Journal
NANO LETTERS
Volume 9, Issue 9, Pages 3318-3322Publisher
AMER CHEMICAL SOC
DOI: 10.1021/nl901596m
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Funding
- Core Research for Evolutional Science and Technology (CREST)
- Japan Science and Technology Corporation (JST)
- Japan Society for the Promotion of Science [19054011]
- Japan Society for the Promotion of Science
- Nippon Graphite Industries Ltd
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We Investigated electrolyte-gated graphene field-effect transistors (GFETs) for electrical detecting pH and protein adsorptions, Nonfunctionalized single-layer graphene was used as a channel. GFETs immersed in an electrolyte showed transconductances 30 times higher than those in a vacuum and their conductances exhibited a direct linear increase with electrolyte pH, indicating their potential for use in pH sensor applications. We also attempted to direct surface-protein adsorption and showed that the conductance of GFETs increased with exposure to a protein at several hundred picomolar. The GFETs thus acted as highly sensitive electrical sensors for detecting pH and biomolecule concentrations.
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