Journal
MATERIALS
Volume 11, Issue 11, Pages -Publisher
MDPI
DOI: 10.3390/ma11112145
Keywords
graphene oxide; Ni nanoparticles; gamma-ray irradiation; radiation-induced reduction; electromagnetic wave absorbing
Categories
Funding
- National Natural Science Foundation of China [11505011]
- Beijing Nova Program [Z181100006218087]
- Beijing Great Wall Scholars Incubator Program [CTTTCD20180321]
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A facile and environmentally friendly method is proposed to prepare reduced graphene oxide-nickel (RGO-Ni) nanocomposites using gamma-ray irradiation. Graphene oxide (GO) and Ni2+ are reduced by the electrons which originated from the gamma radiolysis of H2O. The structure and morphology of the obtained RGO-Ni nanocomposites were analyzed using X-ray diffraction (XRD) and Raman spectroscopy. The results show that Ni nanoparticles were dispersed uniformly on the surface of the RGO nanosheets. As expected, the combination of RGO nanosheets and Ni nanoparticles improved the electromagnetic wave absorption because of the better impedance matching. RGO-Ni nanocomposites exhibited efficient electromagnetic wave absorption performance. The minimum reflection loss (RL) of RGO-Ni reached -24.8 dB, and the highest effective absorption bandwidth was up to 6.9 GHz (RL < -10 dB) with a layer thickness of 9 mm.
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