Abstract
The ternary composite of hollow ZnFe2O4 microspheres@graphene decorated with TiO2 nanosheets was fabricated by two-step hydrothermal method. FESEM and TEM images illustrate that hollow ZnFe2O4 microspheres with an average diameter of about 300–500 nm were attached to the surface of transparent graphene sheets. In addition, TiO2 nanosheets were grown on the top of ZnFe2O4@graphene with a random orientation. Electromagnetic (EM) wave absorption results demonstrate that the maximum reflection loss (RL) of ZnFe2O4@graphene@TiO2 composite are significantly enhanced, which can be up to −55.6 dB at 3.8 GHz for a coating of 2.5 mm. The maximum absorbing bandwidth exceeding −10 dB is almost 6.4 GHz (2.8–5.4 GHz, 12.9–14.5 GHz, 15.8–18 GHz) at only 2.5 mm. Consequently, it is supposed that the hierarchical structure of ZnFe2O4@graphene@TiO2 composite can be served as a promising microwave absorber, especially in low frequency.
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