| dc.description.abstract | This study proposes an innovative concept of using Near-Field Electrospinning (NFES) technology to create a self-powered cyclic fire alarm sensor (MPSFS). This technology combines polyvinylidene fluoride-trifluoroethylene (PVDF-TrFE) nanofibers with flexible printed circuit boards (FPCBs), encapsulating them in polydimethylsiloxane (PDMS) to form a piezoelectric nanogenerator (PENG) system. This system is then integrated with Ti3C2Tx MXene/PVP and TPMS structure spacers are added to enhance the output efficiency of the nanogenerator, creating a fire alarm sensor.
We demonstrated the potential of Ti3C2Tx MXene/PVP materials as fire sensors due to their flexibility, excellent flame retardancy, and resistance change characteristics. The MXene-based film, owing to covalent bonds between PVP molecules and MXene sheets, exhibits high flame retardancy, making it suitable for sensitive and reusable fire alarms. Through thermal oxidation treatment, the MXene film transforms into a fish-scale-like C/N mixed titanium dioxide network, enabling it to quickly excite electrons under continuous flame exposure, achieving ultra-fast fire alarm response (about 3.0 seconds) and cyclic fire alarm function. A triply periodic minimal surface (TPMS) structure, which is invariant under a rank-3 lattice of translations and can be easily tunes the mechanical stiffness to enhance the PENG performance, is added as a spacer between the nanogenerator and the MXene/PVP film. By controllably adjusting parameters to generate TPMS structures of different thicknesses and subsequently using compression tests to find the optimal design for use as a spacer in the MPSFS, it was found that 0.2 mm, 0.3 mm, and 0.4 mm thicknesses resulted in 0.2 mm being the thickness with the lowest elastic modulus. This allows for the greatest degree of deformation when pressing the nanogenerator to charge it, and this finding was further validated through subsequent voltage output tests of the nanogenerator with the addition of spacers. Thus, it ensures the charging performance of the MPSFS.
In summary, this study proposes an innovative method to create a small, self-powered fire alarm system using piezoelectric nanogenerators (PENGs), MXene/PVP films, and triply periodic minimal surface (TPMS) structure spacers, achieving efficient energy harvesting and fire monitoring. The MXene/PVP films provide excellent flame retardancy and reusability in fire response, while the introduction of TPMS structures not only enhances the mechanical strength of the system but also improves the charging efficiency of the nanogenerator due to their inherent elasticity. This innovative system significantly reduces fire risk and demonstrates great potential and application prospects in advancing fire safety technology. | en_US |