Flexible Ag@graphene/polyimide film for electrothermal, photothermal, and EMI shielding

Flexible Ag@GNP/PI film is fabricated via in-situ polymerization. • Ag bridge conductive gaps between GNPs within the PI matrix. • The film exhibits multifunction performances for thermal management. With the vigorous development of the new energy, integrated circuit and intelligent robot industries, the development of thermal management film materials with multifunctional characteristics such as electrothermal conversion, photothermal response and electromagnetic shielding is of crucial application prospects. To meet these demands, we pioneer flexible silver particles@ graphene nanosheets/polyimide multifunctional films (Ag@GNP/PI) fabricated via in-situ polymerization. Ag bridge conductive gaps between GNPs within the PI matrix, enabling excellent dual-mode photothermal-electrothermal efficiency, presents excellent Joule heating performance including wide temperature range (30–81.1 °C), safe operating conditions (2–4.5 V) and photothermal performance including rapid thermal response (reaching at 60 °C within 120 s at 1 sun). The film also exhibited an excellent thermal management capability for Li-ion battery. The structure simultaneously ensures flexibility, flame resistance, and maintains EMI shielding >30 dB. This integrated design surpasses conventional single-function materials, enabling next-generation smart thermal management. Download: Download high-res image (142KB) Download: Download full-size image