Development of an ammonia gas sensor employing an inter-digital capacitive structure coated with Mn0.5Zn0.5Fe2O4 nano-composite. (2022)

• Record Type: Journal Article
• Authors: Paul, Jiss; Philip, Jacob
• Is Part Of: Materials today. Volume 49:Part 5(2022)
• Page Start: 1331
• Page End: 1336
• Publication Date: 2022
• Subjects: Ammonia sensor -- Inter-digital Capacitive Structure -- Mn0.5Zn0.5Fe2O4 nano-composite -- PVD -- XRD; Materials science -- Congresses -- Periodicals; 620.1
• DOI: 10.1016/j.matpr.2021.06.407
• Languages: English
• ISSNs: 2214-7853

Abstract

Abstract: Sensing toxic gases in the atmosphere is a great challenge since the selectivity of the sensor for the desired gas should be high enough to detect the particular gas at the ppm level. This work presents Mn0.5 Zn0.5 Fe2 O4 nano-composite vacuum deposited over an inter-digital capacitive (IDC) structure as an ammonia gas sensing material. The synthesized material is characterized by X-ray diffraction (XRD), Transmission Electron Microscopy (TEM) and Fourier Transform Infrared spectroscopy (FT-IR) to substantiate the crystalline structure and surface morphology of the material. The gas sensing properties of the IDC sensor for ammonia gas are investigated at room temperature. High sensitivity even at extremely low ammonia gas concentrations (of the order of 7 ppm) at room temperature and high selectivity for ammonia gas compared to gases like acetone, ethanol etc., together with low system cost, suggest suitability for developing a new ammonia sensor without using any heating element.