Drude–Lorentz resonance absorption in quasi-2D NiFe hydrotalcite/less layer graphite composites

The dielectric loss mechanism in low-dimensional carbon-based absorbing composites remains obscured, and clarifying the loss origin is beneficial for the design and preparation of high-performance electromagnetic absorbing materials. In this work, quasi-2D NiFe hydrotalcite/less layer graphite composites are synthesized by high-speed liquid shear method. The measurements of the microwave absorption show that it has a broadband absorption property. Particle swarm optimization algorithm is used to analyze and confirm the coexistence loss mechanism of Debye-relaxation and Drude–Lorentz resonance absorption in this material. The morphology, X-ray photoelectron spectroscopy and Raman spectroscopy characterization further elucidate that the quasi-2D interface between functional particles and carbon-based sheets is the physical origin for the enhancement of Drude–Lorentz resonance absorption. This study provides a novel strategy for improving the absorbing performance of carbon-based composite materials.