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Abstract
In the present work, an efficient NO2 gas sensor has been realised using single phase Barium titanate, BaTiO3, (BTO) thin film, grown by chemical solution deposition technique (CSD). The gas sensing characteristics of BTO thin film were enhanced by integrating WO3 modifier in the form of uniformly distributed circular nano-clusters and continuous overlayer. The WO3 nanoclusters/BTO sensing element exhibited enhanced sensor response (∼156) with fast response speed (16 s) at a relatively low operating temperature (140 °C) towards 50 ppm NO2 gas. An attempt has been made to explain the sensing mechanism involving the twin effect of “Fermi-level exchange mechanism” and “spill over mechanism” upon interaction with target NO2 gas. The obtained results in the present work are encouraging for the realization of hand-held NO2 gas sensor.
Funding
The authors are thankful to the Gas Authority of India Limited (GAIL) and Department of Science & Technology (DST) for financial support to carry out this work. One of the author (SS) is thankful to the Delhi Technological University (DTU) for teaching assistantship.