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Ethanol Sensing Properties of Pure and Ag Nano Particles-Doped Zinc Oxide with Noble Metal Catalytic Contacts

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Pure ZnO and Ag-doped ZnO bulk sensors are fabricated to study the effects of two different catalytic noble metal contacts. Silver nano particles, are mixed with zinc oxide powder and then sintered at 860 C. Silver paste and Pt wire are used as catalytic contact for the bulk ZnO sensors. The sensors are compared for improvement in sensitivity and response and recovery time for detecting ethanol gas. The resistance of the bulk ZnO sensors are increased with Pt contacts compared to Ag contact. Pt contact exhibited a higher sensitivity and faster response and recovery time than sensors with Ag contacts in similar conditions. Ag nano particles dopant causes advantage of shorter response and recovery time than pure samples although it caused some decrease in sensitivity.

Keywords: AG NANO PARTICLES; CATALYTIC CONTACT; CHEMICAL AND ELECTRONIC SENSITIZATION; FASTER RESPONSE AND RECOVERY TIME; GAS SENSOR

Document Type: Research Article

Publication date: December 1, 2010

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