Microwave absorption and thermal conductivity properties in NPC@MoSe₂/PDMS composites

As electronic devices develop rapidly toward miniaturization and integration, electromagnetic wave (EMW) interference and heat accumulation problems have risen sharply, thus thermal conductivity-EMW absorption integrated materials (HCMAMs) have received extensive attention. Herein, a dual-function hierarchical porous NPC@MoSe₂ filler was constructed by salt-template-assisted freeze-drying, calcination and hydrothermal reaction. 3D Nitrogen-doped porous carbon (NPC), a thermal and conductive path, is the prerequisite for the integration of EMW absorption and thermal conduction. Dense MoSe₂ layer reduces the discrepancy of impedance and phonon frequency between NPC and Polydimethylsiloxane (PDMS), optimizing the impedance matching and reducing the interface thermal resistance. Remarkably, under the fillings of only 15 w%, NPC@MoSe₂-2/PDMS exhibits optimal EMW absorption with a minimum reflection loss (RL_min) of −51.6 dB@18 GHz and an effective bandwidth (EAB) of 7.1 GHz, and excellent thermal conductivity performance with a thermal conductivity of 0.97 W/m·K, which is 304% higher than that of pure PDMS. Overall, this dual-functional NPC@MoSe₂-2/PDMS has great potential in protecting integrated electronic devices.