Rational Design of Amorphous Carbon-Coated Laminar-Structured Wood for Integrating Repeatable Early Fire Detection and High-Temperature Affordable Flexible Pressure Sensing in One System

High-temperature affordable flexible polymer-based pressure
sensors
integrated with repeatable early fire warning service are strongly
desired for harsh environmental applications, yet their creation remains
challenging. This work proposed an approach for preparing such advanced
integrated sensors based on silver nanoparticles and an ammonium polyphosphate
(APP)-modified laminar-structured bulk wood sponge (APP/Ag@WS). Such
integrated sensors demonstrated excellent fire warning performance,
including a short response time (minimum of 0.44 s), a long-lasting
alarm time (>750 s), and reliable repeatability. Moreover, it achieved
high-temperature affordable flexible pressure sensing that exhibited
an almost unimpaired working range of 0–7.5 kPa and a higher
sensitivity (in the low-pressure range, maximum to 226.03 kPa–1) after fire. The high stability was attributed to
reliable structural elasticity, and the wood-derived amorphous carbon
is capable of repeatable fire warnings. Finally, a Ag@APP/WS-based
wireless fire alarm system that realized reliable house fire accident
detection was demonstrated, showing great promise for smart firefighting
application.