Hydrophobic ionic liquid-modified graphene via fluid-dynamic process for ion-to-electron transducers for all-solid-state potentiometric sensors

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-selectiv...

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Bibliographic Details
Published in:Carbon Letters 2023, 33(6), , pp.1561-1569
Main Authors: Yoon, Eun Seop, Park, Hong Jun, Yoon, Jo Hee, Choi, Bong Gill
Format: Article
Language:English
Subjects:
Capacitance
Carbon
Chemical sensors
Collectors
Electric currents
Electric potential
Electrodes
Fluid dynamics
Fourier transforms
Graphene
Graphite
Hydrodynamics
Hydrophobicity
Ionic liquids
Polymers
Polyvinyl chloride
Sensors
Sodium
Solid state
Transducers
자연과학일반
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Summary: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 
ISSN:1976-4251
2233-4998
DOI:10.1007/s42823-023-00521-3