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Vol. 131, Issue 8, August 2011, pp.21-35

 

Bullet

 

 Investigation of Gas-Sensitivity of Metal Oxide Sensors to Nitrogen Monoxide in a Wide Range
of Temperature, Concentration and Humidity of the Air Gas Medium

 

V. V. Malyshev, A. V. Pislyakov

National Research Center “Kurchatov Institute”, Institute of Molecular Physics

E-mail: malyshev@imp.kiae.ru

 

 

 

Received: 1 June 2011   /Accepted: 22 August 2011   /Published: 30 August 2011

Handbook of Laboaratory Measurements book

 

Abstract: Response to NO of six semiconductor metal oxide sensors, made by thick-film technology (pure SnO2, ZnO, WO3 and SnO2 doped with three catalytic additives: 3 wt% La2O3, 1 wt% Sb2O5 + 3 wt% La2O3 and 1 wt% Pt + 3 wt% Pd), was investigated in a dry gas medium at a concentration of 100 ppm NO in a temperature range of 100–600 °С. Concentration dependences of the sensors were investigated at optimum operating temperatures in a range of 0.5–100 ppm NO at relative humidity in a range of 0-100 % RH. It is shown that NO interacted with pure SnO2 and ZnO sensors as well as with SnO2(Pt, Pd) sensor at concentration below 20 ppm both acceptor and donor gas depending on humidity of gas medium. The NO interacted with the other sensors at concentration above 0.5 ppm as acceptor gas only. The possible reactions of NO with surface of the sensors are presented. It is shown that pure WO3 sensor, working at temperature 350 °С, was the best for NO detection. The linear dependences of arithmetic mean values of resistance and response of this sensor from NO concentration are presented.

 

Keywords: Sensor, Humidity, Response to NO, Donor and acceptor gas

 

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