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Issue 20, 2014
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Edge-enriched graphene quantum dots for enhanced photo-luminescence and supercapacitance

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Abstract

Graphene quantum dots (GQDs) with their edge-bound nanometer-size present distinctive properties owing to quantum confinement and edge effects. We report a facile ultrasonic approach with chemical activation using KOH to prepare activated GQDs or aGQDs enriched with both free and bound edges. Compared to GQDs, the aGQDs we synthesized had enhanced BET surface area by a factor of about six, the photoluminescence intensity by about four and half times and electro-capacitance by a factor of about two. Unlike their non-activated counterparts, the aGQDs having enhanced edge states emit enhanced intense blue luminescence and exhibit electrochemical double layer capacitance greater than that of graphene, activated or not. Apart from their use as part of electrodes in a supercapacitor, the superior luminescence of aGQDs holds potential for use in biomedical imaging and related optoelectronic applications.

Graphical abstract: Edge-enriched graphene quantum dots for enhanced photo-luminescence and supercapacitance

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Supplementary files

Article information


Submitted
02 May 2014
Accepted
03 Aug 2014
First published
01 Sep 2014

Nanoscale, 2014,6, 11988-11994
Article type
Paper

Edge-enriched graphene quantum dots for enhanced photo-luminescence and supercapacitance

M. Hassan, E. Haque, K. R. Reddy, A. I. Minett, J. Chen and V. G. Gomes, Nanoscale, 2014, 6, 11988
DOI: 10.1039/C4NR02365J

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