Single-source-precursor derived multicomponent CNTs/Fe₃Si/Fe/SiOCN ceramic nanocomposites: microstructural evolution and excellent electromagnetic wave absorbing properties

Abstract

In the present work, novel single-source-precursors for CNTs/Fe3Si/Fe/SiOCN ceramic nanocomposites were synthesized by the reaction of poly (methylvinyl) silazane (HTT 1800) with ferric acetylacetonate [Fe(acac)3] and carboxylic functionalized carbon nanotubes...

Single-source-precursor derived SiOC ceramics with in-situ formed CNTs and core–shell structured CoSi@C nanoparticles towards excellent electromagnetic wave absorption properties

“…In addition, the ceramic matrix provides protection to the filler. For instance, CNTs are often dispersed in the ceramic matrix to avoid suffering from oxidation at relatively low temperatures [1,31,32]. However, there is little work on the simultaneous modification using both fillers to achieve synergistic effects of dielectric and magnetic losses.…”

Ultra‐wideband electromagnetic interference shielding properties of parallel expanded graphite/Fe3O4 composites

“…2 The detrimental electromagnetic (EM) waves not only disrupt the operation of sensitive electronic equipment, but also cause severe environmental pollution that seriously threatens human health. 3,4 Therefore, high performance EMI shielding materials for ultra-wideband frequencies of gigahertz are increasingly essential for various fields, 5 including personnel, public transportation, and military applications. 6 Ferrite materials are highly desirable as microwave absorbers due to their high magnetization and low cost.…”

“…10,11 For instance, the graphene/Fe 3 O 4 in a polyaniline matrix with a thickness of 2.39 mm shows a high EMI shielding effectiveness (SE) of 27 dB in the Ku-band (12.4-18 GHz), achieving EM wave attenuation of more than 99.8%. 12 The combination of conductive and magnetic materials can simultaneously enhance the dielectric and magnetic loss, 3 thereby optimizing the EMI shielding ability over a wide range of frequencies. 13 Intelligent integration of componential and structural advantages is also essential for the flexible tuning of EM properties in conductive/magnetic composites.…”

“…Meanwhile, the growing demand for related electronic devices makes severe electromagnetic interference (EMI) problems from electronic circuits, radio transmitters, power lines, etc 2 . The detrimental electromagnetic (EM) waves not only disrupt the operation of sensitive electronic equipment, but also cause severe environmental pollution that seriously threatens human health 3,4 . Therefore, high performance EMI shielding materials for ultra‐wideband frequencies of gigahertz are increasingly essential for various fields, 5 including personnel, public transportation, and military applications 6 …”

Bridged polysilsesquioxane‐derived SiOCN ceramic aerogels for microwave absorption

“…The electromagnetic wave absorption performance of PDC can be adjusted by controlling the morphology, composition, and structure of PDC. 1,2 In the previous work, different shapes of PDC powders, [10][11][12] fibers, [13][14][15] aerogels, [16][17][18][19][20][21][22] bulk, 23,24 and metamaterials 25 can be prepared owing to the availability of well-established thermoplastic shaping techniques. Furthermore, the flexible designability of ceramic polymer molecules affords not only binary, 26 ternary, 10,27 and quaternary 24,28 ceramics but also a wide variety of multicomponent compounds.…”