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Sensors 2015, 15(10), 26866-26876; doi:10.3390/s151026866

Sensors for Highly Toxic Gases: Methylamine and Hydrogen Chloride Detection at Low Concentrations in an Ionic Liquid on Pt Screen Printed Electrodes

Nanochemistry Research Institute, Department of Chemistry, Curtin University, GPO Box U1987, Perth 6845, WA, Australia
Present address: Department of Materials, Parks Rd, Oxford OX1-3PH, UK.
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Author to whom correspondence should be addressed.
Academic Editor: Xiangqun Zeng
Received: 24 September 2015 / Revised: 15 October 2015 / Accepted: 19 October 2015 / Published: 22 October 2015
(This article belongs to the Special Issue Ionic Liquids)
View Full-Text   |   Download PDF [1218 KB, uploaded 27 October 2015]   |  

Abstract

Commercially available Pt screen printed electrodes (SPEs) have been employed as possible electrode materials for methylamine (MA) and hydrogen chloride (HCl) gas detection. The room temperature ionic liquid (RTIL) 1-ethyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide ([C2mim][NTf2]) was used as a solvent and the electrochemical behaviour of both gases was first examined using cyclic voltammetry. The reaction mechanism appears to be the same on Pt SPEs as on Pt microelectrodes. Furthermore, the analytical utility was studied to understand the behaviour of these highly toxic gases at low concentrations on SPEs, with calibration graphs obtained from 10 to 80 ppm. Three different electrochemical techniques were employed: linear sweep voltammetry (LSV), differential pulse voltammetry (DPV) and square wave voltammetry (SWV), with no significant differences in the limits of detection (LODs) between the techniques (LODs were between 1.4 to 3.6 ppm for all three techniques for both gases). The LODs achieved on Pt SPEs were lower than the current Occupational Safety and Health Administration Permissible Exposure Limit (OSHA PEL) limits of the two gases (5 ppm for HCl and 10 ppm for MA), suggesting that Pt SPEs can successfully be combined with RTILs to be used as cheap alternatives for amperometric gas sensing in applications where these toxic gases may be released. View Full-Text
Keywords: room temperature ionic liquids; screen printed electrodes; cyclic voltammetry; differential pulse voltammetry; square wave voltammetry; detection limit; gas sensing room temperature ionic liquids; screen printed electrodes; cyclic voltammetry; differential pulse voltammetry; square wave voltammetry; detection limit; gas sensing
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Murugappan, K.; Silvester, D.S. Sensors for Highly Toxic Gases: Methylamine and Hydrogen Chloride Detection at Low Concentrations in an Ionic Liquid on Pt Screen Printed Electrodes. Sensors 2015, 15, 26866-26876.

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