Inter-digital capacitive ethanol sensor coated with cobalt ferrite nano composite as gas sensing material. (2020)

• Record Type: Journal Article
• Authors: Paul, Jiss; Philip, Jacob
• Is Part Of: Materials today. Volume 25:Part 2(2020)
• Page Start: 148
• Page End: 150
• Publication Date: 2020
• Subjects: Inter-digital capacitive sensor -- Polyvinyl alcohol (PVA) -- CoFe2O4 nanocomposite -- Ethanol Sensor -- Gas response; Materials science -- Congresses -- Periodicals; 620.1
• DOI: 10.1016/j.matpr.2019.12.247
• Languages: English
• ISSNs: 2214-7853

Abstract

Abstract: Sensor design for environmental pollution monitoring is a great challenge, as the selectivity and sensitivity of the sensor for a desired pollutant gas should be high enough to be detected at low concentrations. This work presents an ethanol gas sensor using inter-digital capacitive (IDC) structure coated with Cobalt ferrite (CoFe2 O4 ) nanocomposite as gas sensing material. CoFe2 O4 nanocomposite are prepared by sol gel auto-combustion method. Gas sensing properties of the IDC structure are investigated under various gas concentrations. The sensor exhibits high sensitivity of the order of 100 nF/ppm with a response of 1.4% for ethanol gas at room temperature with a very low gas concentration of 7 ppm, compared to 0.4% and 0.2% respectively for methanol and acetone vapors. The response and recovery times of the sensor are about 180 s. The superior activity of the sensor indicates possible industrial and commercial applications.