High fire-safe aerogel with multi-functionality is urgently desirable due to the frequent fire disasters. However, it is still a challenge to afford both excellent flame retardancy and sensitive fire-warning in combustible aerogels. Herein, we fabricated an ultrasensitive fire-warning and high fire-resistance chitosan/montmorillonite/carbon nanotube composite aerogel (CCA) via freeze-drying. Benefiting from the rapid decrease of the electrical resistance for amino-functionalized carbon nanotube when being burned, CCA achieved a hitherto shortest fire-warning response time (~0.25 s). Importantly, the aerogel exhibited excellent flame retardancy and self-extinguished in the vertical burning test. Besides, owing to the hierarchical porous structure of the aerogel and the excellent barrier effect of the montmorillonite nanosheet, CCA could resist a high-temperature flame up to 1200 °C and effectively prevent the temperature of the nonexposed side from increasing, exhibiting excellent thermal insulation. Furthermore, the mechanical resilience, anti-fatigue performance, electrical conductivity, and unique three-dimensional network endowed the aerogel with good piezoresistivity. This work provides a facile, environmentally-friendly, and cost-effective approach to fabricating multifunctional fire-safe aerogel, showing promising applications in exterior wall insulation, vehicle interior, firefighting, and wearable electronics.

由于频繁发生火灾，迫切需要具有多功能的高防火安全气凝胶。然而，在可燃气凝胶中提供优异的阻燃性和灵敏的警告仍然是一个挑战。在这里，我们通过冷冻干燥制备了超灵敏的警告和高阻燃壳聚糖/蒙脱土/碳纳米管复合气凝胶（CCA）。得益于氨基官能化碳纳米管在燃烧时电阻的迅速降低，CCA达到了迄今为​​止最短的火灾响应时间（〜0.25 s）。重要的是，气凝胶在垂直燃烧试验中表现出优异的阻燃性并自熄。此外，由于气凝胶具有分层的多孔结构，并且蒙脱土纳米片具有出色的阻隔效果，CCA可以抵抗高达1200°C的高温火焰，并有效防止未曝光侧的温度升高，并具有出色的隔热性。此外，机械弹性，抗疲劳性能，导电性和独特的三维网络赋予了气凝胶良好的压阻性。这项工作为制造多功能防火安全气凝胶提供了一种简便，环保且具有成本效益的方法，显示出在外墙保温，车辆内部，消防和可穿戴电子产品中的有希望的应用。独特的三维网络赋予气凝胶良好的压阻性。这项工作为制造多功能防火安全气凝胶提供了一种简便，环保且具有成本效益的方法，显示出在外墙保温，车辆内部，消防和可穿戴电子产品中的有希望的应用。独特的三维网络赋予气凝胶良好的压阻性。这项工作为制造多功能防火安全气凝胶提供了一种简便，环保且具有成本效益的方法，显示出在外墙保温，车辆内部，消防和可穿戴电子产品中的有希望的应用。