Easy networking enhanced quantum wires-based fiber probe for highly sensitive NH3 gas detection at room temperature

The detection of toxic ammonia (NH3) gas across multiple channels at room temperature, especially under complex conditions, consistently presents a significant challenge. In this paper, a plasmonic Pt-doped SnO2 enhanced quantum wires NH3 gas sensor is constructed on a 125-mu m communication fiber with easy networking. To enhance usability in confined areas, the sensor features a compact plug-in fiber probe design. The plasmonic Pt-doped SnO2 enhanced quantum wires coating boosts the interaction between NH3 gas molecules and oxygen adsorbed on the wires' surface, modulating the plasmonic optic signal. We present and compare two optical modulation methods-wavelength and intensity-for our NH3 gas probe. Our sensor achieves an impressive intensity sensitivity of -10.45 a.u./ppm at room temperature with a rapid response time of 3.8 s. Furthermore, intensity modulation offers an exceptionally low detection limit of 287 ppb, with minimal susceptibility to temperature and humidity variations. The proposed fiber NH3 gas probe exhibits commendable specificity, repeatability, stability, and cost-effectiveness, along with flexibility in light source and receiver choices, making it ideal for NH3 gas detection applications.