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Polymers 2017, 9(3), 80; doi:10.3390/polym9030080

Potassium Iodide-Functionalized Polyaniline Nanothin Film Chemiresistor for Ultrasensitive Ozone Gas Sensing

1
Department of Chemical and Environmental Engineering, University of California-Riverside, Riverside, CA 92521, USA
2
Materials Science and Engineering Program, University of California-Riverside, Riverside, CA 92521, USA
3
Department of Chemical Engineering, Mahidol University, 25/25 Puttamonthon 4 Rd., Nakorn Pathom 73170, Thailand
4
University School of Chemical Technology, Guru Gobind Singh Indraprastha University, Sector 16C, Dwarka, New Delhi 110078, India
*
Author to whom correspondence should be addressed.
Academic Editor: Po-Chih Yang
Received: 20 January 2017 / Revised: 19 February 2017 / Accepted: 21 February 2017 / Published: 24 February 2017
(This article belongs to the Special Issue Polymers for Chemosensing)
View Full-Text   |   Download PDF [1734 KB, uploaded 24 February 2017]   |  

Abstract

Polyaniline (PANI) nanostructures have been widely studied for their sensitivity to atmospheric pollutants at ambient conditions. We recently showed an effective way to electropolymerize a PANI nanothin film on prefabricated microelectrodes, and demonstrated its remarkable sensing performance to be comparable to that of a one-dimensional nanostructure, such as PANI nanowires. In this work, we report further progress in the application of the PANI nanothin film chemiresistive sensor for the detection of ozone (O3) by modifying the film with potassium iodide (KI). The KI-PANI sensor exhibited an excellent sensitivity to O3 (8–180 ppb O3 concentration rage) with a limit of detection of 230 ppt O3, and exquisite selectivity against active chemicals such as nitrogen dioxide (NO2) and sulfur dioxide (SO2). The sensing mechanism of the sensor relied on iodometric chemistry of KI and O3, producing triiodide ( I 3 ) that partially doped and increased electrical conductivity of the PANI film. The sensitivity and selectivity of the KI-functionalized PANI film demonstrates the potential use for KI-PANI-based O3 sensing devices in environmental monitoring and occupational safety. View Full-Text
Keywords: ozone sensor; iodometry; polyaniline; gas sensor; potassium iodide ozone sensor; iodometry; polyaniline; gas sensor; potassium iodide
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Srinives, S.; Sarkar, T.; Hernandez, R.; Mulchandani, A. Potassium Iodide-Functionalized Polyaniline Nanothin Film Chemiresistor for Ultrasensitive Ozone Gas Sensing. Polymers 2017, 9, 80.

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