Design and synthesis of NiCo/Co4S3@C hybrid material with tunable and efficient electromagnetic absorption

Hollow Beaded Fe3C/N-Doped Carbon Fibers toward Broadband Microwave Absorption

“…Figure a–c presents the ε′, ε″, and calculated dielectric loss tangent (tan δ ε = ε″/ε′) of all three FCF samples. As observed, both ε′ and ε″ show similar frequency dispersion characteristics, showing an obvious decline with increasing frequency due to the increased lagging of polarization at a higher frequency. ,, Besides, the pyrolysis temperature exhibits a conspicuous impact on the dielectric constants of FCF samples, and the FCF-800 sample possesses the highest ε′ (26.3 at 2 GHz) and ε″ (19.7 at 2 GHz) values among the three samples. According to the free electron theory, the superior conductivity would naturally lead to a higher ε″. , The increasing pyrolysis temperature results in more sufficient graphitization of the carbon matrix of FCF samples proven by the XRD and Raman analysis.…”

“…As observed, both ε′ and ε″ show similar frequency dispersion characteristics, showing an obvious decline with increasing frequency due to the increased lagging of polarization at a higher frequency. 18,53,54 Besides, the pyrolysis temperature exhibits a conspicuous impact on the dielectric constants of FCF samples, and the FCF-800 sample possesses the highest ε′ (26.3 at 2 GHz) and ε″ (19.7 at 2 GHz) values among the three samples. According to the free electron theory, the superior conductivity would naturally lead to a higher ε″.…”

How Nitrogen and Sulfur Doping Modified Material Structure, Transformed Oxidation Pathways, and Improved Degradation Performance in Peroxymonosulfate Activation

“…In addition, the lattice with a spacing of 0.292 nm was indexed to Co 4 S 3 (100) planes (Figure 1c). 31,32 Therefore, the TEM results demonstrated that the Co@rGO-S,N material could be defined as a thin-layered rGO decorated with different sized Co 4 S 3 . Elemental mapping images (Figure 1d) revealed the distribution of C, S, N, and Co, among which the distribution of Co and S was highly coincident with the nanoparticles, suggesting that the identified nanoparticles could be Co−S compounds.…”

Polyimide-derived porous carbon/Co particle-based composites for high-performance microwave absorption

“…Many studies on porous or core-shell structures have been reported in this eld. [25][26][27][28][29] In summary, the construction of porous structures plays a crucial role in improving the EMW absorption performance. So far, the complexity of the design and construction of porous structures has limited their largescale fabrication.…”