High-temperature stability core-shell engineered Ti3AlC2@C@SiO2 for excellent microwave absorbing properties

Layered structure Ti3AlC2 (TAC) has good thermal stability and excellent electrical conductivity, which is expected to be a great high-temperature electromagnetic microwave absorber. Herein, we derive TAC@C@SiO2 composites by catalytic chemical vapor deposition (CCVD) technology and Stöber process. Core-shell engineering can accomplish a mass loss of just 0.20% at 500°C for 1 h. An outstanding microwave absorption performance can be achieved with a minimum reflection loss of −31.63 dB and the maximum absorption bandwidth of 2.08 GHz at the matching thickness of 2.0 mm with the synergistic effect of abundant polarization mechanism and multiple scattering. Additionally, this research can serve as a guide for the utilization of TAC in the field of high-temperature microwave absorption materials, and can also provide suggestions for the design of environment-adaptable core-shell absorbers. •A simple strategy is developed to enhance the thermal stability and MAP.•The mass of TAC@C@SiO2 gains only 0.20% at 500 °C for 1 h.•The MAB of TAC@C@SiO2 is 2.08 GHz.•The RLmin of TAC@C@SiO2 is −31.63 dB.