Adsorption is a process in which molecules adhere to the surface of a solid phase. Various theoretical models describe this phenomenon depending on the surface properties and the chemical identity of the adsorbate. Adsorption plays a significant role in numerous fields, including electronic sensing. This article presents the Langmuir adsorption model, its modifications, and a comparison with experimental data. Furthermore, the role of adsorption in capacitive gas sensors is examined, focusing on a electronic nose device developed at Jožef Stefan Institute. Finally, potential improvements using porous materials such as metal-organic frameworks are discussed, highlighting their potential for enhancing sensitivity and selectivity in future sensor designs.

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