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The greenhouse effect is involving global heating and climate change within the world. Carbon dioxide (CO₂) is one of the major gas at the origin of this effect, but also the byproduct of human activity. Therefore, monitoring the indoor/outdoor CO₂ emission by gas sensors is one of the priorities for environmental preservation. In this paper, the sensing performance of CO₂ towards two different O-rich films have been studied; graphene oxide (GO) and vanadium dioxide (VO₂). The preparation of GO film has been carried out by spray pyrolysis on fluorine tin oxide (FTO) prepared by the modified Hummers method. While the VO2 film has been sol-gel spin-coated on a glass substrate. Both films have been characterized using XRD, SEM and electrical properties. The CO₂ gas sensing mechanism and the role of oxygen vacancies in VO₂ are addressing. The oxygen functional groups in GO play a main role in the CO₂ …