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Quasi-Continuously Tuning the Size of Graphene Quantum Dots via an Edge-Etching Mechanism

Published online by Cambridge University Press:  17 March 2016

Shujun Wang ,
Ivan S. Cole ,
Dongyuan Zhao  and
Qin Li
Shujun Wang
Affiliation:
Queensland Miro- and Nanotechnology Centre, Griffith University, Nathan Campus, Brisbane, QLD 4111, Australia School of Engineering (Environmental), Griffith University, Nathan Campus, Brisbane, QLD 4111, Australia
Ivan S. Cole
Affiliation:
CSIRO Materials Science and Engineering, –Gate 5, Normanby Road, Clayton, VIC 3168, Australia
Dongyuan Zhao
Affiliation:
Department of Chemistry & Laboratory of Advanced Materials, Fudan University, Shanghai, 200433, P.R. China
Qin Li*
Affiliation:
Queensland Miro- and Nanotechnology Centre, Griffith University, Nathan Campus, Brisbane, QLD 4111, Australia School of Engineering (Environmental), Griffith University, Nathan Campus, Brisbane, QLD 4111, Australia
*
*Corresponding author at: Nathan campus Griffith University,170 Kessels Road, Nathan, QLD 4111, Au; E-mail address: qinli@griffith.edu.au; Tel.: (07) 373 57514

Abstract

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Graphene quantum dots (GQDs), a nano version of graphene whose interesting properties that distinguish them from bulk graphene, have recently received significant scientific attention. The quantum confinement effect referring to the size-dependence of physical and chemical properties opens great possibility in the practical applications of this material. However, tuning the size of graphene quantum dots is still difficult to achieve. Here, an edge-etching mechanism which is able to tune the size of GQDs in a quasi-continuous manner is discovered. Different from the ‘unzipping’ mechanism which has been adopted to cut bulk graphitic materials into small fragments and normally cut through the basal plane along the ‘zig-zag’ direction where epoxy groups reside, the mechanism discovered in this research could gradually remove the peripheral carbon atoms of nano-scaled graphene (i.e. GQDs) due to the higher chemical reactivity of the edge carbon atoms than that of inner carbon atoms thereby tuning the size of GQDs in a quasi-continuous fashion. It enables the facile manipulate of the size and properties of GQDs through controlling merely the reaction duration. It is also believed the as discovered mechanism could be generalized for synthesizing various sizes of GQDs from other graphitic precursors (e.g. carbon fibres, carbon nanotubes, etc).

Keywords

nanoscalenanostructureoptical properties
Type
Articles
Information
MRS Advances , Volume 1 , Issue 20: Nanomaterials and Synthesis , 2016 , pp. 1459 - 1467
Copyright
Copyright © Materials Research Society 2016 

References

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