Enhanced Electromagnetic Wave Interference by Nanoscale Mixed-Dimensional C-MoS₂ Magnetic van der Waals Heterostructures

It is generally believed that the matching of electromagnetic (EM) impedance or making the best of the interface polarization is an efficient way to achieve a good EM wave absorbing capability. Herein, the mixed-dimensional C-MoS2 based magnetic van der Waals heterostructures (vdWHs) were elaborately designed and successfully synthesized through the catalytic decomposition of C2H2 over Fe3O4–MoS2. By controlling the pyrolysis temperature, “3-0-2” type heterostructured C–Fe3O4–MoS2 ternary nanohybrid consisting of three-dimensional (3-D) carbon layers, zero dimensional (0-D) magnetite particles, and two-dimensional (2-D) MoS2 nanosheets (NSs) and “1-0-2” type CNTs-Fe@Fe3C-MoS2 vdWHs consisting of 1-D carbon nanotubes (CNTs), 0-D Fe and Fe3C nanoparticles, and 2-D MoS2 NSs were selectively synthesized. Compared to “0-2” type Fe3O4–MoS2, the obtained results demonstrated clearly that the introduction of carbon to form the mixed-dimensional C-MoS2 based magnetic vdWHs could greatly enhance the EM wave absorption properties. Owing to the better optimization between magnetic loss and dielectric loss and more defect dipole and interface polarizations, the obtained 1-0-2 type CNTs-Fe@Fe3C-MoS2 nanohybrid displayed enhanced microwave absorption property. Consequently, a versatile way was provided to produce the mixed-dimensional C-MoS2 based vdWHs for designing high-performance microwave absorption materials.