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| 1 | Advances in core–shell engineering of carbon-based composites for electromagnetic wave absorption显示文摘Electromagnetic(EM)absorption is paving the way to overcome the challenges related to conventional shielding strategy against EM pollution through sustainable energy dissipation.As characteristic functional media that can interact with electric or magnetic field branch,EM wave absorption materials(EWAMs)have received extensive attention and realized considerable development in the past two decades,where carbon-based composites are always considered as promising candidates for high-performance EMAWs due to their synergetic loss mechanism as well as diversified composition and microstructure design.Recent progress indicates that there is more and more interest in the fabrication of carbon-based composites with unique core–shell configuration.On one hand,core–shell configuration usually ensures good chemical homogeneity of final products and provides some positive protections for the components with susceptibility to corrosion,on the other hand,it creates enough heterogeneous interfaces between different EM components,which may bring enhanced polarization effect and intensify the consumption of EM energy.In this review,we firstly introduce EM wave absorption theory,and then highlight the advances of core–shell engineering in carbonbased composites in terms of built-in carbon cores and built-out carbon shells.Moreover,we also show some special core–shell carbon-based composites,including carbon/carbon composites,assembled composites,and decorated composites.After analyzing EM absorption performance of some representative composites,we further propose some challenges and perspectives on the development of core–shell carbon-based composites. | Lixue Gai Honghong Zhao Fengyuan Wang Pan Wang Yonglei Liu Xijiang Han Yunchen Du | 2022 | Nano Research2022，15，10： | 5 |
| 2 | Reduced graphene oxide@carbon sphere based metacomposites for temperature-insensitive and efficient microwave absorption显示文摘With the increasing advance of fifth generation(5G)network and the gradual expansion of digital devices,harsh working environment for electronic devices has spawned higher requirements for microwave absorbing materials(MAMs).Since both the electromagnetic response and energy conversion character vary with temperature,to achieve temperature insensitive microwave absorption behaviour in wide temperature range has become extremely challenging.In this work,structured metacomposites containing sub-wavelength reduced graphene oxide(RGO)@carbon spheres were fabricated,and the microwave absorption was further improved through structural and composition design of the RGO@carbon units.Due to the unique anti-reflection effect on microwave of the metacomposites,the temperature-insensitive electromagnetic performance at elevated temperature could be exhibited.Moreover,both the dielectric relaxation behaviour and microwave absorption proformance of the system could be further increased.As a result,the effective absorption bandwidth(reflection loss(RL)<−10 dB)of the metacomposites with only 3.0 wt.%filler content could cover the entire X-band(8.2–12.4 GHz)frequency ranging from 298 to 473K.The metacomposite proposed in this work provides a“de-correlating”strategy to break the linkage between microwave absorption behaviour and temperature,which offers an interesting plateau for fabricating efficient high-temperature microwave absorption structures with tunable and designable advantages. | Zhiyang Jiang Haoxu Si Yi Li Dan Li Huihui Chen Chunhong Gong Jingwei Zhang | 2022 | Nano Research2022，15，9： | 4 |
| 3 | TiO_(2)/Ni/rGO气凝胶的可控制备及其吸波性能研究显示文摘传统吸波材料诸如铁氧体密度较大且稳定性差,已无法满足当前吸波性能需求。开发具有轻质、宽频、高吸收性能的新型复合吸波材料是目前功能材料领域的重点研究方向。为了改善石墨烯介电常数较大、阻抗失配等问题,提高石墨烯的吸波性能,本工作将石墨烯与磁性材料和介电材料复合,通过引入磁损耗和改善介电损耗的方式,制备出具有三维孔洞结构且综合性能优异的石墨烯基复合气凝胶。通过设计正交试验,选取不同Ni和TiO_(2)含量,一步水热法制备得到了TiO_(2)/Ni/rGO复合气凝胶。依据介电损耗和磁损耗间的协同作用,TiO_(2)/Ni/rGO的吸波性能在Ni链含量10mg和钛酸丁酯(TBOT)溶液2ml时达到最优,其在匹配厚度2.4mm、频率15.96GHz处最小反射损耗值为-51.9dB。介电/磁损耗介质掺杂石墨烯复合气凝胶TiO_(2)/Ni/rGO吸波性能的提高为有效调控吸波性能提供了新思路。 | 纪涵昱 郭晓琴 冯德胜 杨向阳 徐樱宛 任玉美 | 2022 | 当代化工研究2022，，20： | 0 |
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