Uniformly dispersed nickel single atoms(SAs)are experimentally prepared on ultralight N-doped graphene aerogels(Ni-SA@NRGA).The experimental results show that Ni-SAs in graphene aerogels can improve the conduction,polarization losses,and impedance matching properties of the Ni-SA@NRGA.As a result,the minimum reflection loss(R_(L,min))of Ni-SA@NRGA is-49.46 d B with a matching thickness of 2.0 mm and the broadest efficient absorption bandwidth is 3.12 GHz at a low thickness of 1.5 mm.Meanwhile,even with a matching thickness of 1.2–2.0 mm,the RL,min value of Ni-SA@NRGA can reach-20 d B.The current study demonstrates the significance of incorporating metal single atoms into graphene aerogel for electromagnetic wave absorption.
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