Facet‐engineered <scp>BiSI</scp> nanorods for intelligent distinguishing detection of <scp> NO ₂ </scp> / <scp> H ₂ S </scp> mixed gas

Abstract Room‐temperature detection of harmful gases is essential for industrial intelligence, whereas the development of practical multigas sensors for real‐world applications remains insufficient. Guided by density functional theory calculations, which reveal the superior adsorption and charge‐transfer capability of the BiSI (121) facet toward both NO 2 and H 2 S, a facet‐engineered BiSI nanorod sensor was designed to achieve bifunctional sensing, exhibiting remarkable responses of 610% and −437% to 1 ppm NO 2 and H 2 S at room temperature, respectively. Further integration of the single facet‐controlled BiSI sensor with a back‐propagation neural network allows for the intelligent analysis of mixed gases, achieving both distinguishing detection and concentration prediction. This systematic design effectively overcomes the limitations of high‐power consumption and complex modulated operating conditions. This strategy provides a low‐power and integrated generalizable framework for simultaneous multigas detection, applicable to a wide range of industrial and environmental monitoring scenarios. image