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Design and Fabrication of a Highly Stable Polymer Carbon Nanotube Nanocomposite Chemiresistive Sensor for Nitrate Ion Detection in Water

Mallya, Ashwini N and Ramamurthy, Praveen C (2018) Design and Fabrication of a Highly Stable Polymer Carbon Nanotube Nanocomposite Chemiresistive Sensor for Nitrate Ion Detection in Water. In: ECS JOURNAL OF SOLID STATE SCIENCE AND TECHNOLOGY, 7 (7). Q3054-Q3064.

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Official URL: http://dx.doi.org/10.1149/2.0081807jss

Abstract

Agricultural and industrial wastes cause contamination of groundwater by the accumulation of various organic, inorganic and metallic pollutants including nitrate ions. In this work, a conducting polymer is designed and synthesized to interact specifically with nitrate ions in water. This designed molecule has conjugation in the backbone, also thiourea moiety which interacts and complexes with the analyte nitrate ions by hydrogen bonding. This binding with nitrate ion perturbs the electron distribution along conjugated polymer backbone which translates to change in conductivity of the polymer. This response of the change in conductivity is used as chemosensing. The sensor exhibited stability, repeatability and reproducibility for more than 20 months. The sensor performance is further compared with a nitrate ion selective electrode for real-world sample applications. The electronic property of the polymer and complex and interaction mechanism is elucidated using UV-Visible spectroscopy, dynamic light-scattering analysis and density functional theory calculations. A practically useful lower limit of detection by the present method is similar to 14 ppm NO3--N in pH 7 water. (C) The Author(s) 2018. Published by ECS.

Item Type: Journal Article
Additional Information: Copy right for this article belong to ELECTROCHEMICAL SOC INC, 65 SOUTH MAIN STREET, PENNINGTON, NJ 08534 USA
Department/Centre: Division of Mechanical Sciences > Materials Engineering (formerly Metallurgy)
Depositing User: Id for Latest eprints
Date Deposited: 31 Aug 2018 14:47
Last Modified: 31 Aug 2018 14:47
URI: http://eprints.iisc.ac.in/id/eprint/60538

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