Cascading Photoelectric Detecting and Chemiresistive Gas-Sensing Properties of Pb 5 S 2 I 6 Nanowire Mesh for Multi-Factor Accurate Fire Alarm.

Accurate fire warning is very important for people's life and property safety. The most commonly used fire alarm is based on the detection of a single factor of gases, smoke particles, or temperature, which easily causes false alarm due to complex environmental conditions. A facile multi-factor route for fabricating an accurate analog fire alarm using a Pb 5 S 2 I 6 nanowire mesh based on its photoelectric and gas-sensing dual function is presented. The Pb 5 S 2 I 6 nanowire mesh presents excellent photoelectric detection capabilities and is sensitive to ppm-level NO 2 at room temperature. Under the "two-step verification" circuit of light and gas factors, the bimodal simulation fire alarm based on this Pb 5 S 2 I 6 nanowire mesh can resist the interference of complex environmental factors and effectively reduce the false alarm rate.