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Preparation of ultrathin defect-free graphene sheets from graphite via fluidic delamination for solid-contact ion-to-electron transducers in potentiometric sensors
- Source :
- Journal of Colloid and Interface Science. 560:817-824
- Publication Year :
- 2020
- Publisher :
- Elsevier BV, 2020.
-
Abstract
- 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.
- Subjects :
- Materials science
Transducers
Potentiometric titration
Analytical chemistry
Biosensing Techniques
02 engineering and technology
Electric Capacitance
010402 general chemistry
Electrochemistry
01 natural sciences
Capacitance
law.invention
Ion
Biomaterials
Colloid and Surface Chemistry
law
Energy Drinks
Humans
Graphite
Sweat
Electrodes
Graphene
021001 nanoscience & nanotechnology
Exfoliation joint
0104 chemical sciences
Surfaces, Coatings and Films
Electronic, Optical and Magnetic Materials
Electrode
Potassium
Potentiometry
0210 nano-technology
Hydrophobic and Hydrophilic Interactions
Subjects
Details
- ISSN :
- 00219797
- Volume :
- 560
- Database :
- OpenAIRE
- Journal :
- Journal of Colloid and Interface Science
- Accession number :
- edsair.doi.dedup.....11056eeb82a82bb2cd4dffd1a86395cf