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Nanostructured metal oxides thin films as high-quality humidity sensor
4th International Conference on Nanotek & Expo
December 01-03, 2014 DoubleTree by Hilton Hotel San Francisco Airport, USA
Richa Srivastava
Scientific Tracks Abstracts: J Nanomed Nanotechnol
Abstract:
Present paper deals synthesis and characterizations of nanostructured metal oxides like La2O3, Nd2O3, Nb2O5, ZnO and ferrites akin to Fe2O3, NiFe2O4 ZnFe2O4 and CuFe2O4. The sensing materials were characterized by SEM, XRD and UVVisible spectroscopy. The thin films of synthesized materials were prepared by using sol-gel spin coating techniques on saperate alumina substrates. Also for compartive observations, the thick films and pellets of materials were fabricated by using screen printing technology and hydraulic pressing machine. After it their humidity sensing properties were investigated. The variations of resistance with %RH of the different sensing elements were measured. Out of all investigated material, the thin film of ZnFe2O4 gave maximum average sensitivity 50 MΩ/%RH with ?1% hysteresis and the results were found to be reproducible after three months with ?2% hysteresis. These experimental results identifies that fabricated nanostructured thin film of ZnFe2O4 is excellent sensing elements for humidity sensing.