Multifunctional SiC@SiO2 Nanofiber Aerogel with Ultrabroadband Electromagnetic Wave Absorption

Abstract

Traditional ceramic materials are generally brittle and not flexible with high production costs, which seriously hinders their practical applications. Multifunctional nanofiber ceramic aerogels are highly desirable for applications in extreme environments, however, the integration of multiple functions in their preparation is extremely challenging. To tackle these challenges, we fabricated a multifunctional SiC@SiO2 nanofiber aerogel (SiC@SiO2 NFA) with a three-dimensional (3D) porous cross-linked structure through a simple chemical vapor deposition method and subsequent heat-treatment process. The as-prepared SiC@SiO2 NFA exhibits an ultralow density (~ 11 mg cm− 3), ultra-elastic, fatigue-resistant and refractory performance, high temperature thermal stability, thermal insulation properties, and significant strain-dependent piezoresistive sensing behavior. Furthermore, the SiC@SiO2 NFA shows a superior electromagnetic wave absorption performance with a minimum refection loss (RLmin) value of − 50.36 dB and a maximum effective absorption bandwidth (EABmax) of 8.6 GHz. The successful preparation of this multifunctional aerogel material provides a promising prospect for the design and fabrication of the cutting-edge ceramic materials.

Magnetic enhanced high-efficiency electromagnetic wave absorbing MXene/Fe3O4 composite absorbers at 2–40 GHz

“…Charge separation easily occurs at the overlapping interface, which induces the generation of dipoles and increases the polarization loss of dipoles. 43 The increased defect density will lead to enhanced dipole moments. Under the altering EM field, the enhanced dipole polarization can magnify energy dissipation, resulting in the increase of the EMW absorption ability.…”

Construction of hydrangea-like core–shell SiO 2@Ti 3C 2T x @CoNi microspheres for tunable electromagnetic wave absorbers

“…8b-d) and between (Fig. 8f-i) the tiny capacitors with the continuous amplification of the signal, leading to a strong interfacial polarization [49,69].…”

Lightweight Honeycomb rGO/Ti3C2Tx MXene Aerogel without Magnetic Metals toward Efficient Electromagnetic Wave Absorption Performance

“…In today’s world, there exists increasingly serious electromagnetic wave (EMW) interference radiation and pollution for the high-speed development electric industry. − To alleviate these problems, high-efficiency EMW-absorbing materials with the superiorities of light weight, thin thickness, wide EMW effective absorption band (EAB), and strong reflection loss (RL) are urgently demanded. − To date, several previous studies principally pay close attention to the control of micromorphology and the best combination between dielectric and magnetic compositions. − For example, Tian and his co-workers prepared a type of zeolitic-imidazolate framework (ZIF-67) derivative embedded boron carbonitride (BCN) nanocomposites. With the filler ratio of 48 wt %, the minimum RL value reached at −56.7 dB at 12.4 GHz when the matching thickness is 2.9 mm.…”