Nano Archive

Tin oxide and zinc oxide based doped humidity sensors

Yawale, Shrikrishna Pandurangji and Yawale, Sangita Shrikrishna and Lamdhade, Gajanan Trymbakapp (2007) Tin oxide and zinc oxide based doped humidity sensors. Sensors and Actuators A: Physical, 135 (2). 388 - 393.

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The semiconducting materials such as stannic oxide (SnO2), zinc oxide (ZnO) doped with titanium oxide (TiO2) and α-alumina (α-Al2O3), are screen-printed in the form of thick film. α-Al2O3 and TiO2 are used as stabilizer and temperature improvement characteristic materials. DC-electrical resistance of the films is measured in presence of humidity. SnO2–5Al2O3 and ZnO–5Al2O3 sensors are found to be good sensing materials for humidity. Rutile and hexagonal structures of SnO2, ZnO and α-Al2O3 and their nano meter grain sizes are responsible for formation of nano meter sized pores, which ultimately adsorbs water. The adsorption of water (physisorbed water) on a hydroxylated surface causes electron injection. The interaction of adsorbed oxygen with water molecules or possibly with chemisorbed water causes energy level of the adsorbed oxygen ions to fluctuate, so that electrons can be more easily injected.

Item Type:Article
Uncontrolled Keywords:Screen-printed humidity sensor; SnO2–TiO2–Al2O3; Water condensation; Electron injection
Subjects:Analytical Science > Nanotechnology for sensing and actuating
Engineering > Nanotechnology applications in ICT
ID Code:4800
Deposited By:SPI
Deposited On:06 May 2009 15:00
Last Modified:06 May 2009 15:00

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