Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/32222
Title: Size-dependent structural and optical characteristics of glucose-derived graphene quantum dots
Authors: Tang, L
Ji, R
Li, X
Teng, KS
Lau, SP 
Keywords: Electron energy loss spectroscopy
Graphene
Quantum dots
Soft templates
Time-resolved photoluminescence
Issue Date: 2013
Publisher: Wiley-V C H Verlag Gmbh
Source: Particle and particle systems characterization, 2013, v. 30, no. 6, p. 523-531 How to cite?
Journal: Particle and Particle Systems Characterization 
Abstract: It is of scientific importance to obtain graphene quantum dots (GQDs) with narrow-size distribution in order to unveil their size-dependent structural and optical properties, thereby further to explore the energy band diagram of GQDs. Here, a soft-template microwave-assisted hydrothermal method to prepare GQDs with diameters less than 5 nm ± 0.55 nm is reported. The size-dependent photoluminescence (PL) quantum yield (QY) decay lifetime and electron energy loss spectroscopy (EELS) of the GQDs are studied systematically. The QY of the GQDs with an average diameter of 2 nm is the highest (15%) among all the samples investigated and the QY decreases with increasing diameter of the GQDs. The size-dependence of the PL decay lifetime is also observed. The result suggests that spatial confinement effects related to radiative relaxation play an important role in the size-dependent decay lifetime. A realistic energy band diagram of the GQDs is deduced from the experimental results.
URI: http://hdl.handle.net/10397/32222
ISSN: 0934-0866
DOI: 10.1002/ppsc.201200131
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