Issue 20, 2019

Fabrication of a kinetically sprayed CuO ultra-thin film to evaluate CO gas sensing parameters

Abstract

We have introduced a new fabrication process for a CO gas sensor using a kinetically sprayed Cu thin layer, followed by oxidation at 250 °C. The resulting 200 nm-thick CuO thin layer exhibited semi-transparent optical properties. The as-fabricated CO gas sensor was tested under two conditions with varying CO gas concentration ranging from 1000 to 5000 ppm and operating temperatures of 200, 250, and 300 °C: (1) a reaction time of 600 s and a recovery reaction time in an air atmosphere of 1800 s; and (2) a gas reaction time of 1200 s and a recovery time of 7200 s. As a result, the sensor response showed its improvement under a high operating temperature of 300 °C with a reaction time of 600 s and a recovery time of 1800 s regardless of the CO gas concentration. In contrast, the response of the CuO gas sensor showed its maximum value of 0.209 at a lower temperature of 200 °C, due to a sufficient recovery time of 7200 s. Therefore, we have proved that a kinetically sprayed CuO thin layer can be operated with varying CO gas concentration, as well as varying the temperature and time, to be useful as a gas sensor.

Graphical abstract: Fabrication of a kinetically sprayed CuO ultra-thin film to evaluate CO gas sensing parameters

Article information

Article type
Paper
Submitted
18 Jan 2019
Accepted
29 Apr 2019
First published
29 Apr 2019

New J. Chem., 2019,43, 7814-7821

Fabrication of a kinetically sprayed CuO ultra-thin film to evaluate CO gas sensing parameters

D. Choi, H. Kim, M. Son, H. Kim, H. C. Lee and C. S. Lee, New J. Chem., 2019, 43, 7814 DOI: 10.1039/C9NJ00289H

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