Microporous Reduced Graphene Oxide Foam Containing Ni(OH)₂ Nanoparticles for Broadband Electromagnetic Wave Absorption

With the growing demand for simplifying fabrication process of advanced electromagnetic wave absorbers, Ni(OH)2 nanoparticles/reduced graphene oxide (RGO) composite foam (NHGF), a high-performance microwave absorber, has been proposed via a facile hydrothermal method. Besides lightweight characteristic, NHGF also possesses broadband microwave absorption capacity whose effective absorption band (EAB) can reach 7.65 GHz and the minimum reflection loss (RLmin) is up to −54.69 dB at a thickness of 3.5 mm. Moreover, its wave absorption capability can be adjusted through altering Ni(OH)2 content. Some heterogeneous interface effect caused by Ni(OH)2 nanoparticles can significantly enhance the interfacial polarization. Ni(OH)2 nanoparticles can contribute to the outstanding impedance matching performance as well as electromagnetic microwave absorption performance of NHGF. Therefore, NHGF, as a broadband microwave absorbing material, is expected to be applied in some advanced electromagnetic protection as well as practical electronic engineering fields.