Abstract
An ionic liquid–polymer gel was found to improve the robustness of an integrated planar electrode system for portable oxygen gas-sensing applications.
Highlights
Amperometric gas sensors have been extensively used over the past several decades for measuring target gases including oxygen, carbon dioxide and hydrogen sulphide.[1]
E-mail: d.silvester-dean@ curtin.edu.au; Fax: +61 892662300; Tel: +61 892667148 † Electronic supplementary information (ESI) available: Figure of the gas mixing system with thin-film electrodes (TFEs), table of the calculated masses and actual masses used for the preparation of the different poly(methyl methacrylate) (PMMA)–room temperature ionic liquid (RTIL) mixtures, table of the contact angles, cyclic voltammetry at different scan rates, plots of peak current vs. square root scan rate for each PMMA–RTIL mixture, and overlaid cyclic voltammograms for the orientation experiments shown in Fig. S7 and S8, and photo of TFE a er experiments where the electrodes show visible fouling
The thin- lm electrode used in this work was chosen due to its relatively low cost and the fact that it is entirely metal-based, in contrast to screen-printed electrodes (SPEs), where unusual follow-up chemistry was observed for O2 reduction in imidazolium-based RTILs.[14]
Summary
Amperometric gas sensors have been extensively used over the past several decades for measuring target gases including oxygen, carbon dioxide and hydrogen sulphide.[1]. Room temperature ionic liquids (RTILs) have been investigated as a replacement for traditional electrolytes in sensors due to their many favourable properties including wide electrochemical windows, intrinsic conductivity, high chemical and physical stability and the ability to dissolve a wide range of analyte.
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