Sensors & Transducers Journal
(ISSN 1726- 5479)
Vol. 80, Issue 6, June 2007, pp. 1295-1301
Comparative Study of Moisture Sensing Properties of ZnO Nanomaterials Through Hydroxide Route
by Mixing Dropwise and Sudden
Richa Srivastava, B. C. Yadav*, C. D. Dwivedi, Ritesh Kumar
Nanomaterials and Sensors Research Laboratory
Department of Physics, University of Lucknow,
Lucknow-226007, U.P., India
Received: 30 May 2007 /Accepted: 19 June 2007 /Published: 25 June 2007
Abstract: In this paper we report comparative study of humidity sensing properties of ZnO nanomaterials synthesized through hydroxide route by dropwise and sudden methods. Sodium hydroxide is mixed with zinc sulphate solution at room temperature in the molar ratio 1: 2.2. It yields precipitate of zinc hydroxide. Precipitate is filtered out and washed with deionized water till the sodium ions are not completely removed and its subsequent calcinations give zinc oxide in powder form. We have used two methods such as Method ‘A’ and Method ‘B’. Method ‘A’ stands for ‘Drop wise’ and method ‘B’ stands for ‘Sudden’. For method ‘A’, sodium hydroxide has been mixed ‘Drop wise’ with zinc sulphate and for method ‘B’ it has been mixed ‘Sudden’ with zinc sulphate. For both methods, we get zinc hydroxide precipitate after 24 hours and its subsequent calcinations give zinc oxide nanomaterials in powder form. Pellets of these powders have been made and annealed for 3 hours at temperature 550°C in an electric furnace successively. After annealing, pellets are exposed to humidity and variations in resistances with the variations in humidity have been observed. SEM and XRD studies of samples have been done.
Keywords: Zinc oxide, moisture sensor, nano-size, electrical properties
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