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SnO2 Nanoparticles: Preparation, Characterization and Humidity Sensor Application

CH. Ashok, K. Venkateswara Rao, CH. Shilpa Chakra, K. Ganapathi Rao, N. Sudheer Kumar


The microwave-assisted synthesis method is used to prepare SnO2 nanoparticles for the application of humidity sensor, because of oxygen vacancy in the lattice. Microwave-assisted method is very simple, low cost and rapid heating method. Room temperature ionic liquids and tin source were used in the reaction as precursors. The obtained SnO2 nanoparticles were characterized by X-ray diffractometer, particle size analyser, Fourier transform infrared spectroscope, and thermo gravimetric-differential thermal analyser. The humidity sensor application was investigated by digital electric meter. The SnO2 nanoparticles confirmation was done by XRD and the average crystallite size was 28 nm. The strong stretching bond observed at 880 cm-1 confirmed the nanoparticles formation. The weight loss of the material observed as 3.7%, infers the high stability of nanoparticles. The resistance value of the SnO2 nanoparticles decreases along with increasing of relative humidity; because of this reason, the sensitivity of the nanoparticles increased.


SnO2nanomaterial, microwave-assisted method, XRD, FTIR, TGA, humidity sensor

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