▎ 摘　　要

Ultra-light electromagnetic (EM) wave absorbers with strong absorption bandwidth are highly desired in reducing EM pollution. Herein, a series of nanocomposites with ZnO nanoparticles decorated nanoscale reduced graphene oxide (NRGO) were synthesized via a simple and efficient hydrothermal process. The characterizations reveal that NRGO with layered structure possesses intensive folds and the ZnO nanoparticles are well attached on the surface of NRGO. The EM parameters demonstrate that the EM wave absorption properties of ZnO/NRGO nanocomposite are closely related to the amount of NRGO. The minimum reflection loss (RL) values of ZnO/NRGO-10, ZnO/NRGO-15 and ZnO/NRGO-20 are - 44.4 dB with a thickness of 4.5 mm, - 39.6 dB with a thickness of 2.5 mm and - 18.8 dB with a thickness of 2.0 mm, respectively. The largest effective absorption bandwidths of ZnO/NRGO-10, ZnO/NRGO-15 and ZnO/NRGO-20 are 5.5 GHz at 2.5 mm, 5.2 GHz at 2.5 mm and 5.5 GHz at 2.0 mm, respectively. These outstanding EM wave absorption properties resulting from the multiple reflection, various polarization relaxation processes and synergistic effects between ZnO and NRGO. It is believed that as-synthesized ZnO/NRGO nanocomposite could be used as promising EM wave absorber.