Effect of nitrogen doping on the photoluminescence intensity of graphene quantum dots

2017 ◽  
Vol 42 (18) ◽  
pp. 3642 ◽  
Author(s):  
Svette Reina Merden Santiago ◽  
Yee Ann Wong ◽  
Tzu-Neng Lin ◽  
Chiao-Hsin Chang ◽  
Chi-Tsu Yuan ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Nitrogen Doping ◽  
Graphene Quantum Dots ◽  
Photoluminescence Intensity

Synthesis, Photoluminescence and Bio-Targeting Applications of Blue Graphene Quantum Dots

2016 ◽  
Vol 16 (4) ◽  
pp. 3457-3467 ◽  
Author(s):  
Jigang Wang ◽  
Ji Zhou ◽  
Wenhua Zhou ◽  
Jilong Shi ◽  
Lun Ma ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Graphene Oxide ◽  
Sodium Hydroxide ◽  
Heating Temperature ◽  
Thin Sheet ◽  
Graphene Quantum Dots ◽  
Photoluminescence Intensity ◽  
Cytotoxic Effects ◽  
Different Temperatures ◽  
Blue Photoluminescence

Chemical derived graphene oxide, an atomically thin sheet of graphite with two-dimensional construction, offers interesting physical, electronic, thermal, chemical, and mechanical properties that are currently being explored for advanced physics electronics, membranes, and composites. Herein, we study graphene quantum dots (GQD) with the blue photoluminescence under various parameters. The GQD samples were prepared at different temperatures, and the blue photoluminescence intensity of the solution improved radically as the heating temperatures increased. Concerning PL peak and intensity of the quantum dots, the results demonstrated dependence on time under heating, temperature of heating, and pH adjusted by the addition of sodium hydroxide. After hydrothermal synthesis routes, the functional groups of graphene oxide were altered the morphology showed the stacking configuration, and self-assembled structure of the graphene sheets with obvious wrinkles appeared at the edge structures. In addition, absorption, PL, and PLE spectra of the graphene quantum dots increase with different quantities of sodium hydroxide added. Finally, using GQD to target PNTIA cells was carried out successfully. High uptake efficiency and no cytotoxic effects indicate graphene quantum dots can be suitable for bio-targeting.

Doping: Versatile Graphene Quantum Dots with Tunable Nitrogen Doping (Part. Part. Syst. Charact. 5/2014)

2014 ◽  
Vol 31 (5) ◽  
pp. 509-509 ◽  
Author(s):  
Yunqian Dai ◽  
Huan Long ◽  
Xiaotian Wang ◽  
Yueming Wang ◽  
Qing Gu ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Nitrogen Doping ◽  
Graphene Quantum Dots

Temperature-dependent Raman investigation and photoluminescence of graphene quantum dots with and without nitrogen-doping

2020 ◽  
Vol 56 (8) ◽  
pp. 4979-4990
Author(s):  
Pham Nam Thang ◽  
Le Xuan Hung ◽  
Dao Nguyen Thuan ◽  
Nguyen Hai Yen ◽  
Nguyen Thi Thuc Hien ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Nitrogen Doping ◽  
Graphene Quantum Dots ◽  
Temperature Dependent

Enhancing the Fluorescence of Graphene Quantum Dots with a Oxidation Way

2014 ◽  
Vol 887-888 ◽  
pp. 156-160 ◽  
Author(s):  
Ting Han ◽  
Xue Jiao Zhou ◽  
Xiao Chen Wu
Keyword(s):  
Quantum Dots ◽  
Fenton Reaction ◽  
Graphene Quantum Dots ◽  
Quantum Yields ◽  
Photoluminescence Intensity ◽  
Oxidation Treatment ◽  
Fluorescence Quantum Yields ◽  
Bright Yellow ◽  
Simple Pathway ◽  
Green Fluorescent

It is a facile and efficient way to produce grapheme quantum dots (GQDs) through photo-Fenton reaction. However, the fluorescence of the as-generated GQDs is weak. Here, bright yellow-green fluorescent graphene quantum dots (GQDs) were prepared by post-oxidation of the GQDs with H2O2. The fluorescence quantum yields of the post-oxidized GQDs (O-GQDs) increased from 0.08% to 3.3% and the maximum emission wavelength shifted from 450 to 510 nm. The O-GQDs exhibit excitation-independent and pH-dependent photoluminescence behaviors. The increase of the photoluminescence intensity is attributed to the more carbonyl and carboxyl groups after the post-oxidation. The post-oxidation treatment offers a simple pathway to enhance the fluorescence of GQDs.

Effect of nitrogen doping on the structural and the optical variations of graphene quantum dots by using hydrazine treatment

2015 ◽  
Vol 67 (4) ◽  
pp. 746-751 ◽  
Author(s):  
Sung Kim ◽  
Dong Hee Shin ◽  
Chang Oh Kim ◽  
Soo Seok Kang ◽  
Kyeong Won Lee ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Nitrogen Doping ◽  
Graphene Quantum Dots
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