Abstract
Our objective was to determine the role of cooling rate on gas-sensing properties of annealed nano-grained nickel ferrite (NiFe2O4). The sol–gel auto combustion method was used for the preparation of NiFe2O4. To estimate structural and microstructural features, X-ray diffraction, and scanning electron microscopy techniques were used. For gas-sensing measurements different volatile organic compounds (VOCs) were used as testing gases. To identify the contribution of the different sensing layer elements to the conduction, ac impedance spectroscopy (IS) measurements were performed. It was found that the sensors cooled with lower rate exhibited better sensing performance, due to increase of resistance. Overall, this article covers an alternative method for modifying nickel ferrite gas sensor sensitivity.
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The study has been supported by the European Social Fund within the project of «Support for the implementation of doctoral studies at Riga Technical University».
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Sutka, A., Stingaciu, M., Mezinskis, G. et al. An alternative method to modify the sensitivity of p-type NiFe2O4 gas sensor. J Mater Sci 47, 2856–2863 (2012). https://doi.org/10.1007/s10853-011-6115-2
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DOI: https://doi.org/10.1007/s10853-011-6115-2