SrTiO3@Fe3O4@g-C3N4 ternary composite with heterogeneous interfaces for high-performance microwave absorption

In this work, a ternary composite of SrTiO3@Fe3O4@g-C3N4 is synthesized to exhibit superior microwave absorption performance across a broad frequency spectrum. The individual material and their composites are synthesized via in-situ hydrothermal processes. Characterization of samples are performed using XRD, FTIR, FE-SEM with EDAX, XPS and VSM to assess structural, morphological and magnetic properties respectively. The reflection loss (RL) reaches a minimum value of-34.28 dB at 10.26 GHz for a sample thickness of 1.9 mm. An effective bandwidth of 4.1 GHz is achieved within 8.2-12.4 GHz frequency range. The enhancement in absorption performance results from carefully optimized structural design, which features tuneable heterogeneous interfaces. Additionally, the ternary composite plays a significant role in improving interfacial polarization, resonance, and electromagnetic impedance matching. The distinctive structure of SrTiO3@Fe3O4@g-C3N4 composite utilizes a synergistic combination of magnetic and dielectric phases for microwave absorption, making them ideal for use in industrial and defence applications.