Carbon Dioxide Sensors Based on Carbon Nanotubes with and Without Catalyst

Authors Intessar K. Abd1 , Ahmed M. Shano2 , Ebtisam K. Alwan1

1College of Education for Pure Science, Diyala University, Diyala, Iraq

2Bilad Alrafidain University College, Department of Radiological Techniques, Diyala, Iraq

Issue Volume 14, Year 2022, Number 3
Dates Received 24 March 2022; revised manuscript received 22 June 2022; published online 30 June 2022
Citation Intessar K. Abd, Ahmed M. Shano, Ebtisam K. Alwan, J. Nano- Electron. Phys. 14 No 3, 03024 (2022)
PACS Number(s) 07.07.Df
Keywords Carbon nanotubes (14) , CVD (24) , Carbon dioxide, Sensor (27) .

Gas sensors have a wide range of applications in everyday life, whether in industry and medical. A good sensor should be selective, sensitive, responsive, reliable and cost effective. Currently available gas sensors are lacking in one or more of these criteria. In this work, carbon nanotubes (CNTs) with and without catalyst (Fe) are successfully prepared by chemical vapor deposition (CVD) and their structural, surface morphological and sensing properties are studied. The FESEM images clearly indicate that the samples have good CNT diameters of about 140 nm and 45-57 nm with and without catalyst, respectively. The sensing properties of CNTs are investigated as a function of time and operating temperature to find the sensitivity to CO2 gas at different concentrations. High sensitivity (2.68 %) was achieved at 100 (C with a fast response and recovery times at a high concentration of 100 ppm.

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