Morphology-Engineered CuBiS2 Thin Films for Next-Generation Dual-Gas Sensors

Abstract

In this research, we will present a description in detailed of CuBiS₂ composite films fabricated via a thermal solvent approach for dual gas sensing applications, targeting H₂S and NO₂ gases. The films were systematically analyzed and the results show that the CuBiS₂ films exhibit various advantages such as excellent gas sensing, with excellent performance controlled by operating temperature, film thickness, and surface morphology. The formation of metal-sulfur bonds was revealed and a wide direct band gap of 3.84 eV was determined. Electrical evaluations confirm the p-type conductivity, suggesting their potential application in thermoelectric devices. The membranes exhibit increased sensitivity to H₂S and NO₂ at high temperatures, confirming their potential application in environmental monitoring and industrial safety applications. This research suggests the importance of further optimizing the membrane composition and structural properties to develop sensitivity and selectivity, which will assist in the development of cost-effective and reliable gas sensors in the field of nanomaterials.