Ionic Liquid-Based Optical and Electrochemical Carbon Dioxide Sensors

Abstract

Due to their unusual physicochemical properties (e.g., high thermal stability, low volatility, high intrinsic conductivity, wide electrochemical windows and good solvating ability), ionic liquids have shown immense application potential in many research areas. Applications of ionic liquid in developing various sensors, especially for the sensing of biomolecules, such as nucleic acids, proteins and enzymes, gas sensing and sensing of various important ions, among other chemosensing platforms, are currently being explored by researchers worldwide. The use of ionic liquids for the detection of carbon dioxide (CO2) gas is currently a major topic of research due to the associated importance of this gas with daily human life. This review focuses on the application of ionic liquids in optical and electrochemical CO2 sensors. The design, mechanism, sensitivity and detection limit of each type of sensor are highlighted in this review.

Drug induced micelle-to-vesicle transition in aqueous solutions of cationic surfactants

“…15 Ionic liquids (ILs) are composed only of ions and have, by operational denition, melting points < 100 C. Due to their structural versatility, they have found applications as solvents, catalysts and for capturing of-, and sensors for carbon dioxide. [16][17][18][19] IL-based surfactants (ILBSs) possess one or more hydrophobic tails, usually attached to a heterocyclic ring (e.g., imidazolium, pyridinium, piperidinium, pyrrolidinium) or amino acid cation (glycine, alanine, valine, proline and glutamic acid). Aggregation behavior of ILBSs that carry heterocyclic cations was investigated, and the micellar properties were compared with those of conventional surfactants.…”

The solubility of gases in ionic liquids

“…New materials are also being developed for gas sensors, supported IL membranes (SILMs) and poly(IL) membranes, carbon capture and chemical reaction using supported IL phases (SILPs), where the IL is confined on the surface or in the pores of the material . Professor Daniel Armstrong at the University of Texas in Arlington has developed a new class of capillary GC columns with stationary phases based on ILs.…”

The Use of Conductive Polymers Embedded Macro Porous Pei and Ionic Liquid Form of Pei Cryogels for Potential Conductometric Sensor Application to CO2

“…The use of PIL materials on CO 2 capture studies in the literature [25][26][27][28][29] urged us to study the change in the conductivity of conductive polymer containing IL PEI cryogels compounds after CO 2 gas exposure. Therefore, IL forms of the PEI cryogel were also treated with CO 2 for 30, 60, 120, and 240 min, and the change in their electrical properties was determined.…”