Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 9, Issue 11, Pages 9378-9387Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.6b16364
Keywords
graphene quantum dots; tunable fluorescence; peptides; DNA binding; biological imaging; two-photon fluorescence
Funding
- National Science Foundation (NSF) [EFMA-1542707, CHE-1243948]
- Division Of Chemistry
- Direct For Mathematical & Physical Scien [1243948] Funding Source: National Science Foundation
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We report here the synthesis of graphene quantum dots with tunable size, surface chemistry, and fluorescence properties. In the size regime 15-35 nm, these quantum dots maintain strong visible light fluorescence (mean quantum yield of 0.64) and a high two-photon absorption (TPA) cross section (6500 Goppert-Mayer units). Furthermore, through noncovalent tailoring of the chemistry of these quantum dots, we obtain water-stable quantum dots. For example, quantum dots with lysine groups bind strongly to DNA in solution and inhibit polymerase-based DNA strand synthesis. Finally, by virtue of their mesoscopic size, the quantum dots exhibit good cell permeability into living epithelial cells, but they do not enter the cell nucleus.
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