Ionic liquids as green solvents and electrolytes for robust chemical sensor development

Area of Science:

• Materials Science
• Analytical Chemistry
• Electrochemistry

Background:

• Ionic liquids (ILs) possess unique dual properties as solvents and electrolytes.
• Structurally tunable cations and anions in ILs enable novel sensing technologies.
• Understanding IL physiochemical properties is crucial for analyte interaction and redox mechanisms.

Purpose of the Study:

• To summarize recent developments and applications of task-specific ILs in sensing platforms.
• To highlight the rational design and selection of ILs and their composites for sensing.
• To showcase contributions to piezoelectric and electrochemical sensing using ILs.

Main Methods:

• Spectroscopic investigations
• Thermodynamic and solvation models
• Molecular simulations
• Design of functionalized ionics
• Surface immobilization of ILs on solid supports
• Development of IL/conducting polymer host systems
• Fabrication of a two-dimensional electrode chip for simultaneous signal monitoring

Main Results:

• ILs demonstrate utility in both piezoelectric and electrochemical sensing formats.
• Task-specific ILs and their surface immobilization serve as effective recognition elements.
• IL-based sensors show potential for high-temperature applications and detection of various analytes.
• IL/conducting polymer systems enhance sensitivity and reproducibility of piezoelectric sensors.
• Integrated piezoelectric and electrochemical sensing provides enhanced selectivity and quantification.

Conclusions:

• Self-organized phases of ILs are valuable sensing materials for electrochemical and quartz crystal microbalance transducers.
• ILs offer a tunable and non-volatile alternative to conventional sensing materials and electrolytes.
• Further systematic and mechanistic studies of ILs are needed to fully exploit their sensing potential.