Simultaneous Detection of CO and NH3 Gases at Room Temperature with an Array of ZnS Chemiresistive Sensors and the Superposition Principle

Kanaparthi, Srinivasulu and Singh, Shiv Govind (2022) Simultaneous Detection of CO and NH3 Gases at Room Temperature with an Array of ZnS Chemiresistive Sensors and the Superposition Principle. Analytical Chemistry, 94 (11). pp. 4602-4609. ISSN 0003-2700

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Simultaneous detection of multiple toxic gases in the air using room temperature gas sensors is significant in low-power environmental monitoring applications. However, the low-temperature resistive gas sensors are sensitive to more than one gas, and thus, an array of gas sensors and high energy-consuming machine learning algorithms are required to predict the concentrations of the individual gases in mixed target gas. Here, we report a computationally less intensive method to predict the composition of the target gases using linear gas sensors. A sensor array consisting of two ZnS resistive gas sensors biased at different voltages in conjunction with the superposition principle is used to predict the concentration of individual gases in the binary mixture of NH3 and CO present in the air. Further, the effect of humidity on response is mitigated by formulating the sensitivity of the sensors as a function of relative humidity. The proposed algorithm predicted the concentration of the individual gases in mixed gas with a maximum absolute error of ∼15% irrespective of humidity levels, which is practically allowed in most gas sensing applications. As the superposition principle is a low-power consuming technique, the proposed approach can be used in applications where trace levels of gases in mixed targets need to be detected with energy-efficient methods. © 2022 The Authors. Published by American Chemical Society.

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IITH Creators:
IITH CreatorsORCiD
Singh, Shiv Govind
Item Type: Article
Additional Information: This research is supported by the Department of Biotechnology, under the Ministry of Science and Technology, India, Grant Number: BT/PR22239/NNT/28/1269/2017.
Uncontrolled Keywords: Chemiresistive sensors; Environmental Monitoring; Low Power; Power environmental; Resistive gas sensors; Room temperature gas sensor; Simultaneous detection; Superposition principle; Target gas; Toxic gas
Subjects: Electrical Engineering
Divisions: Department of Electrical Engineering
Depositing User: . LibTrainee 2021
Date Deposited: 27 Jul 2022 05:48
Last Modified: 27 Jul 2022 05:48
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