An electrochemical gas sensor based on paper supported room temperature ionic liquids
Nicolò Dossi1, Rosanna Toniolo, Andrea Pizzariello
1Department of Food Science, University of Udine, via Cotonificio 108, I-33100 Udine, Italy.
Lab on a Chip
|November 15, 2011
Summary
A novel membrane-free amperometric gas sensor utilizes room temperature ionic liquid (RTIL) soaked paper for sensitive and rapid detection of gaseous analytes. This innovative sensor demonstrates excellent performance for 1-butanethiol detection, paving the way for diverse applications.
Area of Science:
- Electrochemistry
- Chemical Sensors
- Materials Science
Background:
- Traditional gas sensors often face limitations such as slow response times and the need for complex membrane structures.
- Room temperature ionic liquids (RTILs) offer unique properties like high conductivity and negligible vapor pressure, making them suitable for sensor development.
- Immobilizing RTILs onto porous, inexpensive materials like paper can lead to simplified and cost-effective sensor designs.
Purpose of the Study:
- To develop a sensitive and fast-responding membrane-free amperometric gas sensor.
- To investigate the use of RTIL-soaked paper as a supporting material for electrochemical detection.
- To evaluate the sensor's performance for detecting volatile organic compounds, specifically 1-butanethiol.
Main Methods:
- Screen printing of three electrodes onto filter paper soaked with a room temperature ionic liquid (RTIL).
- Utilizing the high conductivity and low vapor pressure of RTILs for efficient charge transfer at the three-phase interface.
- Employing a wall-jet amperometric detector setup for flow injection analysis of 1-butanethiol in headspace samples.
- Doping the working electrode with cobalt(II) phthalocyanine to electrocatalyze thiol oxidation.
Main Results:
- The developed RTIL-soaked paper electrochemical detector (RTIL-PED) achieved a detection limit of 0.5 μM and a dynamic range of 2-200 μM for 1-butanethiol.
- High correlation coefficient (0.998) and good repeatability (±7% RSD) were observed.
- The sensor exhibited satisfactory long-term stability (9%), indicating its robustness.
Conclusions:
- The membrane-free amperometric gas sensor based on RTIL-soaked paper is a promising technology for sensitive and rapid gas detection.
- The sensor design effectively overcomes limitations associated with analyte diffusion and dissolution.
- This approach offers a cost-effective and versatile platform for various gas sensing applications.
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