Alternatively, dichalcogenides of the Sn-Se-S system have shown promising detection properties for various detection systems due to their lamellar crystal structure . In these materials, chemically inert layers bonded by weak van der Waals interactions promote a high surface-to-volume ratio, exposing lone pair electrons in the (0 0 1) planes. These characteristics make them promising to detect the presence of small levels of gases in the atmosphere, allowing the development of physisorption sensor devices that operate close to room temperature . Furthermore, chalcogenide elements are abundant, providing additional motivation for investigating their performance as gas sensors .