Synthesis and excellent microwave absorption properties of graphene/polypyrrole composites with Fe₃O₄ particles prepared via a co-precipitation method

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 Fe₃O₄ have never been reported. Herein, in order to expand the scope of microwave absorbers, the graphene/polypyrrole/Fe₃O₄ (GN/PPy/Fe ₃O₄) composites were synthesized by a co-precipitation method. The microwave absorbability reveals that GN/PPy/Fe₃O ₄ exhibits excellent microwave absorption properties and broad absorption bandwidths compared with GN, GN/PPy and GN/Fe₃O ₄. The maximum reflection loss of GN/PPy/Fe₃O₄ 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/Fe₃O ₄ can be used as an attractive candidate for the new type of microwave absorbers.