A wet-chemical process to form palladium oxide sensitiser layer on thin film zinc oxide based LPG sensor |
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| Affiliation: | 1. Empa, Swiss Federal Laboratories for Materials Science and Technology, Laboratory for Joining Technologies & Corrosion, Überlandstrasse 129, 8600 Dübendorf, Switzerland;2. Warsaw University of Technology, Faculty of Materials Science and Engineering, Woloska 141, 02-507 Warsaw, Poland;3. Max Planck Institute for Intelligent Systems, Central Scientific Facility Thin Films, Heisenbergstrasse 3, 70569 Stuttgart, Germany |
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| Abstract: | The liquid petroleum gas (LPG) sensitivity characteristics of zinc oxide (ZnO) films have been studied for an optimised level of Pd loading. The sensor element comprises of a layer of chemically deposited ZnO on which an overlayer of palladium (Pd) sensitiser was formed by a chemical dipping technique. The room temperature resistance of the film was found to be a sensitive function of the quantity of palladium loading, which could be optimised for stable and reproducible sensor properties. The sensor characteristics that are dependent also on the operating temperature could be optimised at around 250 °C. A sensitivity of 88% was observed in presence of 1.6 vol.% LPG in air at this optimum temperature with reasonably fast response and recovery times. |
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