Heterogeneous Interface Engineering of 1D Hybrid Nanobelts Decorated with Mo₂N–Mo_<i>x</i>C Nanoparticles for Boosting Microwave Absorption

Heterogeneous interface engineering is a key strategy for obtaining dielectric absorbers with a high microwave absorption (MA) performance. In this study, a one-step carbonization–nitridation process is utilized to generate an abundant nanoscale dense heterogeneous interface on the surface of one-dimensional hybrid nanobelts (Mo2N–MoxC/NC). A suitable pyrolysis temperature introduces highly dispersed Mo2N–MoxC heterogeneous units to the carbon matrix, which effectively suppresses the agglomeration of nanoparticles and dissipates the energy of the electromagnetic waves through interfacial interactions. Benefiting from high conductivity, enhanced dielectric response, and abundant active sites of the nanobelts, Mo2N–MoxC/NC exhibits remarkable MA properties with a maximum reflection loss of up to −61.3 dB and a maximum response bandwidth of 4.6 GHz. The MA capacity was analyzed using the radar cross-section (RCS) reduction value, calculated by a computer simulation technique. The optimum RCS reduction value for the material was determined to be 21.75 dBm2. This work underscores the synergistic effect of heterointerface engineering and dielectric multicomponents on MA, providing inspiration and strategies for the rational construction of multiple heterogeneous structures.