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Vol. 156, Issue 9, September 2013, pp. 304-309




Humidity Sensing Properties and Temperature Conductivity Studies of Sol-Gel Derived Novel Nanomaterials
of Lanthanum Strontium Chromites
1 B. Avila Josephine, 2 V. Jeseentharani, 1 V. Mary Teresita, 1 Mary George, 3* S. Arul Antony

1 Department of Chemistry, Stella Maris College, Chennai-600 086

2 Department of Chemistry, Loyola Institute of Frontier Energy (LIFE), Loyola College, Chennai-600034

3 PG & Research Department of chemistry, Presidency College, Chennai-600 005

1 Tel.: 9840224515, fax: 044-28111129
E-mail: avi_joe@yahoo.com, teres_cvd@yahoo.co.in


Received: 12 June 2013   /Accepted: 25 August 2013   /Published: 30 September 2013

Digital Sensors and Sensor Sysstems


Abstract: Lanthanum strontium chromite mixed metal oxides were prepared by sol-gel method by varying the mole ratios of strontium and chromium in the compound. The compounds were sintered at 700 C for 6 hrs and were subjected to DC resistance measurements at RH 5-98 % and temperature dependent studies. The change in surface conductivity as a function of applied field was measured using picoammeter (Keithely-6485). Among the various mole ratios of compounds LCS-4 shows the highest sensitivity factor of 3.34104 and LCS-1 shows the lowest sensitivity factor 6.6610-1. Response and recovery times were measured. The compounds were characterized by X-ray diffraction, FT-IR, scanning electron microscopy (SEM) and nitrogen adsorption/desorption studies were employed to study the structural phases, vibrational frequencies, surface morphology of the highest humidity sensing compounds.


Keywords: Chemosensors, Chromites, Mixed metal oxide, Relative humidity.


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