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Demonstrates rapid CO detection in dual-mode fire warning system, suggesting improved safety.
Highlights A biomimetic gradient porous core–shell fiber with enhanced gas-sensing capabilities for CO-temperature early fire warning is fabricated via a coaxial wet-spinning technology. The gradient porous sheath with SnO 2 /In 2 O 3 heterojunction endows enhanced CO gas-sensing performance with high sensitivity, low detection limit and improves the CO respond of by 15%. The CO-temperature dual-mode sensing fiber integrated with a wireless early fire-warning system achieves a rapid respond to fire in ~3 s and detects 10 ppm CO gas within 19 s.
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Huang et al. (2026) studied this question.
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