Carbonized Kevlar Nanofiber/Carbon Nanotube/Magnetic Nanoparticle Hybrid Aerogel Fibers for Microwave Absorption

Abstract

Traditional passive jamming media always suffer from high density and impedance mismatch, which have restricted them from being directly utilized as microwave absorbing materials. Herein, carbonized Kevlar nanofiber/carbon nanotube/ magnetic nanoparticle (CKNF/CNT/MNP) hybrid aerogel fibers with low apparent density (0.12 g/cm 3 ) and adjustable electromagnetic parameters are fabricated for microwave absorption. The minimum reflection loss (RL min ) of the aerogel fibers reaches −59 dB at 14.8 GHz, and the effective absorption bandwidth (EAB) reaches the whole Ku-band with 1.8 mm thickness. In addition, the aerogel fibers can be further developed into microwave absorptive smoke, which exhibits a wide microwave absorption frequency (5.5−15.5 GHz).

Lightweight and Thin with High-Frequency Performance Microwave Absorbing Heterostructure Carbon Derived from Ashoka-leafs Ash

“…These composites can be tailored to have the desired electromagnetic properties for e cient microwave absorption. By adjusting the composition and structure of heterostructure carbon ash, you can tune its electrical conductivity and magnetic properties to match the frequency of the incident microwaves [9], [10], [11], [12], [13], [14], [15], [16]. Designing the heterostructure carbon ash with multiple absorption peaks across a wide range of microwave frequencies can improve its overall performance as a microwave absorber.…”

“…It can be designed to have a high surface area and controlled conductivity, which makes it effective at absorbing microwave radiation [4], [5]. The heterostructure carbon ash or carbonaceous materials can be combined with other materials, such as polymers [2][6], ceramics [7], [8], [9], [10], [11], [12], [13] or metallic nanoparticles, to create composite materials.…”

Ultralight Hierarchical Fe3O4/MoS2/rGO/Ti3C2Tx MXene Composite Aerogels for High-Efficiency Electromagnetic Wave Absorption

“…Electromagnetic (EM) waves serve as crucial carriers of energy in various communication technologies; however, the widespread proliferation of electronic devices and wireless communication technologies has inevitably led to EM wave pollution, which causes interference risks to precision instruments and potential threat to human health. , To tackle these problems, researchers have developed various EM wave absorption materials, including traditional magnetic materials, dielectric materials, − metal–organic frameworks (MOFs), − and carbon-based materials such as carbon nanotubes (CNTs) and carbon fiber (CF). − Recently, with the trend toward miniaturization and lightweight design in electronic and communication devices, the demand for EM wave absorbers that are ultralight, ultrathin, highly efficient, and capable of broad bandwidth absorption has intensified. This development trend renders conventional magnetic or dielectric powder and single-component carbon-based materials inadequate for practical application.…”

Enhanced Microwave Absorption Performance of α-FeOOH Nanorods on Carbon Aerogel Powder

“…Carbon aerogels (CAs) are a kind of porous carbon material with a three-dimensional (3D) network structure . Because of its unique structure, it shows excellent characteristics such as high porosity (80–99%), large specific surface area, low density, mechanical stability, high electrical conductivity, low thermal conductivity, and excellent electrical conductivity. − Many researchers have tuned the electromagnetic parameters and impedance matching of composites through nanostructure design, such as core–shell structures, mesoporous structures, hollow structures, and composite dielectric/magnetic media. , When used as electromagnetic microwave absorbers, carbon aerogels often need to be ground into micron-sized powders. Wang et al prepared TiO 2 /carbon aerogel (TCA) microspheres with a minimum reflection loss (RL min ) of −30.2 dB and a maximum effective absorption bandwidth (EAB) of 6.2 GHz at a thickness of 2 mm, which provides a new approach for the use of lightweight aerogels for microwave absorption .…”