In-Situ anchoring of nano-CuS onto PET@PE nonwoven fabrics: developing flexible, robust, and all-in-one integrated thermotherapy films

Thermotherapy, renowned for its non-invasive alleviation of musculoskeletal pain, faces constraints due to the scarcity of flexible and lightweight wearable heating solutions. In this study, we introduce an innovative flexible wearable film designed for effective thermotherapy. The film is engineered by in-situ immobilization of copper sulfide (CuS) nanoparticles onto a bicomponent PET@PE nonwoven fabric, subsequently enhanced through a straightforward hot-pressing process. This method results in an all-in-one integrated PET@PE/CuS film that possesses intrinsic self-enhancement and remarkable photothermal conversion capabilities. Upon exposure to near-infrared (NIR) laser, infrared (IR) therapeutic light, or simulated sunlight, the film maintains stable and precisely regulated temperatures, catering to the optimal thermotherapy temperature range. Its high mechanical robustness and chemical stability, as evidenced by rigorous mechanical and chemical testing, ensure the film's suitability and long-term serviceability in wearable thermotherapy applications. Our study provides an affordable and sustainable strategy for the development of comfortable wearable thermotherapy devices, offering a promising avenue for pain management and rehabilitation.