Enhancing the Fluorescence of Graphene Quantum Dots with a Oxidation Way

Ting Han; Xue Jiao Zhou; Xiao Chen Wu

doi:10.4028/www.scientific.net/AMR.887-888.156

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HomeAdvanced Materials ResearchAdvanced Materials Research Vols. 887-888Enhancing the Fluorescence of Graphene Quantum...

Enhancing the Fluorescence of Graphene Quantum Dots with a Oxidation Way

Abstract:

It is a facile and efficient way to produce grapheme quantum dots (GQDs) through photo-Fenton reaction. However, the fluorescence of the as-generated GQDs is weak. Here, bright yellow-green fluorescent graphene quantum dots (GQDs) were prepared by post-oxidation of the GQDs with H₂O₂. The fluorescence quantum yields of the post-oxidized GQDs (O-GQDs) increased from 0.08% to 3.3% and the maximum emission wavelength shifted from 450 to 510 nm. The O-GQDs exhibit excitation-independent and pH-dependent photoluminescence behaviors. The increase of the photoluminescence intensity is attributed to the more carbonyl and carboxyl groups after the post-oxidation. The post-oxidation treatment offers a simple pathway to enhance the fluorescence of GQDs.

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Periodical:

Advanced Materials Research (Volumes 887-888)

Pages:

156-160

DOI:

https://doi.org/10.4028/www.scientific.net/AMR.887-888.156

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Online since:

February 2014

Authors:

Ting Han, Xue Jiao Zhou, Xiao Chen Wu

Keywords:

Fluorescence, Graphene Quantum Dots, Photo-Fenton Reaction, Post-Oxidation

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