1 research outputs found
Peptide-Decorated Tunable-Fluorescence Graphene Quantum Dots
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 Göppert–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