A Resistive Type Humidity Sensor Based on ZnO-SnO2 Nanocomposite

Karunesh Tiwari; N. K. Pandey; Alok Kumar

doi:10.1117/12.924796

15 October 2012 A resistive type humidity sensor based on ZnO-SnO₂ nanocomposite

Karunesh Tiwari, N. K. Pandey, Alok Kumar

Author Affiliations +

Proceedings Volume 8549, 16th International Workshop on Physics of Semiconductor Devices; 854916 (2012) https://doi.org/10.1117/12.924796
Event: 16th International Workshop on Physics of Semiconductor Devices, 2011, Kanpur, India

Abstract

Paper reports a resistive type humidity sensing studies of ZnO-SnO₂ nanocomposite powder pellets prepared through solid-state reaction route. When exposed to humidity, resistance of pellets decreases with increase in relative humidity from 10 to 90%. Sensing element with 25 weight% of SnO₂ in ZnO shows best results with maximum sensitivity of 1.25 MΩ/%RH in 10- 90% relative humidity range. This sensing element manifests smallest crystallite size of 60 nm as measured from XRD and lowest grain size of 92 nm calculated from SEM micrograph. This sensing element manifests low hysteresis, less effect of ageing and good reproducibility. The response and recovery time of sensing element SZ-25 is found to be 92 and 480 seconds respectively.

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Karunesh Tiwari, N. K. Pandey, and Alok Kumar "A resistive type humidity sensor based on ZnO-SnO₂ nanocomposite", Proc. SPIE 8549, 16th International Workshop on Physics of Semiconductor Devices, 854916 (15 October 2012); https://doi.org/10.1117/12.924796

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