Solution-casting dielectric composite toward high energy storage density utilizing molybdenum disulfide sheets

Dopamine was used to functionalize the surface of MoS₂ to form MoS₂@DA sheets. The MoS₂@DA sheets were incorporated into PVDF matrix to prepare PVDF/MoS₂@DA composites by solution casting method The results indicate that dielectric constant of PVDF/MoS₂@DA composites were notably improved, compared with pure PVDF (ε_r≈10), with the mass fraction of filler less than 3.5 wt% The percolation occurred at a low filler content of 2.67 wt% with a sharp increase of dielectric constant. D-E loops and energy storage behavior were also measured and discussed. The maximum energy density of the composite with 0.33 wt% MoS₂ was 1.75 J cm^-3.