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

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

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/TiO₂has a very good scope for developing resistance humidity sensors and the NaCl/Al₂O₃for 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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