Indexed on: 25 Jan '17Published on: 25 Jan '17Published in: ACS Applied Materials & Interfaces
Design of interface to arouse interface polarization is an efficient route to attenuate high frequency electromagnetic wave. Meanwhile, the attenuation intensity is highly related to the contact area. To achieve stronger interface polarization intensity, metal oxide granular film on graphene with larger surface area seems to be an optimal way due to the high charge carrier concentration of graphene. Fabrication of film-like metal oxide on graphene was realized in this study by a facile thermal decomposition method. The relationship of contact area, polarization intensity as well as the type of metal oxide was studied in depth. Due to the high-frequency polarization effect, these composites presented excellent electromagnetic wave attenuation ability. As concluded, the optimal effective frequency bandwidth (fE) of GN/metal oxide was close to 7.0 GHz at a thin coating layer of 2.0 mm. Meanwhile, corresponding reflection loss (RL) value was nearly -22.1 dB. Considered the attenuation mechanism, interface polarization may play a key role on the attenuation ability.