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Issue 89, 2014
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A reformative oxidation strategy using high concentration nitric acid for enhancing the emission performance of graphene quantum dots

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Abstract

A high concentration nitric acid oxidation strategy has been presented for one-step fabrication of strongly red-emitting fluorescent graphene quantum dots (GQDs) using activated carbon as a carbon source. In optimal conditions, the emission quantum yield at 600 nm wavelength is as high as 18%. The concentration of the used nitric acid is critical to the optical properties of the GQDs: concentrated nitric acid (14.6 M) can more sufficiently oxidize GQDs' surface and more efficiently dope the N element, resulting in a longer emission band and higher emission efficiency. Preliminary cell image study indicates the obtained GQDs possess a high signal to background ratio, good stability and low cytotoxicity, which endow their promise as a new type of near-infrared fluorophores for biological applications.

Graphical abstract: A reformative oxidation strategy using high concentration nitric acid for enhancing the emission performance of graphene quantum dots

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Publication details

The article was received on 10 Jul 2014, accepted on 08 Sep 2014 and first published on 10 Sep 2014


Article type: Paper
DOI: 10.1039/C4RA06935H
Citation: RSC Adv., 2014,4, 47977-47981
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    A reformative oxidation strategy using high concentration nitric acid for enhancing the emission performance of graphene quantum dots

    T. Shao, G. Wang, X. An, S. Zhuo, Y. Xia and C. Zhu, RSC Adv., 2014, 4, 47977
    DOI: 10.1039/C4RA06935H

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