Titanium carbide (MXene) nanosheets as promising microwave absorbers

The electromagnetic properties of Ti₃C₂ nanosheets, prepared by immersing Ti₃AlC₂ powders in HF and subsequent ultrasonication, were first investigated in the frequency range of 12.4–18 GHz. The Ti₃C₂ nanosheet filled composites showed high relative complex permittivity and microwave absorption as compared to those filled with the original Ti₃AlC₂ powders under the same content. Reflection loss values of the Ti₃C₂ nanosheets filled composites exceeded −11 dB (more than 92% absorption) in the frequency range of 12.4–18 GHz with a thickness of 1.4 mm. These results suggest that the Ti₃C₂ nanosheets with unique dielectric properties are highly promising fillers for dielectric and electromagnetic applications.