Nano Archive

Sensors for the nitrogen oxides, NO2, NO and N2O, based on In2O3 and WO3 nanowires

Rout, Chandra Sekhar and Ganesh, K and Govindaraj, Achutharao and Rao, C. N. R. (2006) Sensors for the nitrogen oxides, NO2, NO and N2O, based on In2O3 and WO3 nanowires. Applied Physics A: Materials Science & Processing, 85 (3). pp. 241-246. ISSN 0947-8396 (Print) 1432-0630 (Online)

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Abstract

Sensing characteristics of ZnO, In2O3 and WO3 nanowires have been investigated for the three nitrogen oxides, NO2, NO and N2O. In2O3 nanowires of ∼20 nm diameter prepared by using porous alumina membranes are found to have a sensitivity (defined as the ratio of the sensor resistance in the gas concerned to that in air) of about 60 for 10 ppm of all the three gases at a relatively low temperature of 150 °C. The response and recovery times are around 20 s. The sensitivity of these In2O3 nanowires is around 40 for 0.1 ppm of NO2 and N2O at 150 °C. WO3 nanowires of 5–15 nm diameter, prepared by the solvothermal process show a sensitivity of 20–25 for 10 ppm of the three nitrogen oxides at 250 °C. The response and recovery times are 10 s and 60 s, respectively. The sensitivity is around 10 for 0.1 ppm of NO2 at 250 °C. The sensitivity of In2O3 and WO3 nanowires is not affected by humidity even up to 90% relative humidity. The study also reveals that the sensing mechanism for the three nitrogen oxides have a commonality in that the desorption of oxygen is a crucial step in all the cases.

Item Type:Article
Subjects:Physical Science > Nanophysics
Material Science > Nanochemistry
Divisions:Faculty of Engineering, Science and Mathematics > School of Physics
Faculty of Engineering, Science and Mathematics > School of Chemistry
ID Code:3448
Deposited By:JNCASR
Deposited On:20 Jan 2009 10:00
Last Modified:08 Apr 2009 11:45

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