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Sensors 2017, 17(9), 1995; https://doi.org/10.3390/s17091995

Response of a Zn2TiO4 Gas Sensor to Propanol at Room Temperature

1
Faculty of Engineering, Electrical & Electronics Eng. Department, Sirte University, Sirte, Libya
2
Advanced Processing Technology Research Centre, Dublin City University, Dublin 9, Ireland
*
Author to whom correspondence should be addressed.
Received: 29 June 2017 / Revised: 6 August 2017 / Accepted: 9 August 2017 / Published: 31 August 2017
(This article belongs to the Special Issue Materials and Applications for Sensors and Transducers)
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Abstract

In this study, three different compositions of ZnO and TiO2 powders were cold compressed and then heated at 1250 °C for five hours. The samples were ground to powder form. The powders were mixed with 5 wt % of polyvinyl butyral (PVB) as binder and 1.5 wt % carbon black and ethylene-glyco-lmono-butyl-ether as a solvent to form screen-printed pastes. The prepared pastes were screen printed on the top of alumina substrates containing arrays of three copper electrodes. The three fabricated sensors were tested to detect propanol at room temperature at two different concentration ranges. The first concentration range was from 500 to 3000 ppm while the second concentration range was from 2500 to 5000 ppm, with testing taking place in steps of 500 ppm. The response of the sensors was found to increase monotonically in response to the increment in the propanol concentration. The surface morphology and chemical composition of the prepared samples were characterized by Scanning Electron Microscopy (SEM) and X-Ray Diffraction (XRD). The sensors displayed good sensitivity to propanol vapors at room temperature. Operation under room-temperature conditions make these sensors novel, as other metal oxide sensors operate only at high temperature. View Full-Text
Keywords: gas sensors; XRD; ZnO and TiO2 gas sensors; XRD; ZnO and TiO2
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Gaidan, I.; Brabazon, D.; Ahad, I.U. Response of a Zn2TiO4 Gas Sensor to Propanol at Room Temperature. Sensors 2017, 17, 1995.

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