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

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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.
Publisher
ACADEMIC PRESS INC ELSEVIER SCIENCE
Issue Date
2020-02
Language
English
Article Type
Article
Citation

JOURNAL OF COLLOID AND INTERFACE SCIENCE, v.560, pp.817 - 824

ISSN
0021-9797
DOI
10.1016/j.jcis.2019.11.001
URI
http://hdl.handle.net/10203/270314
Appears in Collection
CBE-Journal Papers(저널논문)
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