To achieve more selective VOC sensors, surface coatings with well-defined adsorption sites have been used. For instance, metal-organic frameworks (MOFs), crystalline adsorbents with precisely defined pore sizes and functionalities, have been shown to capture VOCs efficiently . Nevertheless, even though MOFs can display pronounced adsorption preferences, aiming only for a specific VOC in a complex mixture while completely avoiding interfering co-adsorption is too optimistic.