Abstract
We demonstrated one-step method to fabricate two different sizes of graphene quantum dots (GQDs) through chemical cutting from graphene oxide (GO), which had many advantages in terms of simple process, low cost, and large scale in manufacturing with higher production yield comparing to the reported methods. Several analytical methods were employed to characterize the composition and morphology of the resultants. Bright blue luminescent GQDs were obtained with a produced yield as high as 34.8%. Moreover, how the different sizes affect fluorescence wavelength mechanism was investigated in details.
Highlights
The unique structure of monolayered graphene was composed of a one-atom-thick two-dimensional crystal of sp2 carbon atoms arranged in a honeycomb lattice, which had been attributed to its extraordinary electronic properties such as high intrinsic mobility and excellent thermal and electrical conductivities
The produced graphene oxide (GO), which ranged from a few tens of nanometers to several tens of micrometers in the lateral dimension, contained various shapes and nanosized sp2 carbon domains localized by the sp3 carbon structures, resulting in semiconductive and PL properties [11]
We demonstrated a one-step method to fabricate two different sizes of graphene quantum dots (GQDs)-1 and GQDs-2 from GO, which was presented to tune the different sizes of graphene oxide quantum dots at ranges 2 to 4 and 3 to 5 nm and simultaneously tailor its edge structure by oxidation cutting
Summary
The unique structure of monolayered graphene was composed of a one-atom-thick two-dimensional crystal of sp carbon atoms arranged in a honeycomb lattice, which had been attributed to its extraordinary electronic properties such as high intrinsic mobility and excellent thermal and electrical conductivities Those characteristics of graphene had led to extensive applications in the fields of electronic devices, including photovoltaic cells, supercapacitors, and flexible touch screens [1,2,3]. In addition to the control of sp carbon domain by reduction process, several reports have focused on modulating the size of graphene itself to less than 100 nm, graphene quantum dots (GQDs), to endow quantum confinement effect that was a contributing factor for PL emission [3] Such GQDs display moderate PL signal, non-toxicity, and cell permeability, so their biological applications on cellular imaging, biosensors, and drug delivery were very promising [12].
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