Although lightweight and three-dimensional(3D)graphene aerogels are highly desirable for microwave absorption(MA)due to their high porosity,specific surface area,and 3D conductive network,it still re-mains a large challenge to construct a multifunctional application framework to quickly adapt to the com-plex practical environment,making it to be efficiently applied in a variety of complex situation.Herein,multifunctional aramid nanofibers(ANFs)reinforced reduced graphene oxide aerogels(RGO@ANF)have been achieved by in-situ gel reaction,freeze-drying,and thermal annealing processes.The introduced ANFs in RGO aerogels can prevent the graphene sheets from over-stacking and enhance the connectivity of cell walls,thus leading to excellent compression resistance,MA,sound absorption,and thermal in-sulation performance.Under 70％strain,the maximum compressive stress of RGO@ANF aerogel reaches 78.8 kPa,and reversible compressibility with reliable resistance to fatigue for 100 compressive cycles at 20％strain.Further,the RGO@ANF aerogel exhibit a minimum reflection loss(RLmin)of-56.5 dB and a maximum effective absorption bandwidth(EAB)of 7.0 GHz at a thickness of 2.8 mm,basically covering the X and Ku bands.Moreover,the hybrid aerogel exhibited excellent sound absorption with an aver-age absorption coefficient＞0.56 at 2-6 kHz and good thermal insulation performance with low thermal conductivity of about 49.18 mW m-1 K-1.The integrated graphene aerogels with such multifunctional performances hold a great promise for applications such as MA,sound absorption,and heat insulation.

Qian Liu;Liang Tang;Jinzhe Li;Yao Chen;Zhengkang Xu;Jiatong Li;Xinyu Chen;Fanbin Meng

Key Laboratory of Advanced Technologies of Materials(Ministry of Education),School of Materials Science and Engineering,Southwest Jiaotong University,Chengdu 610031,China;Shenzhen Institute of Southwest Jiaotong University,Shenzhen 518000,China

材料科学技术（英文版）

[1]Qian Liu;Liang Tang;Jinzhe Li;Yao Chen;Zhengkang Xu;Jiatong Li;Xinyu Chen;Fanbin Meng-.Multifunctional aramid nanofibers reinforced RGO aerogels integrated with high-efficiency microwave absorption,sound absorption and heat insulation performance)[J].材料科学技术（英文版）,2022(35):166-175

sulation

Multifunctional,aramid,nanofibers,reinforced,RGO,aerogels,integrated,efficiency,microwave,absorption,sound,heat,insulation,Although,lightweight,three,dimensional,graphene,highly,desirable,MA,due,their,porosity,specific,surface,area,conductive,network,still,mains,large,challenge,construct,multifunctional,framework,quickly,adapt,practical,environment,making,efficiently,applied,variety,complex,situation,Herein,ANFs,reduced,oxide,have,been,achieved,by,reaction,freeze,drying,thermal,annealing,processes,introduced,can,prevent,sheets,from,stacking,enhance,connectivity,walls,thus,leading,excellent,compression,resistance,Under,strain,maximum,compressive,stress,reaches,kPa,reversible,compressibility,reliable,fatigue,cycles,Further,minimum,reflection,loss,RLmin,dB,effective,bandwidth,EAB,GHz,thickness,basically,covering,Ku,bands,Moreover,hybrid,exhibited,aver,age,coefficient,kHz,good,low,conductivity,about,mW,such,performances,hold,great,promise,applications

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