P2.0.18 Preparation and Humidity Sensing Properties of Silver Oxide Added Bismuth Iron Molybdate

14th International Meeting on Chemical Sensors - IMCS 2012
2012-05-20 - 2012-05-23
Nürnberg/Nuremberg, Germany
P2.0 Metal Oxide-based Sensors
V. Jeseenthairani, J. Dhineshkumar, K. Nagaraja, A. Dayalan, B. Jeyaraj - Department of Chemistry, Loyola Institute of Frontier Energy (LIFE), Loyola College (India)
1319 - 1321


Bi3FeMo2O12 (BFM, Bismuth iron molybdate) was prepared by wet chemical method by using metal nitrates and ammonium molybdate as a precursor and the powder was heated up to 700°C for 24 h. Silver nitrate was added up to 5 and 10 mol % to BFM.compound. BFM:Ag2O3 composites with mol ratios of 100:0 (BFM–1), 95:5(BFM–2) and 90:10 (BFM–3) were prepared and their humidity sensitivity measurements were studied. The composites were characterized by X–ray diffraction (XRD) and Scanning Electron Microscopy (SEM). The surface area measurement was obtained by the nitrogen adsorption/desorption study by BET method. The sensitivity factor Sf was calculated by the ratio of resistances, R5%/R98%, where R5% and R98% are the dc resistances at 5% RH and 98% RH respectively. Response and recovery time were measured by using a degassed glass chamber. The BFM–2 possessed the highest humidity sensitivity of 16798.57±550 while the other two composites possessed a sensitivity factor of 5177.4±180 and 13914.1±350 for BFM–3 and BFM–1, respectively. The surface area of BFM–1, BFM–2 and BFM–3 showed 8.81, 20.66 and 15.79 m2/g respectively. The response and recovery time of BFM–2 was 260 and 180 s respectively.