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Vol. 123, Issue 12, December 2010, pp.91-99

 

Bullet

Humidity Sensing Characteristics of Bi2O3- added TiO2 Composites

 

Vedhakkani JESEENTHARANI, John PRAGASAM, Arunachalam DAYALAN, Karachalacheruvu Seetharamaiah NAGARAJA, *Boniface JEYARAJ

Department of Chemistry, Loyola Institute of Frontier Energy (LIFE),

Loyola College, Chennai 600 034, India

* Tel.:+91- 44 28178200, fax: +91 44 28175566

E-mail: jeseentha@gmail.com, jeyaraj.boniface@gmail.com

 

 

Received: 11 July 2010   /Accepted: 21 December 2010   /Published: 28 December 2010

 

Abstract: The TiO2-Bi2O3 composites heated up to 700 C for 5 h were characterized by X-ray diffraction, and scanning electron microscopy (SEM) and studied for humidity sensor. The composites were in the mole ratio of 98:2, 95:5, 90:10, 80:20 and 100:0 of TiO2 and Bi2O3 labeled as TOBO-1, TOBO-2, TOBO-3, TOBO-4, and TOBO-5, respectively. The samples sintered at 800 oC for 5h formed a new phase Bi2Ti4O11. The composites were subjected to DC resistance measurements as a function of relative humidity (RH) in the range of 5-98 % and the sensitivity factor was calculated from the relation Sf = R5%/R98% where R5% and R98% were the DC resistances of 5 % and 98 % RH respectively. Among the various composites, TOBO-3 composite possessed the highest humidity response with Sf = 2391.3, while the TOBO-5 and TOBO-2 composites possessed low sensitivity factors of 396.2 and 329.7 respectively. The response and recovery characteristics of the TOBO-3 composite were 420 and 150 s respectively.

 

Keywords: TiO2-Bi2O3 composite, Solid-state electrical conductivity, Humidity sensor

 

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