Nilabh, Amit and Sen, Sovandeb and Narjinary, Mousumi and Kundu, Susmita (2020) A novel ppm level ethanol sensor based on La loaded ITO impregnated with Pd and Sb additives. Microchemical Journal, 158. Art No-105146. ISSN 0026-265X

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The present work reports on a novel resistive ppm level ethanol sensor, prepared from nanocrystalline lanthanum loaded indium tin oxide (ITO) impregnated with palladium and antimony additives. A simple unique gel calcination process was adapted to synthesize the nanocomposite powders from their water based precursor salts. This was followed by detailed material characterizations through X-ray diffractometer, FESEM, TEM, EDX and XPS analyses. Fabricated Taguchi type sensor with an optimum concentration of Pd exhibited an excellent sensing performance towards a wide concentration range of (1-100 ppm) ethanol vapour. The sensor showed similar to 87% sensing response for 10 ppm ethanol vapour at an operating temperature of 300 degrees C. Even at 1 ppm concentration, similar to 53% response was observed with fast response and recovery time. The sensing action has been elucidated as the catalytic oxidation of ethanol to carbon di oxide over the La loaded ITO surface layer that resulted in electron transfer to the indium tin oxide site. In addition, synergistic effect of palladium and antimony enhanced the sensing performance as well as reduced the base resistance of the sensor by chemical/electronic sensitization and increasing carrier ion concentration respectively. Comparatively low resistance, negligible cross sensitivity, quick response/recovery time and good long term stability makes the sensor suitable for deployment in practical applications.

Item Type: Article
Subjects: Electronics
Depositing User: Bidhan Chaudhuri
Date Deposited: 22 Jan 2021 11:04
Last Modified: 22 Jan 2021 11:04

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