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- Title
Preparation of Excitation-Independent Photoluminescent Graphene Quantum Dots with Visible-Light Excitation/Emission for Cell Imaging.
- Authors
Chen, Shuai; Hai, Xin; Xia, Chang; Chen, Xu‐Wei; Wang, Jian‐Hua
- Abstract
We report the first pyrrole-ring surface-functionalized graphene quantum dots (p-GQDs) prepared by a two-step hydrothermal approach under microwave irradiation in an ammonia medium. The most distinct feature of the functionalized GQDs is that both the excitation and emission wavelengths fall into the visible-light region. The p-GQDs are excited by visible light at λex 490 nm (2.53 eV) to emit excitation-independent photoluminescence at a maximum wavelength of λem 550 nm. This is thus far the longest emission wavelength reported for GQDs. Stable photoluminescence is achieved at pH 4-10 with an ionic strength of 1.2 mol L−1 KCl. These features make the p-GQDs excellent probes for bio-imaging and bio-labeling, which is demonstrated by imaging live HeLa cells.
- Subjects
QUANTUM dots; PHOTOLUMINESCENCE; CLONE cells; ORGANONITROGEN compounds; HELA cells
- Publication
Chemistry - A European Journal, 2013, Vol 19, Issue 47, p15918
- ISSN
0947-6539
- Publication type
Article
- DOI
10.1002/chem.201302207