MXene Nanosheet/Aramid Nanofiber Sandwich Films for Fire Warning Applications

Early fire alarm sensors play a critical role in preventing potential fire accidents. However, most current fire alarm materials are limited by their high activation temperature and low sensitivity. In this study, a flexible sandwich-like film (AMA) was developed using vacuum-assisted self-assembly and hot-pressing technology with aramid nanofibers (ANF) and MXene. This film exhibits ultrahigh sensitivity to both low temperatures and flames and has long-lasting fire warning capabilities with a rapid response time (400 ms) and a continuous alarm signal (∼900 s) under the attack of flame. Compared to existing technologies, the AMA film offers significantly enhanced flexibility, superior thermal stability, and broader temperature sensitivity. These advancements address the limitations of narrow temperature monitoring ranges and slow response times in traditional fire alarm materials, positioning the AMA film as a promising candidate for next-generation fire safety applications.