Integrating self-powering and electromagnetic interference shielding into MXene-based fire-sensing films via hetero-interface engineering
Year: 2025
Type: article
Abstract: MXene-based fire-sensing films are expected to integrate self-powered fire monitoring and excellent electromagnetic interference (EMI) shielding for electronic devices. However, quantum interlocking of thermoelectric and charge transport in high-dimensional degenerate MXene limits their synergistic enhancement. Here, a multifunction-integration strategy was proposed by regulating competition of Seebeck coefficient and conductivity on carrier concentration, based on hetero-interface engineering of hierarchical “brick/mortar” structure. This structure with gradient impedance matching was designed by sandwiching an MXene inner layer between two hybrid-nanoparticle outer layers, which are assembled by tunicate cellulose nanocrystals (tCNCs) and ammonium polyphosphate (APP) inserting into MXene nanosheets (MAC) through hydrogen bonds and electrostatic interactions. The obtained 1.2 mm self-powered composite film (MAC@MX40) generates a maximum Seebeck voltage of 6.2 mV to trigger an alarm signal lasting over 113.28 s within 2.74 s upon exposure to flame without external power. An excellent absorption-domainance EMI shielding effectiveness of 64.3 dB within the frequency range of 8.2–12.4 GHz (X-band) is achieved, consistent with the result of finite element simulation. The good Joule heating capacity is confirmed by a tunable saturation temperature of 20–114 °C within 100 s under voltages 1–5 V. The tensile strength of 80.9 MPa and elongation at break of 5.9 % are also achieved, respectively increasing 99.9 % and 4.1 % compared to the MXene counterpart. This multifunction strategy simultaneously enables MXene-based films to be self-powered fire-sensing and EMI shielding for better life and property protection.
Authors: Yi He, Jiyong Wen, Lin Gan, Jin Huang
Institutions: Shihezi University, Southwest University
Language: English
Subfield: Materials Chemistry
Field: Materials Science
Domain: Physical Sciences
Open Access status: hybrid
Estimated APC paid: $1,600
OpenAlex ID: W4412662223