Modified Screen Printed Electrode Suitable for Electrochemical Measurements in Gas Phase

Area of Science:

• Electrochemistry
• Analytical Chemistry
• Sensor Technology

Background:

• Traditional electrochemical analyses often require supporting electrolytes, posing challenges for gaseous sample analysis.
• Existing gas sensors may lack sensitivity, speed, or require complex membrane structures.

Purpose of the Study:

• To develop a convenient, portable, and disposable electrochemical assembly for analyzing gaseous samples.
• To create a membrane-free gas sensor utilizing screen-printed carbon electrodes (SPCE) and novel electrolytes.

Main Methods:

• Assembly of SPCE with a filter paper crown soaked in room-temperature ionic liquids (RTILs) or deep eutectic solvents (DES).
• Utilized a gasket for electrical contact and a polylactic acid holder for component integration.
• Evaluated performance using voltammetric and flow injection analyses (FIA) with oxygen as the target analyte.

Main Results:

• Achieved a sensitive, fast-responding, membrane-free gas sensor.
• The effective working electrode surface is the interface between the carbon disk and the electrolyte-soaked paper crown.
• Demonstrated the assembly's profitability for gaseous atmosphere analysis, particularly as an FIA detector.

Conclusions:

• The developed assembly provides a versatile and cost-effective electrochemical platform for gas sensing.
• Immobilization of RTILs or DESs on paper offers a practical approach for creating disposable gas sensors.
• This technology is highly suitable for detecting electroactive gaseous analytes in various applications.