Abstract Carbon aerogels derived from biomass have been considered as potential microwave absorption (MA) materials because of the intrinsic hierarchical porous structure, low density, and excellent heat resistance. However, high carbonation temperature or long carbonation time is always required to achieve optimized MA performance. Herein, the low-temperature carbonization of carbon nanotube (CNT)/cellulose aerogel was realized to develop a carbon aerogel for efficient MA. Compared with the carbon aerogel derived from pristine cellulose, the incorporation of CNT endowed the CNT/cellulose-derived carbon aerogel with improved dielectric loss, and thus improved MA performance at reduced carbonation temperature. The carbon aerogel carbonized at only 550 °C for 2 h exhibited a minimum reflection loss value of −43.6 dB and a broad effective absorption bandwidth (reflection loss below −10 dB) of 7.42 GHz. The low carbonation temperature and outstanding MA performance make this new carbon aerogel be promising candidate for MA applications.
Last. Panbo Liu(NPU: Northwestern Polytechnical University)H-Index: 38
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Abstract Lightweight and high-performance are two determining factors for metal-organic-frameworks (MOFs) derived microwave absorbers. However, most of the reported MOFs derived absorbers usually possess high filler loading. Herein, a series of MOFs derived magnetic porous carbon microspheres with tunable diameter and high specific surface area have been synthesized via a pyrolysis process. The synthesized magnetic porous carbon microspheres, constructed by uniformly distributed core-shell Ni@C,...
#1Bin Quan(NUAA: Nanjing University of Aeronautics and Astronautics)H-Index: 25
#2Weihua Gu(NUAA: Nanjing University of Aeronautics and Astronautics)H-Index: 14
Last. Guangbin Ji(NUAA: Nanjing University of Aeronautics and Astronautics)H-Index: 69
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As electromagnetic absorbers with wide absorption bandwidth are highly pursued in the cutting-edge electronic and telecommunication industries, the traditional dielectric or magnetic bulky absorbers remain concerns of extending the effective absorption bandwidth. In this work, a dual-principle strategy has been proposed to make a better understanding of the impact of utilizing conductive absorption fillers coupled with implementing artificial structures design on the absorption performance. In t...
#1Weihua Gu(NUAA: Nanjing University of Aeronautics and Astronautics)H-Index: 14
#2Xiaoqing Cui(NUAA: Nanjing University of Aeronautics and Astronautics)H-Index: 6
Last. Guangbin Ji(NUAA: Nanjing University of Aeronautics and Astronautics)H-Index: 69
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Abstract The self-dissipation and attenuation capacity of materials play an important role in realizing efficient electromagnetic absorption, in this case, the roles of macroscopic composition and micro-structure should be emphasized simultaneously in the reasonable design of microwave absorbent. Given that, Fe3N alloy embedded in two-dimensional porous carbon composites were fabricated via facile sol-gel and sacrificial template methods. Satisfactorily, the magnetic/dielectric materials combina...
It is essential to manufacture microwave absorbers with strong absorption as well as tunable absorption bands at a low filler content. However, it remains challenging for pure biomass material to reach this goal without loading other components. MoSe2, as a transition metal chalcogenide with semiconductor properties, has emerged as a potential microwave absorber filler. Herein, bacterial cellulose (BC)-derived carbon nanofibers/MoSe2 nanocomposite was fabricated and phosphoric acid was used to d...
Abstract With the pursuit of high-efficiency microwave absorbing materials (MAMs), biomass derived porous carbon (BPC)-based materials have attracted a great deal of attentions due to their plentiful resources, low density and highly environment-friendly. The microwave absorption of BPC composites is closely correlated to their composition, surface chemical activity, microstructures, and pore size, which are in turn decisively determined by the biomass precursors and subsequent carbonization or ...
Last. Baoliang Zhang(NPU: Northwestern Polytechnical University)H-Index: 29
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Abstract In this work, three-dimensional (3D) pleated RGO/MXene/Fe3O4 microspheres (FMCM) are successfully fabricated by simple and rapid ultrasonic spray technology. Reduced graphene (RGO), MXene nanosheets and Fe3O4 nanoparticles are properly assembled together to achieve comprehensive advantages. The microspheres exhibit large specific surface area and hierarchical pores. According to the comparison of wave absorbing properties, the optimal dosage ratio of graphene oxide (GOx) to MXene is fir...
#1Min Zhang(BIT: Beijing Institute of Technology)H-Index: 13
#2Chen Han(BIT: Beijing Institute of Technology)H-Index: 4
Last. Jie Yuan(MUC: Minzu University of China)H-Index: 52
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It is extremely unattainable for a material to simultaneously obtain efficient electromagnetic (EM) absorption and green shielding performance, which has not been reported due to the competition between conduction loss and reflection. Herein, by tailoring the internal structure through nano-micro engineering, a NiCo2O4 nanofiber with integrated EM absorbing and green shielding as well as strain sensing functions is obtained. With the improvement of charge transport capability of the nanofiber, t...
Abstract Structure design and composition control are two crucial factors in determining the microwave absorption performance for absorbers, however, it still possess formidable challenges to balance the dual coordination between them. Herein, a coordination assembly strategy is used to synthesize Co2+-organic polymer coordination materials, then, Co/N-doped porous carbon (Co/NPC) composites, in which Co particles encapsulated in the interior framework of N-doped porous carbon, are obtained by a...
Last. Mao-Sheng Cao(BIT: Beijing Institute of Technology)H-Index: 87
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Abstract Herein, ultra-thin tungsten disulfide nanosheets/carbon nanotubes (WS2-NS/CNTs) hybrids were successfully synthesized by using a one-step hydrothermal method. The WS2-NS is evenly grown on the surfaces of CNTs, leading to a remarkable three-dimensional (3D) heterostructure. Outstanding electromagnetic wave absorption performance of the WS2-NS/CNTs hybrids can be achieved by tuning the amount of CNTs. The minimum reflection loss can reach up to -51.6 dB at 14.8 GHz, and the effective abs...