Abstract
Graphene oxide (GO), which is an oxidized form of graphene, has a mixed structure consisting of graphitic crystallites of sp2 hybridized carbon and amorphous regions. In this work, we present a straightforward route for preparing graphene-based quantum dots (GQDs) by extraction of the crystallites from the amorphous matrix of the GO sheets. GQDs with controlled functionality are readily prepared by varying the reaction temperature, which results in precise tunability of their optical properties. Here, it was concluded that the tunable optical properties of GQDs are a result of the different fraction of chemical functionalities present. The synthesis approach presented in this paper provides an efficient strategy for achieving large-scale production and long-time optical stability of the GQDs, and the hybrid assembly of GQD and polymer has potential applications as photoluminescent fibers or films.
Highlights
Graphene oxide (GO) is separated from the bulk graphite powders via a chemical oxidation process[1,2], and is decorated with a variety of oxygen-containing functional groups such as hydroxyl, epoxide, and carboxylic groups[3]
The vigorous reaction rate of H2O2 can be retarded by addition of a small amount of NH3, since NH3 provides a basic pH condition that induces the chemical decomposition of H2O2 into H2O and O233,34
We have showed that GO is a promising platform for the preparation of graphene-based quantum dots (GQDs)
Summary
Graphene oxide (GO) is separated from the bulk graphite powders via a chemical oxidation process[1,2], and is decorated with a variety of oxygen-containing functional groups such as hydroxyl, epoxide, and carboxylic groups[3]. Different from the conventional defect restoration approaches[12,13,14,15], our steam activation method has been appreciated for its selective decomposition of the defective areas with less energy, leading to nanoporous GO6 In this strategy, controlling the defects in GO provides a useful tool for controlling its morphology, thereby offering an efficient route for the preparation of functional carbon nanomaterials. Namely the selective elimination of defects in GO sheets, offers a novel pathway to produce GQDs from the bulk graphite powders in large quantities with high QY and enables the production of novel GQDs-based polymeric composites, such as photoluminescent fibers and films
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