Deep ultraviolet photoluminescence of water-soluble self-passivated graphene quantum dots.

@article{Tang2012DeepUP,
  title={Deep ultraviolet photoluminescence of water-soluble self-passivated graphene quantum dots.},
  author={Libin Tang and Rong-bin Ji and Xiangke Cao and Jingyu Lin and Hongxing Jiang and Xueming Li and Kar Seng Teng and Chi Man Luk and Songjun Zeng and Jianhua Hao and Shu Ping Lau},
  journal={ACS nano},
  year={2012},
  volume={6 6},
  pages={
          5102-10
        }
}
Glucose-derived water-soluble crystalline graphene quantum dots (GQDs) with an average diameter as small as 1.65 nm (∼5 layers) were prepared by a facile microwave-assisted hydrothermal method. The GQDs exhibits deep ultraviolet (DUV) emission of 4.1 eV, which is the shortest emission wavelength among all the solution-based QDs. The GQDs exhibit typical excitation wavelength-dependent properties as expected in carbon-based quantum dots. However, the emission wavelength is independent of the… Expand
Preparation of excitation-independent photoluminescent graphene quantum dots with visible-light excitation/emission for cell imaging.
TLDR
This report reports the first pyrrole-ring surface-functionalized graphene quantum dots prepared by a two-step hydrothermal approach under microwave irradiation in an ammonia medium, which is thus far the longest emission wavelength reported for GQDs. Expand
Facile synthesis and photoluminescence characteristics of blue-emitting nitrogen-doped graphene quantum dots.
TLDR
It is initially believed that synthesis parameters, hydrothermal process and nitrogen doping may greatly influence the surface state and bandgap of the GQDs, which are important in determining the PL characteristics of the N-GQDs. Expand
Deep ultraviolet emission photoluminescence and high luminescece efficiency of ferric passivated graphene quantum dots: Strong negative inductive effect of Fe
Abstract It is necessary to broaden the finite band gap of the graphene quantum dots (GQDs) and prepare deep ultraviolet emission GQDs with high luminescence efficiency. In this study, the deepExpand
Easy extraction of water-soluble graphene quantum dots for light emitting diodes
Graphene quantum dots (GQDs) have attracted a large amount of attention due to their unique optoelectronic properties, which arise from the quantum confinement effect or edge effect or surfaceExpand
Facile synthesis and photoluminescence mechanism of graphene quantum dots
We report a facile hydrothermal synthesis of intrinsic fluorescent graphene quantum dots (GQDs) with two-dimensional morphology. This synthesis uses glucose, concentrate sulfuric acid, and deionizedExpand
Size and pH dependent photoluminescence of graphene quantum dots with low oxygen content
The photoluminescence of graphene quantum dots (GQDs) is rigorously investigated due to their potential applications. However, GQDs from graphene oxide are inherently embedded with non-negligibleExpand
Drastic Change in Photoluminescence Properties of Graphene Quantum Dots by Chromatographic Separation
Graphene quantum dots (GQDs) have attracted a great deal of interest from the viewpoints of both fundamental studies and applications. Photoluminescence (PL) is one of the intriguing properties ofExpand
Synthesis of short-chain passivated carbon quantum dots as the light emitting layer towards electroluminescence
Short-chain passivated fluorescent carbon quantum dots (S-CQDs) with graphitic structure were synthesized via a one-step hydrothermal approach using phthalic acid with a benzene ring conjugatedExpand
Electroluminescence from graphene quantum dots prepared by amidative cutting of tattered graphite.
TLDR
This is to the best knowledge the first meaningful report on the electroluminescence of GQDs, successfully rendering white light with the external quantum efficiency of ca. Expand
Upconversion photoluminescent metal ion sensors via two photon absorption in graphene oxide quantum dots
Abstract In-depth study on upconversion photoluminescence (UCPL) of graphene oxide quantum dots (GOQDs) was presented. Uniform GOQDs with a single-layer and a circular shape within 4 nm diameter wereExpand
...
1
2
3
4
5
...

References

SHOWING 1-10 OF 45 REFERENCES
One-pot hydrothermal synthesis of graphene quantum dots surface-passivated by polyethylene glycol and their photoelectric conversion under near-infrared light
A novel and simple approach for preparing graphene quantum dots surface-passivated by polyethylene glycol (GQDs-PEG) has been developed by a one-pot hydrothermal reaction, using small graphene oxideExpand
Water-soluble fluorescent carbon quantum dots and photocatalyst design.
TLDR
The facile one-step alkali-assisted electrochemical fabrication of CQDs with sizes of 1.2– 3.8 nm which possess size-dependent photoluminescence (PL) and excellent upconversion luminescence properties are reported and the design of photocatalysts is demonstrated to harness the use of the full spectrum of sunlight. Expand
Graphene quantum dots derived from carbon fibers.
TLDR
It is reported that during the acid treatment and chemical exfoliation of traditional pitch-based carbon fibers, that are both cheap and commercially available, the stacked graphitic submicrometer domains of the fibers are easily broken down, leading to the creation of GQDs with different size distribution in scalable amounts. Expand
An electrochemical avenue to green-luminescent graphene quantum dots as potential electron-acceptors for photovoltaics.
  • Y. Li, Yue Hu, +4 authors L. Qu
  • Materials Science, Medicine
  • Advanced materials
  • 2011
TLDR
To facilitate the application of graphene in nanodevices and to effectively tune the bandgap of graphenes, a promising approach is to convert the 2D graphene sheets into 0D graphene quantum dots (GQDs). Expand
Size-dependent extinction coefficients of PbS quantum dots.
TLDR
A characterization via X-ray diffraction and high-resolution transmission electron microscopy and second-derivative analysis of the absorption spectra allowed to determine the size dependence of seven transitions in the absorption spectrum; some of these transitions were identified on the basis of their normalized confinement energy. Expand
Size-Dependent Spectroscopy of InP Quantum Dots
The spectroscopic behavior of colloidal InP quantum dots (QDs) has been investigated as a function of the mean QD diameter (which ranged from 26 to 60 A). Absorption spectra show up to three peaks orExpand
Facile preparation and upconversion luminescence of graphene quantum dots.
A facile hydrazine hydrate reduction of graphene oxide (GO) with surface-passivated by a polyethylene glycol (PEG) method for the fabrication of graphene quantum dots (GQDs) with frequencyExpand
Large, solution-processable graphene quantum dots as light absorbers for photovoltaics.
TLDR
A novel solubilization strategy for large graphene nanostructures is presented, which has enabled us to synthesize solution-processable, black graphene quantum dots with uniform size through solution chemistry, and it is shown that they can be used as sensitizers for solar cells. Expand
Strongly green-photoluminescent graphene quantum dots for bioimaging applications.
Strongly fluorescent graphene quantum dots (GQDs) have been prepared by one-step solvothermal method with PL quantum yield as high as 11.4%. The GQDs have high stability and can be dissolved in mostExpand
Colloidal chemical synthesis and characterization of InAs nanocrystal quantum dots
InAs nanocrystal quantum dots have been prepared via colloidal chemical synthesis using the reaction of InCl3 and As[Si(CH3)3]3. Sizes ranging from 25 to 60 A in diameter are produced and isolatedExpand
...
1
2
3
4
5
...