Revolutionizing gas sensors: The role of composite materials with conducting polymers and transition metal oxides

In contemporary world, poisonous gases, gas leaks, and greenhouse gas emissions are all often caused by various societal sectors. It might have an impact on the ecosystem, biodiversity, and human lifestyles all around the world. So, importance of gas sensors is increased. Researchers have often concentrated on gases like NH3, NO2, CO2, LPG, H2, etc. in the history. One potential material for this sensor is the conducting polymer, which has shown great promise in ambient gas detection owing to the fact that its conductive properties can alter by exposing to oxidant or reductant gases. Despite the fact that in specific situations, the presence of additional contaminants such as water, poor sensitivity, low selectivity, etc., may cause declining in the sensing response. Semiconductor gas sensors provide more efficient sensing solutions to overcome these constraints. By adding metal oxides, transition metal oxides, and carbon compounds to conducting polymers (CPs) to create composites, semiconductor gas sensors can be created. The future of gas sensors constructed from composites of conducting polymer (CCP) and transition metal oxide (TMO) is the primary focus of this article. Gas sensing features such as sensitivity, reaction time, and recovery time are illustrated in this summary. We highlight the synthesis techniques for conducting polymer composites with reinforcements consisting of TiO2, FexOx, ZnO, and other transition metal oxides, such as V2O5, NiO, and others, when it comes to their sensing properties. This article provides a concise overview of the latest developments in conducting gas sensors made of nanocomposite polymer and transition metal oxide.