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Influence of particle size on H2 and H2S sensing characteristics of nanocrystalline zinc ferrite

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Abstract

Nanocrystalline zinc ferrite ZnFe2O4 was synthesized by sol–gel self-combustion technique. Ball milling at room temperature was carried out to control the particle size. Characterization of synthesized powders was made using X-ray diffraction and transmission electron microscopy analysis. Fine powders resulted from milling were used to prepare gas sensing elements in pellet form. The gas-sensing properties were studied in presence of hydrogen and hydrogen sulphide as test gases. The gas response behavior was found to be strongly influenced by the particle size. Significantly high sensitivity of ~82 % was found for ~7 nm zinc ferrite in presence of 200 ppm H2S at an operating temperature of 150 °C. Sensitivity was found to increase with temperature before being maximum at a particular operating temperature.

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Acknowledgments

One of the authors acknowledges University Grants Commission (UGC), India for providing financial support through a major project [F. No. 41-849/2012(SR)] for carrying out the work. The authors acknowledge the kind support of Dr. K. K. Chattopadhyay, Department of Physics, Jadavpur University, West Bengal, India for the TEM images.

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  1. Department of Physics, The University of Burdwan, Bardhaman, West Bengal, India

    P. Ghosh, M. R. Das & P. Mitra

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  1. P. Ghosh
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  2. M. R. Das
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  3. P. Mitra
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Correspondence to P. Mitra.

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Ghosh, P., Das, M.R. & Mitra, P. Influence of particle size on H2 and H2S sensing characteristics of nanocrystalline zinc ferrite. Indian J Phys 90, 1367–1373 (2016). https://doi.org/10.1007/s12648-016-0888-8

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