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Title: Ammonia sensing properties of V-doped ZnO:Ca nanopowders prepared by sol–gel synthesis

V-doped ZnO:Ca nanopowders with different V loading were prepared by sol–gel synthesis and successive drying in ethanol under supercritical conditions. Characterization data of nanopowders annealed at 700 °C in air, revealed that they have the wurtzite structure. Raman features of V-doped ZnO:Ca samples were found to be substantially modified with respect to pure ZnO or binary ZnO:Ca samples, which indicate the substitution of vanadium ions in the ZnO lattice. The ammonia sensing properties of V-doped ZnO:Ca thick films were also investigated. The results obtained demonstrate the possibility of a fine tuning of the sensing characteristics of ZnO-based sensors by Ca and V doping. In particular, their combined effect has brought to an enhanced response towards NH{sub 3} compared to bare ZnO and binary V-ZnO and Ca-ZnO samples. Raman investigation suggested that the presence of Ca play a key role in enhancing the sensor response in these ternary composite nanomaterials. - Graphical abstract: V-doped ZnO:Ca nanopowders prepared by sol–gel synthesis possess enhanced sensing characteristics towards NH{sub 3} compared to bare ZnO. - Highlights: • V-doped ZnO:Ca nanopowders with different V loading were prepared by sol–gel synthesis. • Raman features of V-doped ZnO:Ca samples indicate the substitution of V ions in themore » ZnO lattice. • Combined effects of dopants have brought to an enhanced response to NH{sub 3} compared to ZnO. • Ca play a key role in enhancing the sensor response of ternary V-doped ZnO:Ca composites.« less
Authors:
 [1] ; ;  [2] ;  [3] ;  [2] ;  [4] ; ; ;  [1] ; ;  [5] ;  [5]
  1. Dipartimento di Fisica e di Scienze della Terra, Università di Messina, Viale Ferdinando Stagno d’Alcontres 31, I-98166 Messina (Italy)
  2. Laboratory of Physics of Materials and Nanomaterials Applied at Environment, Faculty of Sciences in Gabes, 6072 Gabes (Tunisia)
  3. (Italy)
  4. (IMSIU), College of Sciences, Department of Physics, Riyadh 11623 (Saudi Arabia)
  5. Dipartimento di Ingegneria Elettronica, Chimica e Ingegneria Industriale, Università di Messina, Viale Ferdinando Stagno d’Alcontres 31, I-98166 Messina (Italy)
Publication Date:
OSTI Identifier:
22475654
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Solid State Chemistry; Journal Volume: 226; Other Information: Copyright (c) 2015 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY; AMMONIA; ANNEALING; COMPARATIVE EVALUATIONS; DOPED MATERIALS; DRYING; ETHANOL; FILMS; LOADING; NANOMATERIALS; NANOSTRUCTURES; POWDERS; RAMAN SPECTROSCOPY; SENSORS; SOL-GEL PROCESS; SYNTHESIS; VANADIUM IONS; ZINC OXIDES