How does the MoSe2/TiO2 composite achieve high selectivity for NH3 and DMF?

Label:chem

Topic
Selectivity is crucial for gas sensors to accurately detect specific gases in the presence of other interfering gases. The MoSe2/TiO2 composite is tested for its selectivity towards NH3 and DMF.

From: "MoSe2-based room temperature gas sensor with a sub-parts-per-billion limit for ammonia and N,N-dimethylformamide", Mater. Adv., 2025,6, 2854-2866
Answer
The MoSe2/TiO2 composite achieves high selectivity for NH3 and DMF through its unique electronic structure and adsorption properties. The composite exhibits strong spontaneous adsorption of NH3 and DMF, with adsorption energies of -0.12 eV and -0.09 eV, respectively. This results in a significant response to NH3 and DMF compared to other gases like acetone, ethanol, methanol, propanol, formaldehyde, and N-methyl-2-pyrrolidone.
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