Construction of core-shell PPy@MoS2 with nanotube-like heterostructures for electromagnetic wave absorption: Assembly and enhanced mechanism

Herein, a novel core-shell PPy@MoS2 nanotube-like heterostructures were prepared with hollow polypyrrole nanotubes and intertwined MoS2 nanosheets as core and the outer shell, respectively, by combining chemical oxidative polymerization and hydrothermal process. The unique heterostructures endowed the designed composite with highly enhanced electromagnetic wave absorbing performance. In contrast to pristine hollow PPy nanotubes and MoS2 nanoflowers, the fabricated PPy@MoS2 composite not only possessed excellent reflection loss (RL) performance, but also displayed a broad absorbing bandwidth, which might be ascribed to the good impedance matching and multifarious loss pathways including dipole polarization, interfacial polarizations and conductive loss. Impressively, the widest bandwidth (RL < -10 dB) of PPy@MoS2 could be gained up to 6.4 GHz at 2.5 mm, and the optimal RL is -49.1 dB at 6.1 GHz. In combination of controllable preparation process and highly enhanced performance, this newly PPy@MoS2 might be a promising candidate in remediation of electromagnetic wave pollution.