What is the mechanism behind the gas sensing performance of the MoSe2/TiO2 composite?

Label:chem

Topic
Understanding the sensing mechanism is essential for optimizing the performance of gas sensors. The MoSe2/TiO2 composite operates based on changes in electrical conductance due to the adsorption of gas molecules.

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 sensing mechanism of the MoSe2/TiO2 composite involves the adsorption of gas molecules (NH3 and DMF) on the surface, leading to charge transfer between the gas molecules and the composite. This charge transfer modulates the electronic properties of the composite, resulting in measurable changes in resistance. For NH3, the adsorption is exothermic and involves the release of electrons into the conduction band, reducing the sensor's resistance. For DMF, the adsorption also leads to a decrease in resistance due to electron transfer, enhancing the sensor's sensitivity.
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