Flexible Stretchable Electrothermally/photothermally Dual-driven Heaters from Nano-embedded Hierarchical CuS-Coated PET Fabrics for All-weather Wearable Thermal Management

The multifunctional photoelectronic devices are recently attracting much more attention due to their potential enlarged applications. The flexible stretchable electrothermally/photothermally dual-driven heaters for all-weather wearable thermal management are presented in this work with nano-embedded hierarchical CuS-coated PET fabrics. Herein, the hierarchical nano-embedded CuS film is fabricated via a simple chemical bath method for high electrical conductivity and highly efficient inelastic collision of electro/photo-generated carriers. The hierarchical nano-embedded CuS morphology produces the low sheet resistance of 1.26 Ω sq and the super low total heat transfer coefficient of 3.256 × 10 W/C·mm, which lead to the high-efficient electro/photo-dual-driven heating effect in the CuS@PET fabrics. The saturated temperature on the as-fabricated flexible wearable heaters reaches up to 172 °C. The thermal conversion devices also bear the excellent stability, reproducibility, stretchability, controllability and corrosion-resistant characteristics. Interestingly, their excellent thermal conversion performance could be achieved by freely exchanging the driving power sources, such as electricity-supplying equipment, 635-nm laser, infrared physiotherapy lamp and solar simulator, which provides a necessary precondition for the all-weather applications of flexible wearable heaters. The as-fabricated electro/photo-dual-driven heaters on the CuS@PET fabrics have the promising applications in wearable electronics, all-weather self-heating facilities, out/in-vivo physiotherapy, and so on.