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Morphological and humidity sensing characteristics of SnO2-CuO, SnO2-Fe2O3 and SnO2-SbO2 nanocooxides

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Abstract

This paper reports the synthesis of SnO2-CuO, SnO2-Fe2O3 and SnO2-SbO2 composites of nano oxides and comparative study of humidity sensing on their electrical resistances. CuO, Fe2O3 and SbO2 were added within base material SnO2 in the ratio 1: 0.25, 1: 0.50 and 1: 1. Characterizations of materials were done using SEM and XRD. SEM images show the surface morphology and X-ray diffraction reveals the nanostructure of sensing materials. The pellets were annealed at 200, 400 and 600°C respectively for 3 h and after each step of annealing, observations were carried out. It was observed that as relative humidity (%RH) increases, there was decrease in the resistance of pellet for the entire range of RH. Results were found reproducible. SnO2-SbO2 shows maximum sensitivity for humidity (12 MΩ/%RH) among other composites.

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Authors and Affiliations

  1. Nanomaterials and Sensors Research Laboratory, Department of Physics, Lucknow University, Lucknow, 226 007, India

    B. C. Yadav & Preeti Sharma

  2. Nanoscience Laboratory, Centre for Materials for Electronics Technology (C-MET), Off Dr. Homi Bhabha Road, Panchawati, Pune, 411 008, India

    P. K. Khanna

Authors
  1. B. C. Yadav
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  2. Preeti Sharma
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  3. P. K. Khanna
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Correspondence to B. C. Yadav.

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Yadav, B.C., Sharma, P. & Khanna, P.K. Morphological and humidity sensing characteristics of SnO2-CuO, SnO2-Fe2O3 and SnO2-SbO2 nanocooxides. Bull Mater Sci 34, 689–698 (2011). https://doi.org/10.1007/s12034-011-0183-4

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  • DOI: https://doi.org/10.1007/s12034-011-0183-4

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