Multifunctional electromagnetic interference shielding composite fabrics with simultaneous high-efficiency photothermal conversion and Joule heating performance

Purpose This study aims to fabricate a multifunctional electromagnetic interference (EMI) shielding composite fabric with simultaneous high-efficiency photothermal conversion and Joule heating performances. Design/methodology/approach A multifunctional polypyrrole (PPy) hydrogel/multiwalled carbon nanotube (MWCNT)/cotton EMI shielding composite fabric (hereafter denoted as PHMC) was prepared by loading MWCNT onto tannin-treated cotton fabric, followed by in situ crosslinking-polymerization to synthesize three-dimensional (3D) conductive networked PPy hydrogel on the surface of MWCNT-coated cotton fabric. Findings Benefiting from the unique interconnected 3D networked conductive structure of PPy hydrogel, the obtained PHMC exhibited a high EMI-shielding effectiveness vale of 48 dB (the absorbing electromagnetic wave accounted for 84%) within a large frequency range (8.2-12.4 GHz). Moreover, the temperature of the laminated fabric reached 54 degrees C within 900 s under 15 V, and it required more than 100 s to return to room temperature (28.7 degrees C). When the light intensity was adjusted to 150 mW/cm(2), the PHMC temperature was about 38.2 degrees C after lighting for 900 s, indicating high-efficiency electro-photothermal effect function. Originality/value This paper provides a novel strategy for designing a type of multifunctional EMI shielding composite fabric with great promise for wearable smart garments, EMI shielding and personal heating applications.