Preparation of Excitation-Independent Photoluminescent Graphene Quantum Dots with Visible-Light Excitation/Emission for Cell Imaging

被引：72

作者：

Chen, Shuai ^{[1
]}

Hai, Xin ^{[1
]}

Xia, Chang ^{[1
]}

Chen, Xu-Wei ^{[1
]}

Wang, Jian-Hua ^{[1
,2
]}

机构：

[1] Northeastern Univ, Res Ctr Analyt Sci, Shenyang 110819, Peoples R China

[2] Synerget Innovat Ctr Chem Sci & Engn, Tianjin 300071, Peoples R China

来源：

CHEMISTRY-A EUROPEAN JOURNAL | 2013年 / 19卷 / 47期

基金：

中国国家自然科学基金;

关键词：

cell imaging; graphene; pyrroles; quantum dots; UV; Vis spectroscopy; ONE-STEP; NITROGEN;

D O I：

10.1002/chem.201302207

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

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 (ex) 490nm (2.53eV) to emit excitation-independent photoluminescence at a maximum wavelength of (em) 550nm. This is thus far the longest emission wavelength reported for GQDs. Stable photoluminescence is achieved at pH4-10 with an ionic strength of 1.2molL(-1) KCl. These features make the p-GQDs excellent probes for bio-imaging and bio-labeling, which is demonstrated by imaging live HeLa cells.

引用

页码：15918 / 15923

页数：6

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