Ultralight aerogel sphere composed of nanocellulose-derived carbon nanofiber and graphene for excellent electromagnetic wave absorption  

作　　者：Runa Zhang Bin Li Yunfei Yang Na Wu Zhuyin Sui Qingfu Ban Lili Wu Wei Liu Jiurong Liu Zhihui Zeng 

机构地区：[1]Key Laboratory for Liquid–Solid Structural Evolution and Processing of Materials,Ministry of Education,School of Materials Science and Engineering,Shandong University,Jinan 250061,China [2]Department of Chemistry and Applied Biosciences,ETH Zurich,Zurich CH-8093,Switzerland [3]School of Chemistry and Chemical Engineering,Yantai University,Yantai 264005,China [4]State Key Laboratory of Crystal Materials,Institute of Crystal Materials,Shandong University,Jinan 250100,China [5]Shenzhen Research Institute of Shandong University,Shenzhen 518063,China [6]Suzhou Research Institute of Shandong University,Suzhou 215123,China

出　　处：《Nano Research》2023年第5期7931-7940,共10页纳米研究（英文版）

基　　金：the National Key R&D Program of China(No.2021YFB3502500);the Natural Science Foundation of Shandong Province(Nos.2022HYYQ-014 and ZR2016BM16);the New 20 Funded Programs for universities of Jinan(No.2021GXRC036);the Provincial Key Research and Development Program of Shandong(Nos.2019JZZY010312 and 2021ZLGX01);the National Natural Science Foundation of China(No.22205131);the Natural Science Foundation of Jiangsu Province(No.BK20220274);the Shenzhen Municipal Special Fund for Guiding Local Scientific and Technological Development(No.2021Szvup071);the Joint Laboratory project of Electromagnetic Structure Technology(No.637-2022-70-F-037);the Qilu Young Scholar Program of Shandong University(No.31370082163127).

摘　　要：A novel type of three-dimensional ultralight aerogel sphere,consisting of one-dimensional nanocellulose-derived carbon fibers and two-dimensional graphene layers,was prepared based on a developed drop-freeze-drying followed by carbonization approach.The nanofibrous carbon efficiently prevents the agglomeration of the graphene layers,which,in turn,reduces the shrinkage and maintains the structural stability of the hybrid carbon aerogel spheres.Consequently,the aerogel spheres showing an ultralow-density of 2.8 mg/cm^(3) and a porosity of 99.98%accomplish the tunable dielectric property and electromagnetic wave(EMW)absorption performance.The high-efficiency utilization of biomass-derived fibrous nanocarbon,graphene,the porous structure of the hybrid aerogel spheres leads to the excellent EMW absorption performance.The aerogel spheres display an effective absorption bandwidth of 6.16 GHz and a minimum reflection loss of−70.44 dB even at a filler loading of merely 3 wt.%,significantly outperforming that of other biomass-derived carbon-based EMW absorbing materials.This work offers a feasible,facile,scalable approach for fabricating high-performance and sustainable biomass-based aerogels,suggesting a tremendous application potential in EMW absorption and aerospace.

关 键 词：NANOCELLULOSE AEROGEL GRAPHENE electromagnetic wave absorption composite 

分 类 号：TB3[一般工业技术—材料科学与工程]