Tailoring color emissions from N-doped graphene quantum dots for bioimaging applications

Dan Qu; Min Zheng; Jing Li; Zhigang Xie; Zaicheng Sun

doi:10.1038/lsa.2015.137

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Tailoring color emissions from N-doped graphene quantum dots for bioimaging applications

Original Articles

- Tailoring color emissions from N-doped graphene quantum dots for bioimaging applications
- Light: Science & Applications Vol. 4, Issue 4, (2015)
- Affiliations：
  
  1.State Key Laboratory of Luminescence and Applications, Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences, No. 3888 Dong Nanhu Road, Changchun 130033, China
  2.University of Chinese Academy of Sciences, No.19A, Yuquan Road, Beijing 100049, China
  3.State Key Laboratory of Polymer Physics and Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, No. 5625, Renmin Street, Changchun 130022, China
  4.Beijing Key Laboratory for Green Catalysis and Separation, Department of Chemistry and Chemical Engineering, Beijing University of Technology, 100 Pingleyuan, Chaoyang District, Beijing 100124, China
- Author bio：
  
  ZC Sun, Email: sunzc@ciomp.ac.cn
- Funds：
- DOI：10.1038/lsa.2015.137
  CLC：
- Published：2015-12，
  
  Published Online：24 August 2015，
  
  Received：24 December 2014，
  
  Revised：20 August 2015，
  
  Accepted：20 August 2015
- Accepted：
Scan QR Code
Qu, D. et al. Tailoring color emissions from N-doped graphene quantum dots for bioimaging applications. Light: Science & Applications, 4, e364 (2015).
DOI：

Qu, D. et al. Tailoring color emissions from N-doped graphene quantum dots for bioimaging applications. Light: Science & Applications, 4, e364 (2015). DOI： 10.1038/lsa.2015.137.

摘要

Abstract

Unlike inorganic quantum dots

fluorescent graphene quantum dots (GQDs) display excitation-dependent multiple color emission. In this study

we report N-doped GQDs (N-GQDs) with tailored single color emission by tuning

-conjugation degree

which is comparable to the inorganic quantum dot. Starting from citric acid and diethylenetriamine

as prepared N-GQDs display blue

green

and yellow light emission by changing the reaction solvent from water

dimethylformamide (DMF)

and solvent free. The X-ray photoelectron spectroscopy

ultraviolet-visible spectra results clearly show the N-GQDs with blue emission (N-GQDs-B) have relatively short effective conjugation length and more carboxyl group because H

O is a polar protic solvent

which tends to donate proton to the reagent to depress the H

O elimination reaction. On the other hand

the polar aprotic solvent (DMF) cannot donate hydrogen

the elimination of H

O is promoted and more nitrogen units enter GQD framework. With the increase of effective

-conjugation length and N content

the emission band of N-GQDS red-shifts to green and yellow. We also demonstrate that N-GQDs could be a potential great biomarker for fluorescent bioimaging.

关键词

Keywords

excitation wavelength independentgraphene quantum dotsnitrogen dopedpure color emission

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