Sandwich structured PLA fabrics with high electromagnetic interference shielding and low reflection characteristics

Sandwich structured polylactic acid (PLA) fabrics with high electromagnetic interference shielding and low reflection characteristics were prepared using a simple dip coating and spraying method. The middle layer of the sandwich-structured coatings was uniformly dispersed with highly conductive MXene fillers, while the surface of the layered MXene was modified by CTAB and loaded with magnetic Fe 3 O 4 fillers through electrostatic assembly, which was then uniformly dispersed into waterborne polyurethane as the outer layer. MXene@Fe 3 O 4 improves the impedance matching in the outer layer, so that the fabric has high-efficiency magnetic loss and dielectric loss. The obtained 10-1M3F/MXene/10-1M3F fabric exhibited a high average EMI shielding efficiency of 62.8 dB and a low reflection coefficient (R) of 0.34 in the X-band frequency range, wihch has a high application prospect in next-generation wearable smart electronic devices.