Cutting sp2 clusters in graphene sheets into colloidal graphene quantum dots with strong green fluorescence

2012 ◽  
Vol 22 (8) ◽  
pp. 3314 ◽  
Author(s):  
Dengyu Pan ◽  
Lei Guo ◽  
Jingchun Zhang ◽  
Chen Xi ◽  
Qi Xue ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Graphene Quantum Dots ◽  
Graphene Sheets ◽  
Green Fluorescence

Self-assembled nitrogen-doped graphene quantum dots (N-GQDs) over graphene sheets for superb electro-photocatalytic activity

2019 ◽  
Vol 480 ◽  
pp. 1035-1046 ◽  
Author(s):  
Rabia Riaz ◽  
Mumtaz Ali ◽  
Iftikhar Ali Sahito ◽  
Alvira Ayoub Arbab ◽  
T. Maiyalagan ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Photocatalytic Activity ◽  
Graphene Quantum Dots ◽  
Graphene Sheets ◽  
Nitrogen Doped ◽  
Nitrogen Doped Graphene ◽  
Doped Graphene ◽  
Self Assembled

Unraveling Bright Molecule-Like State and Dark Intrinsic State in Green-Fluorescence Graphene Quantum Dots via Ultrafast Spectroscopy

2013 ◽  
Vol 1 (3) ◽  
pp. 264-271 ◽  
Author(s):  
Lei Wang ◽  
Shou-Jun Zhu ◽  
Hai-Yu Wang ◽  
Ya-Feng Wang ◽  
Ya-Wei Hao ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Ultrafast Spectroscopy ◽  
Graphene Quantum Dots ◽  
Intrinsic State ◽  
Green Fluorescence

scholarly journals Facile Synthesis of Water-Soluble Graphene Quantum Dots/Graphene for Efficient Photodetector

MRS Advances ◽  
2018 ◽  
Vol 3 (15-16) ◽  
pp. 817-824 ◽  
Author(s):  
Sanju Gupta ◽  
Jared Walden ◽  
Alexander Banaszak ◽  
Sara B. Carrizosa
Keyword(s):  
Quantum Dots ◽  
Large Scale ◽  
Graphene Quantum Dots ◽  
Blue Emission ◽  
Water Soluble ◽  
Monolayer Graphene ◽  
Graphene Sheets ◽  
Scale Production ◽  
Research Activity ◽  
High Efficient

ABSTRACTGraphene quantum dots (GQDs) are zero-dimensional material with characteristics derived from functionalized graphene precursors are graphene sheets a few nanometers in the lateral dimension having a several-layer thickness. Combining the structure of graphene with the quantum confinement and edge effects, GQDs possess unique chemical behavior and physical properties. Intense research activity in GQDs is attributed to their novel phenomena of charge transport and light absorption and photoluminescence excitation. The optical transitions are known to be available up to 6 eV in GQDs, applicable for ultraviolet photonics and optoelectronics devices, biomedical imaging capabilities and technologies. We present facile hydrothermal and solvothermal methods for synthesizing homogenous dispersed and uniform sized GQDs with a strong greenish and violet blue emission peaks at ∼10-14% yield. This approach enabled a large-scale production of aqueous GQD dispersions without the need for chemical stabilizers. The structure and emission mechanism of the GQDs have been studied by combining extensive characterization techniques and rigorous control experiments. We further demonstrate the distinctive advantages of such GQDs as high-performance photodetectors (PDs). Here we also report high-efficient photocurrent (PC) behaviors consisting of multilayer GQDs sandwiched between monolayer graphene sheets. It is conceivable that the observed unique PD characteristics proved to be dominated by tunneling of charge carriers which occurs through the multiple energy states within the bandgap of GQDs, based on bias-dependent variation of the band profiles. This results in novel dark current and PC behaviors. The external quantum efficiency (η) is predicted to be 47% at applied potential 2 V. These findings highlight rich photophysics and comparable performance of graphene/graphene oxide hybrids opening up potential applications as optoelectronic devices.

Hydrothermal Route for Cutting Graphene Sheets into Blue-Luminescent Graphene Quantum Dots

2010 ◽  
Vol 22 (6) ◽  
pp. 734-738 ◽  
Author(s):  
Dengyu Pan ◽  
Jingchun Zhang ◽  
Zhen Li ◽  
Minghong Wu
Keyword(s):  
Quantum Dots ◽  
Graphene Quantum Dots ◽  
Graphene Sheets ◽  
Hydrothermal Route

Sustainable fabrication of green luminescent sulfur-doped graphene quantum dots for rapid visual detection of hemoglobin

2019 ◽  
Vol 11 (35) ◽  
pp. 4421-4430 ◽  
Author(s):  
Hai Linh Tran ◽  
Ruey-an Doong
Keyword(s):  
Quantum Dots ◽  
Visual Detection ◽  
Graphene Quantum Dots ◽  
Sensitive Detection ◽  
Green Fluorescence ◽  
Mercaptosuccinic Acid ◽  
Doped Graphene

The sulfur-doped graphene quantum dots (S-GQDs) with stable green fluorescence were successfully synthesized in the presence of glucose and mercaptosuccinic acid for rapid and sensitive detection of hemoglobin (Hb).

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