P2NG.28 - Temperature-dependent NO2 gas sensing study of hydrothermally prepared CuO nanoplatelets
- Event
- 17th International Meeting on Chemical Sensors - IMCS 2018
2018-07-15 - 2018-07-19
Vienna, Austria - Chapter
- P-2 - Nanomaterials for Gas Sensing
- Author(s)
- D. Oosthuizen, D. Motaung - DST/CSIR National Centre for Nano-structured Materials, Council for Scientific Industrial Research, Pretoria (South Africa), H. Swart - Department of Physics, University of the Free State, Bloemfontein (South Africa)
- Pages
- 897 - 898
- DOI
- 10.5162/IMCS2018/P2NG.28
- ISBN
- 978-3-9816876-9-9
- Price
- free
Abstract
Development of gas sensors operating at low temperature, <100 °C, utilizing p-type CuO nanoplatelets for indoor air quality monitoring with excellent response, high sensitivity and good reliability are highly desirable. Therefore, herein, the A2-CuO-based sensors, CuO sensing layer prepared for 12 hours at 120 °C, revealed a remarkable response of 697, sensitivity of 10.9 ppm−1 and speedy response time of 70 s towards 40 ppm NO2 at 100 °C. An increased amount of point defects was observed when subject to photoluminescence studies at temperatures of 50 and 100 °C. The findings affirmed that such sensor response/sensitivity is dependent on the specific surface area and point defects and the average crystallite size.