In situ synthesis and electromagnetic wave absorbing properties of sandwich microstructured graphene/La-doped barium ferrite nanocomposite

Abstract

The development of high reflection loss and broad frequency bandwidth for electromagnetic wave absorbing materials has been pursued for a long time. Constructing a rational microstructure of an absorber will have significant impact on reflection loss increase and frequency bandwidth broadening. Herein, we successfully prepare a sandwich microstructured graphene/BaFe<inf>12</inf>O<inf>19</inf> nanocomposite by an in situ auto-combustion method. Compared to pure BaFe<inf>12</inf>O<inf>19</inf>, the sandwich microstructured graphene/BaFe<inf>12</inf>O<inf>19</inf> showed better electromagnetic wave absorbing properties. Furthermore, the sandwich microstructured graphene/Ba<inf>0.8</inf>La<inf>0.2</inf>Fe<inf>12</inf>O<inf>19</inf> nanocomposite was prepared with La-doped BaFe<inf>12</inf>O<inf>19</inf> using the same method. The obtained graphene/Ba<inf>0.8</inf>La<inf>0.2</inf>Fe<inf>12</inf>O<inf>19</inf> nanocomposite exhibited a saturation magnetization of 26.55 emu g^-1 at room temperature and exhibited excellent magnetic performance. The maximum reflection loss of the sandwich microstructured graphene/Ba<inf>0.8</inf>La<inf>0.2</inf>Fe<inf>12</inf>O<inf>19</inf> nanocomposite with a thickness of 1 mm could reach up to -40.26 dB, and a frequency bandwidth value below -10 dB was observed up to 3.87 GHz within the frequency range of 2-18 GHz.