Simultaneous Detection of Mixed-Gas Components by Ionic-Gel Sensors with Multiple Electrodes

Abstract

The sensing of gas components in a mixed gas is required for breath-based health monitoring and diagnosis. In this work, we report the simultaneous detection of mixed-gas components using a sensor consisting of [EMIM][BF 4 ]-based ionic gel with four electrodes made of Au, Pt, Rh, and Cr. The voltage between any given pair of electrodes depends on the gas molecules absorbed in the ionic gel and the elements the electrodes are made of. When the voltage signals between all pairs of electrodes were used, H 2 , NH 3 , and C 2 H 5 OH concentrations were simultaneously estimated by a neural-network-based inference. From molecular dynamics simulations, the origin of the voltage signal was attributed to the catalytically generated adsorbates on the electrodes.

Intelligent ion gels: Design, performance, and applications

“…For example, Wöllenstein and colleagues 76 prepared carbon dioxide-responsive ion gels using metal oxides, polymers, ILs, and so on. Tanaka et al 77 determined the effect of hydrogen, ammonia, and ethanol on the bilayer at the ion gel/metal electrode interface and identified and screened the gas mixture on the basis of F I G U R E 6 (A) Polymer skeleton modified with light-emitting groups. (B) Modulation of the luminescence spectrum by the mixing ratio of luminescent groups.…”

“…For example, Wöllenstein and colleagues 76 prepared carbon dioxide‐responsive ion gels using metal oxides, polymers, ILs, and so on. Tanaka et al 77 determined the effect of hydrogen, ammonia, and ethanol on the bilayer at the ion gel/metal electrode interface and identified and screened the gas mixture on the basis of changes in the signal of the interfacial bilayer. When the interface responds to the gas, the interfacial bilayer is altered so that a weak voltage signal is output.…”

Green, pH-Sensitive, Highly Stretchable, and Hydrogen Bond-Dominated Ionogel for Wound Healing Activity

“…For infected wounds or chronic wounds with special conditions like diabetic feet, decubitus, and pressure sores, conventional hydrogel dressings are usually ineffective due to a lack of properties such as antimicrobial and detection capabilities . Therefore, various novel wound dressings are currently being developed. − Multifunctional wound dressings containing bioactive agents, conductive polymers, antibiotics, and cytokines improve the healing and posthealing effect of patients. − Among these new wound dressings, ionogel dressings are promising materials due to their excellent performance. − In addition to having hydrogel-like properties, the ionic liquid in the ionogels has a low vapor pressure, which can effectively prevent the volatilization of water. This effectively solves the problem of severe water loss in hydrogel wound dressings exposed to the air.…”

Ultra‐Fast Portable and Wearable Sensing Design for Continuous and Wide‐Spectrum Molecular Analysis and Diagnostics

“…[ 10 ] Nevertheless, this approach provides a superimposed signal(s), that is, a weighted sum of the responses of the individual components or the overall collective fingerprint of the sample, from all compounds in the sample. [ 11 ] Additionally, the countless possible combinations of components in a mixture, which need to be tested and trained for a reliable prediction in real sample analysis, complicates the prediction of each individual compound in real sample analysis and decreases its reliability.…”