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Hydrophobic ionic liquid‑modified graphene via fluid‑dynamic process for ion‑to‑electron transducers for all‑solid‑state potentiometric sensors KCI 등재
- 언어ENG
- URLhttps://db.koreascholar.com/Article/Detail/428166
Owing to the great demand for portable and wearable chemical sensors, the development of all-solid-state potentiometric ion sensors is highly desirable considering their simplicity and stability. However, most ion sensors are challenged by the penetration of water and gas molecules into ion-selective membranes, causing unstable and undesirable sensing performances. In this study, a hydrophobic ionic liquid-modified graphene (Gr) sheet was prepared using a fluid dynamics-induced exfoliation and functionalization process. The high hydrophobicity and electrical double-layer capacitance of Gr make it a potential solid-state ion-to-electron transducer for the development of potentiometric sodium-ion ( Na+) sensors. The as-prepared Na+ sensors effectively prevented the formation of the water layer and penetration of gas species, resulting in stable and high sensing performances. The Na+ sensors showed a Nernstian sensitivity of 58.11 mV/[Na+] with a low relative standard deviation (0.46), fast response time (5.1 s), good selectivity (K < 10− 4), and good durability. Furthermore, the Na+ sensor demonstrated its feasibility in practical applications by measuring accurate and reliable ion concentrations of artificial human sweat and tear samples, comparable to a commercial ion meter.
Abstract
1 Introduction
2 Experimental materials and methods
2.1 Materials
2.2 Preparation and characterization of IL-Gr sheets
2.3 Fabrication and characterization of Na+ sensor
3 Results and discussions
4 Conclusion
Acknowledgements
References
