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Vol. 149, No. 2, February 2013, pp. 1-5

 

Bullet

 

NaCl/TiO2 and NaCl/Al2O3 Resistive and Capacitive Humidity Sensors
 

1 Sheyla JIMÉNEZ, 1 Luciana SCARIONI and 2 Kelim VANO

1 Thin Film Laboratory, Department of Physics, Faculty of Science and Technology

University of Carabobo, Naguanagua, 2001 Carabobo, Venezuela

2 Department of Analytical Chemistry, Institute of Inorganic Chemistry, Faculty of Natural Sciences, Leibniz University Hanover, Callinstrasse 1, 30167 Hanover, Germany

Tel.: +58 6004000, fax: +58 0241 8678243,

E-mail: jsheyla@yahoo.com

 

Received: 5 November 2012   /Accepted: 14 February 2013   /Published: 28 February 2013

Digital Sensors and Sensor Sysstems

 

Abstract: The present paper reports pellets of NaCl/TiO2 and NaCl/Al2O3 powder used as resistive and capacitive humidity sensors. Pellets of NaCl mixed with 10 %, 50 % and 80 % of TiO2 and Al2O3 powder have been made by hydraulic pressing machine under a load of 4 tons and were exposed to the humidity in a two pressures humidity generator. It is observed that as %rh increases, there is a decrease in the resistance and an increase in the capacitance for the range of humidity from 45 % to 80 %. The results show that the resistance value decrease and the capacitance value increases with increasing concentration of TiO2 and Al2O3 for the range from 45 % to 80 %RH. The NaCl/TiO2 has a very good scope for developing resistance humidity sensors and the NaCl/Al2O3 for capacitance type humidity sensors for the entire range of humidity. Data obtained by simulation showed reasonable match with the experimental results.

 

Keywords: Resistance, Capacitance, Humidity sensors, Pellets

 

 

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