A recent study from laboratory of Günther Rupprechter shows that operando spectroscopy can also be used to investigate the performance of VOC sensing semiconductor nanomaterials. To demonstrate this, operando  spectroscopy was applied to directly investigate the room temperature detection of methanol by metal oxide semiconductor composites (mainly Anatase titanium dioxide nanoparticles with reduced graphene oxide) in gas sensors. Operando-DRIFTS along with resistance measurements, were employed to examine methanol interactions with the sensors. Moreover, mass spectroscopy (MS) with resistance measurements revealed surface electrochemical reactions. Overall, operando spectroscopy findings showed that the nanocomposite sensor's mechanism involves a combination of reversible physisorption and irreversible chemisorption of methanol, sensor modification over time, and electron/oxygen depletion and restoration, resulting in the formation of carbon dioxide and water.