Journal
ACS SENSORS
Volume 3, Issue 11, Pages 2408-2414Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acssensors.8b00918
Keywords
graphene quantum dots; nanosensors; ion-selective; sodium; potassium
Funding
- National Natural Science Foundation of China
- Thousand Talents Program of China
- Shenzhen Municipal Science and Technology Innovation Council
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To enrich the recipes of ion-selective nanosensors, graphene quantum dots (GQDs) were integrated into ionophore-based fluorescent nanosensors with exquisite selectivity and high sensitivity for Na+ and K+. The unique property of GQDs gave the nanosensors ultrasmall size (ca. 10 nm), high brightness, good biocompatibility, and potential pH sensing possibility. At pH 7.4, the sensors exhibited a detection range from 0.1 mM to 1 M for Na+ and from 3 mu M to 1 mM for K+.The nanosensors were successfully applied to blood serum and urine samples. Chemically induced intracellular sodium concentration change in HeLa cells was also qualitatively monitored.
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