reflection loss can reach À43.6 dB at 7.92 GHz (thickness 3.5 mm). 223 6.8. Photodetectors BCN ultraviolet (UV) detectors showed a photoresponsivity of 6 mA/W under 365 nm illumination.…”