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Journal of Sensor Technology, 2011, 1, 116-124 doi:10.4236/jst.2011.14016 Published Online December 2011 (http://www.SciRP.org/journal/jst) Synthesis and Humidity Sensing Investigations of Nanostructured ZnSnO3 Rama Singh, Avadhesh Kumar Yadav, Chandkiram Gautam Department of Physics, University of Lucknow, Lucknow, India E-mail : yadav.av 11@ Received August 31, 2011; revised October 14, 2011; accepted October 29, 2011 Abstract In this paper zinc stannate (ZnSnO ) nanoparticles was synthesized by a chemical precipitation method. The 3 synthesized samples were characterized using X-ray powder diffraction (XRD), Differential scanning calo- rimetry (DSC) and UV-Visible absorption spectroscopy. Sensing material was made as pellet by hydraulic press machine under uniform pressure of 616 MPa. Then the material was annealed at 600˚C. Surface mor- phologies of the samples were analyzed using Scanning electron microscopy (SEM) for pellet of different weight ratio annealed at 600˚C. The XRD pattern indicates that ZnSnO3 has a perovskite phase with an or- thorhombic structure having minimum crystallite size 4 nm. Further, humidity sensing investigations of these sensing materials were done. Our result indicate that ZnSnO3 in form of pellet annealed at 600˚C for 1:4 weight ratio was most sensitive of humidity in comparison to pure SnO2 under same conditions. Maximum sensitivity of the sample was 3 GΩ/% RH which is better in comparison to pure SnO2 . The results were re- producible up to ± 77% after 2 months of observations. Keywords: Zinc Stannate, SEM, XRD, UV-Visible Absorption Spectroscopy, Humidity 1. Introduction oxide nanostructures havin