Nanostructured TiO₂-based gas sensors with enhanced sensitivity to reducing gases

2D TiO 2 thin films and 3D flower-like TiO 2 -based nanostructures, also decorated with SnO 2 , were prepared by chemical and thermal oxidation of Ti substrates, respectively. The crystal structure, morphology and gas sensing properties of the TiO 2 -based sensing materials were investigated. 2D TiO 2 thin films crystallized mainly in the form of rutile, while the flower-like 3D nanostructures as anatase. The sensor based on the 2D TiO 2 showed the best performance for H 2 detection, while the flower-like 3D nanostructures exhibited enhanced selectivity to CO(CH 3 ) 2 after sensitization by SnO 2 nanoparticles. The sensor response time was of the order of several seconds. Their fast response, high sensitivity to selected gas species, improved selectivity and stability suggest that the SnO 2 -decorated flower-like 3D nanostructures are a promising material for application as an acetone sensor.

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