Synthesis and excellent microwave absorption properties of graphene/polypyrrole composites with Fe_3O_4 particles prepared via a co-precipitation method

摘要

The microwave absorption properties of the presented ternary composites are not satisfactory and the microwave absorption properties of the ternary composites composed of graphene, polypyrrole and Fe_3O_4 have never been reported. Herein, in order to expand the scope of microwave absorbers, the graphene/polypyrrole/Fe_3O_4 (GN/PPy/Fe_3O_4) composites were synthesized by a co-precipitation method. The microwave absorbability reveals that GN/PPy/Fe_3O_4 exhibits excellent microwave absorption properties and broad absorption bandwidths compared with GN, GN/PPy and GN/Fe_3O_4. The maximum reflection loss of GN/PPy/Fe_3O_4 is up to -56.9 dB at 6.6 GHz with a thickness of 5.3 mm and the absorption bandwidths exceeding -10 dB are more than 15.1 GHz with a thickness in the range of 3-7 mm. Furthermore, our strategy confirms that GN/PPy/Fe_3O_4 can be used as an attractive candidate for the new type of microwave absorbers.