Thermally Stable Silicone Elastomer Composites Based on MoS₂@Biomass-Derived Carbon with a High Dielectric Constant and Ultralow Loss for Flexible Microwave Electronics

With the miniaturization and integration of electroniccomponentsin wireless communication and wearable devices, the demand for low-costflexible composites with temperature-stable high dielectric constantand low loss has substantially increased. However, such comprehensiveproperties are fundamentally difficult to combine for conventionalconductive and ceramic composites. Here, we develop silicone elastomer(SE) composites based on hydrothermally grown MoS2 on tissuepaper-derived cellulose carbon (CC). Such design promoted the formationof microcapacitors, multiple interfaces, and defects reinforcing interfacialand defect polarizations and resulting in a high dielectric constantof 9.83 at 10 GHz with low filler loading of 15 wt %. Unlike highlyconductive fillers, MoS2@CC with low conductivity ensureda very low loss tangent of 7.6 x 10(-3), whichwas also influenced by the filler dispersion and adhesion to the matrix.Apart from breaking the typical conflict between high dielectric constantand low losses of traditional conductive composites, MoS2@CC SE composites were highly flexible with temperature-stable dielectricproperties making them attractive as flexible substrates in microstripantenna applications and extreme environment electronics. Moreover,recycling from waste tissue paper makes them potential candidatesas low-cost and sustainable dielectric composites.