A Stretchable Electromagnetic Interference Shielding Fabric with Dual-Mode Passive Personal Thermal Management

Electromagnetic interference (EMI) shielding fabrics are crucial in addressing the increasingly serious electromagnetic pollution. To meet wearable requirements, stretchability and thermal comfortability are often desired, but which still are challenging. Herein, a stretchable EMI shielding fabric is fabricated via electrospinning coupled with biaxial pre-stretching spraying, in which a block stacking wrinkled silver nanowire (AgNW)/Ti3C2Tx MXene network is coated on one side of electrospun thermoplastic polyurethane (TPU)/polydimethylsiloxane (PDMS) fabric. As expected, the wrinkled structure protects conductive network from fracture during stretching process, so as to realize the strain-invariant electrical conductivity. Thus, the fabric exhibits a stretchable EMI shielding performance of over 40 dB when subjected to 10-50% uniaxial strains or 21-125% biaxial strains. More importantly, the white TPU/PDMS side and the black AgNW/MXene side enable the fabric passive radiative cooling and heating, respectively. The cooling side exhibits high mid-infrared emissivity (97.5%) and solar reflectance (90%), thus reducing the skin temperature by approximate to 4.9 degrees C. The heating side with high solar absorptivity (86.6%) and photothermal effect increased the skin temperature by approximate to 5 degrees C. Therefore, the fabirc with stretchable EMI shielding and Janus-type dual-mode personal passive thermal management is promising in future wearable products. A Janus-type electrospun TPU/PDMS fabric containing block stacking wrinkled AgNW/MXene conductive network is fabricated via biaxial pre-stretching method. The wrinkled conductive network gives the fabric a strain-invariant EMI shielding performance of over 40 dB. Meanwhile, the Janus-type white TPU/PDMS side and black AgNW/MXene side enable the fabric passive radiative cooling and heating, i.e., dual-mode passive personal thermal management ability.image