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

  • Carbon Letters
  • Abbr : Carbon Lett.
  • 2023, 33(6), pp.1561-1569
  • DOI : 10.1007/s42823-023-00521-3
  • Publisher : Korean Carbon Society
  • Research Area : Natural Science > Natural Science General > Other Natural Sciences General
  • Received : March 14, 2023
  • Accepted : April 24, 2023
  • Published : October 1, 2023

Yoon Eun Seop 1 Park Hong Jun 1 Yoon Jo Hee 1 Choi Bong Gill 1

1Department of Energy Resources and Chemical Engineering, Kangwon National University, Samcheok, 25913, Republic of Korea

Accredited

ABSTRACT

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.

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