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

• Published in: Advanced functional materials Vol. 34; no. 13
• Main Authors: Dong, Jingwen, Feng, Yuezhan, Lin, Kang, Zhou, Bing, Su, Fengmei, Liu, Chuntai
• Format: Journal Article
• Language: English
• Published: Hoboken Wiley Subscription Services, Inc 01.03.2024
• Subjects: Absorptivity; Cooling; Electrical resistivity; Electromagnetic interference; Electromagnetic shielding; Electrospinning; Heating; MXenes; Nanowires; Polydimethylsiloxane; Polyurethane resins; Skin temperature; Spraying; Stretchability; Stretching; Thermal management; Urethane thermoplastic elastomers; Wearable technology
• ISSN: 1616-301X; 1616-3028
• DOI: 10.1002/adfm.202310774

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)/Ti 3 C 2 T x 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 ≈4.9 °C. The heating side with high solar absorptivity (86.6%) and photothermal effect increased the skin temperature by ≈5 °C. Therefore, the fabirc with stretchable EMI shielding and Janus‐type dual‐mode personal passive thermal management is promising in future wearable products.