Details

Autor(en) / Beteiligte

• Park, Hong Jun
• Jeong, Jae-Min
• Yoon, Jo Hee
• Son, Seon Gyu
• Kim, Yeong Kyun
• Kim, Do Hyun
• Lee, Kyoung G.
• Choi, Bong Gill

Titel

Preparation of ultrathin defect-free graphene sheets from graphite via fluidic delamination for solid-contact ion-to-electron transducers in potentiometric sensors

Ist Teil von

• Journal of colloid and interface science, 2020-02, Vol.560, p.817-824

Ort / Verlag

Elsevier Inc

Erscheinungsjahr

2020

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• Ultrathin and defect-free graphene sheets obtained by a fluid dynamics-induced exfoliation method show excellent performances of solid contact ion-to-electron transducer in potentiometric sensors with a Nernstian sensitivity, fast response time, potential stability, good repeatability, and excellent long-term stability. [Display omitted] In this study, ultrathin and defect-free graphene (Gr) sheets were prepared through a fluid dynamics–induced shear exfoliation method using graphite. The high hydrophobicity and surface area of Gr make it attractive as a solid-contact ion-to-electron transducer for potentiometric K+ sensors, in which the electrodes are fabricated through a screen-printing process. The electrochemical characterization demonstrates that Gr solid contact results in a high double-layer capacitance, potential stability, and strong resistance against water layer, gases, and light. The Gr-based K+ sensors showed a Nernstian slope of 53.53 mV/log[K+] within a linear concentration range of 10−1–10−4 M, a low detection limit of 10−4.28 M, a fast response time of ~8 s, good repeatability, and excellent long-term stability. Moreover, the Gr-based K+ sensors provided accurate ion concentrations in actual samples of human sweat and sports drinks.