Hollow hydrangea-like Mo2C/MoO2/C composites with tunable phase compositions as highly efficient microwave absorbers

With the advancement of modern electronic communication technology, the development of efficient absorbing materials has attracted great interest. Here, hollow hydrangea-like Mo 2 C/MoO 2 /C composites are synthesized by soft template method. By adjusting the pyrolysis temperature, Mo 2 C/MoO 2 /C composites with different Mo 2 C and MoO 2 contents and degrees of graphitization can be selectively synthesized. The Mo 2 C/MoO 2 /C-800 composite with the 30 wt% filler content exhibits a minimum reflection loss of −62.9 dB at 1.6 mm and achieves a maximum absorption bandwidth of 6.2 GHz at 1.9 mm. The interaction between the dielectric properties of each component and the unique 3D hydrangea-like structure promotes microwave absorption and dissipation. Besides, CST simulation further demonstrates the effectiveness of electromagnetic wave dissipation in practical applications. The excellent properties of the hydrangea-like Mo 2 C/MoO 2 /C composites indicate their promising applications in electromagnetic wave absorbers.