WO3/BTO heterostructures based NO2 sensor with enhanced response characteristics |
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| Authors: | Savita Sharma Monika Tomar Nitin K Puri |
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| Affiliation: | 1. Department of Physics and Astrophysics, University of Delhi, Delhi, India;2. Physics Department, Miranda House, University of Delhi, Delhi, India;3. Department of Applied Physics, Delhi Technological University, Delhi, India |
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| Abstract: | AbstractIn 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. |
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| Keywords: | Nanoclusters spill-over chemical solution deposition gas sensor |
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