Multi-Interface Engineered rGO/CNT Carbon Composite for Entire X and Ku Bands Microwave Absorption

Here, we have effectively created a 2-dimensional rGO-based carbon composite material that is embellished with one-dimensional carbon nanotubes (CNTs). The phase composition and hierarchical structure of the composites are greatly altered by the addition of CNTs in the rGO. This leads to a multidimensional gradient, defects, diverse contacts, and hence improved microwave absorption capabilities. The composite exhibits a top-notch microwave absorption efficiency: RLmax for the composite GC 10 wt %, −42.03 dB of loss with an effective absorption bandwidth (EAB) of 1.36 GHz, and an EAB of 3.84 GHz at a thickness of 1.9 mm. While covering the whole X and Ku bands within a thickness range from 1.9 to 3.2 mm, the RLmax for GC 12.5 wt % loading is −59.8 dB, with an EAB of 3.52 GHz at a thickness of 2 mm. This composition covers the whole X and Ku bands within a thickness range from 1.5 to 3 mm. We demonstrate that the GC has the most noticeable transient coexistence of nanotube and sheet structures, which enhances the conduction loss mechanism and interfacial polarization. So, the rGO/CNT-based porous carbon composite has a lot of potential for next-generation applications, including stealth coatings and advanced communication devices.