量子点
材料科学
荧光
石墨烯
纳米技术
光电子学
物理
光学
作者
Bedanga Sapkota,Abdelkrim Benabbas,Hao‐Yu Greg Lin,Wentao Liang,P. M. Champion,Meni Wanunu
标识
DOI:10.1021/acsami.6b16364
摘要
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.
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