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

Hydrothermal route to graphene quantum dots: Effects of precursor and temperature

2017 ◽  
Vol 79 ◽  
pp. 112-118 ◽  
Author(s):  
Jian-De Xie ◽  
Gui-Wen Lai ◽  
Mohammad Mahmudul Huq
Keyword(s):  
Quantum Dots ◽  
Graphene Quantum Dots ◽  
Hydrothermal Route

scholarly journals Role of C–N Configurations in the Photoluminescence of Graphene Quantum Dots Synthesized by a Hydrothermal Route

2016 ◽  
Vol 6 (1) ◽  
Author(s):  
Fitri Aulia Permatasari ◽  
Akfiny Hasdi Aimon ◽  
Ferry Iskandar ◽  
Takashi Ogi ◽  
Kikuo Okuyama
Keyword(s):  
Quantum Dots ◽  
Graphene Quantum Dots ◽  
Hydrothermal Route

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

scholarly journals The Synergistic Effect of Pyridinic Nitrogen and Graphitic Nitrogen of Nitrogen-Doped Graphene Quantum Dots for Enhanced TiO2 Nanocomposites’ Photocatalytic Performance

Catalysts ◽  
2018 ◽  
Vol 8 (10) ◽  
pp. 438 ◽  
Author(s):  
Fei Li ◽  
Ming Li ◽  
Yi Luo ◽  
Ming Li ◽  
Xinyu Li ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Photocatalytic Performance ◽  
Uv Light ◽  
Graphene Quantum Dots ◽  
Hydrothermal Route ◽  
Ammonia Water ◽  
Nitrogen Doped ◽  
Nitrogen Doped Graphene ◽  
Doped Graphene ◽  
Pyridinic N

In this study, nitrogen-doped graphene quantum dots (N-GQDs) and a TiO2 nanocomposite were synthesized using a simple hydrothermal route. Ammonia water was used as a nitrogen source to prepare the N-GQDs. When optically characterized by UV-vis, N-GQDs reveal stronger absorption peaks in the range of ultraviolet (UV) light than graphene quantum dots (GQDs). In comparison with GQDs/TiO2 and pure TiO2, the N-GQDs/TiO2 have significantly improved photocatalytic performance. In particular, it was found that, when the added amount of ammonia water was 50 mL, the content of pyridinic N and graphitic N were as high as 22.47% and 31.44%, respectively. Most important, the photocatalytic activity of N-GQDs/TiO2-50 was about 95% after 12 min. The results illustrated that pyridinic N and graphitic N play a significant role in photocatalytic performance.

Sustainable synthesis of single crystalline sulphur-doped graphene quantum dots for bioimaging and beyond

2018 ◽  
Vol 20 (18) ◽  
pp. 4245-4259 ◽  
Author(s):  
Sujata Sangam ◽  
Apoorv Gupta ◽  
Adeeba Shakeel ◽  
Rohan Bhattacharya ◽  
Arun Kumar Sharma ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Quantum Yield ◽  
Graphene Quantum Dots ◽  
Hydrothermal Route ◽  
Single Crystalline ◽  
Doped Graphene

Waste-driven single crystalline sulphur-doped GQDs are synthesized via a green hydrothermal route with the highest quantum yield and excellent biocompatibility for bioimaging.

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.

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