An electrochemical gas sensor based on paper supported room temperature ionic liquids
| Autor: | S. Battiston, Gino Bontempelli, Andrea Pizzariello, Nicolò Dossi, Emanuel Carrilho, Rosanna Toniolo, Evandro Piccin |
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| Rok vydání: | 2012 |
| Předmět: |
Paper
Working electrode EXCHANGE MEMBRANES Biomedical Engineering Analytical chemistry Ionic Liquids Bioengineering Biochemistry QUÍMICA ANALÍTICA chemistry.chemical_compound Limit of Detection Pressure Sulfhydryl Compounds Electrodes Dissolution CARBON-PASTE ELECTRODES COBALT PHTHALOCYANINE Aqueous solution Filter paper Electric Conductivity Imidazoles Temperature Reproducibility of Results Electrochemical Techniques General Chemistry Amperometry Electrochemical gas sensor Models Chemical chemistry LOW-CONDUCTIVITY Flow Injection Analysis Electrode Ionic liquid Gases Capillary Action |
| Zdroj: | Repositório Institucional da USP (Biblioteca Digital da Produção Intelectual) Universidade de São Paulo (USP) instacron:USP Lab on a chip 12 (2012): 153–158. doi:10.1039/c1lc20663j info:cnr-pdr/source/autori:Dossi N.; Toniolo R.; Pizzariello A.; Carrilho E.; Piccin E.; Battiston S.; Bontempelli G./titolo:An electrochemical gas sensor based on paper supported room temperature ionic liquids/doi:10.1039%2Fc1lc20663j/rivista:Lab on a chip (Print)/anno:2012/pagina_da:153/pagina_a:158/intervallo_pagine:153–158/volume:12 |
| ISSN: | 1473-0189 1473-0197 |
| Popis: | A sensitive and fast-responding membrane-free amperometric gas sensor is described, consisting of a small filter paper foil soaked with a room temperature ionic liquid (RTIL), upon which three electrodes are screen printed with carbon ink, using a suitable mask. It takes advantage of the high electrical conductivity and negligible vapour pressure of RTILs as well as their easy immobilization into a porous and inexpensive supporting material such as paper. Moreover, thanks to a careful control of the preparation procedure, a very close contact between the RTIL and electrode material can be achieved so as to allow gaseous analytes to undergo charge transfer just as soon as they reach the three-phase sites where the electrode material, paper supported RTIL and gas phase meet. Thus, the adverse effect on recorded currents of slow steps such as analyte diffusion and dissolution in a solvent is avoided. To evaluate the performance of this device, it was used as a wall-jet amperometric detector for flow injection analysis of 1-butanethiol vapours, adopted as the model gaseous analyte, present in headspace samples in equilibrium with aqueous solutions at controlled concentrations. With this purpose, the RTIL soaked paper electrochemical detector (RTIL-PED) was assembled by using 1-butyl-3- methylimidazolium bis(trifluoromethanesulfonyl)imide as the wicking RTIL and printing the working electrode with carbon ink doped with cobalt(ii) phthalocyanine, to profit from its ability to electrocatalyze thiol oxidation. The results obtained were quite satisfactory (detection limit: 0.5 ?M; dynamic range: 2-200 ?M, both referring to solution concentrations; correlation coefficient: 0.998; repeatability: ±7% RSD; long-term stability: 9%), thus suggesting the possible use of this device for manifold applications. © 2012 The Royal Society of Chemistry. |
| Databáze: | OpenAIRE |
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