A general quantitative pH sensor developed with dicyandiamide N-doped high quantum yield graphene quantum dots

Nanoscale ◽  
2014 ◽  
Vol 6 (7) ◽  
pp. 3868-3874 ◽  
Author(s):  
Zhu Lian Wu ◽  
Ming Xuan Gao ◽  
Ting Ting Wang ◽  
Xiao Yan Wan ◽  
Lin Ling Zheng ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Citric Acid ◽  
Hydrothermal Synthesis ◽  
Quantum Yield ◽  
Graphene Quantum Dots ◽  
Ph Sensor ◽  
Ph Sensitivity ◽  
High Quantum Yield ◽  
Photoluminescence Properties ◽  
Doped Graphene

Using citric acid and dicyandiamide, through a hydrothermal synthesis, we fabricated N-doped graphene quantum dots (GQDs), which possess excellent photoluminescence properties and pH sensitivity and developed a pH sensor for environmental and intracellular application.

Highly fluorescent nitrogen-doped graphene quantum dots as a green, economical and facile sensor for the determination of sunitinib in real samples

2017 ◽  
Vol 41 (14) ◽  
pp. 6875-6882 ◽  
Author(s):  
H. Mahmood Kashani ◽  
T. Madrakian ◽  
A. Afkhami
Keyword(s):  
Quantum Dots ◽  
Graphene Quantum Dots ◽  
Blue Emission ◽  
High Quantum Yield ◽  
Real Samples ◽  
Nitrogen Doped ◽  
Synthetic Procedure ◽  
Nitrogen Doped Graphene ◽  
Doped Graphene

The preparation of nitrogen-doped graphene quantum dots (N-GQDs), by a simple and inexpensive synthetic procedure, is reported with blue emission and a high quantum yield of 78%.

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.

Triphenylphosphine modified graphene quantum dots: spectral modulation for full spectrum of visible light with high quantum yield

RSC Advances ◽  
2015 ◽  
Vol 5 (42) ◽  
pp. 33347-33350 ◽  
Author(s):  
Siwei Yang ◽  
Chong Zhu ◽  
Jing Sun ◽  
Peng He ◽  
Ningyi Yuan ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Quantum Yield ◽  
Visible Light ◽  
Graphene Quantum Dots ◽  
High Quantum Yield ◽  
Full Spectrum ◽  
Spectral Modulation ◽  
High Quantum ◽  
Modified Graphene

The spectral modulation for visible light with high quantum yield is developed based on triphenylphosphine modified graphene quantum dots.

Hydrothermal synthesis of biocompatible nitrogen doped graphene quantum dots

2021 ◽  
pp. 0958305X2098411
Author(s):  
Wan Ibtisam Wan Omar ◽  
Chin Fhong Soon ◽  
Mohd Khairul Ahmad ◽  
Masaru Shimomura
Keyword(s):  
Quantum Dots ◽  
Electronic Structure ◽  
Hydrothermal Synthesis ◽  
Density Functional ◽  
Theoretical Calculations ◽  
Graphene Quantum Dots ◽  
Biological Application ◽  
Nitrogen Doped ◽  
Nitrogen Doped Graphene ◽  
Doped Graphene

Nitrogen-doped graphene quantum dots (N-GQDs) are promising biocompatible nanomaterial which has received much attention for biological application. However, the effect of the engineered electronic structure of N-GQDs to the fluorescence of GQDs applied for bio-imaging is still under debate. In this study, N-GQDs were synthesized by a facile one-step hydrothermal method for 10 hours at 180°C and theoretical calculation of electronic structure using density functional theory (DFT) by GAUSSIAN 09, were compared. Single to multilayer of N-GQDs with the particle size of 3.2 nm in average were obtained from hydrothermal synthesis. The optical properties of N-GQDs emitted green photoluminescence (PL) at 525 nm (2.36 eV) with PL excitation (PLE) at 367 nm (3.38 eV). From DFT calculation, the optoelectronic properties of GQDs from HOMO to LUMO differ between edge functionalization and graphitic nitrogen doping. Furthermore, cells cytotoxity showed that N-GQDs possess non-toxic property, and the cells were presented with high viability. In summary, by comparing experimental and theoretical calculations, the electronic properties of N-GQDs could enhance their reactivity in photo-electronics for biological application.

scholarly journals Synthesis of Luminescent Graphene Quantum Dots with High Quantum Yield and Their Toxicity Study

PLoS ONE ◽  
2015 ◽  
Vol 10 (12) ◽  
pp. e0144906 ◽  
Author(s):  
Dan Jiang ◽  
Yunping Chen ◽  
Na Li ◽  
Wen Li ◽  
Zhenguo Wang ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Quantum Yield ◽  
Graphene Quantum Dots ◽  
Toxicity Study ◽  
High Quantum Yield ◽  
High Quantum

One-step ultrasonic synthesis of graphene quantum dots with high quantum yield and their application in sensing alkaline phosphatase

2015 ◽  
Vol 51 (5) ◽  
pp. 948-951 ◽  
Author(s):  
Yanhong Zhu ◽  
Guangfeng Wang ◽  
Hong Jiang ◽  
Ling Chen ◽  
Xiaojun Zhang
Keyword(s):  
Quantum Dots ◽  
Alkaline Phosphatase ◽  
Graphene Oxide ◽  
Quantum Yield ◽  
Graphene Quantum Dots ◽  
Label Free ◽  
High Quantum Yield ◽  
Ultrasonic Synthesis ◽  
High Quantum ◽  
One Step

With only graphene oxide and KMnO4, the luminescent graphene quantum dots (GQDs) in high quantum yield were prepared by one-step synthesis using ultrasonication, and applied in the label-free, simple and fast fluorescence assay of alkaline phosphatase (ALP).

Nitrogen-doped graphene quantum dots for 80% photoluminescence quantum yield for inorganic γ-CsPbI3 perovskite solar cells with efficiency beyond 16%

2019 ◽  
Vol 7 (10) ◽  
pp. 5740-5747 ◽  
Author(s):  
Hui Bian ◽  
Qian Wang ◽  
Siwei Yang ◽  
Changjie Yan ◽  
Haoran Wang ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Solar Cells ◽  
Quantum Yield ◽  
Graphene Quantum Dots ◽  
Perovskite Solar Cells ◽  
Nitrogen Doped ◽  
Photoluminescence Quantum Yield ◽  
Nitrogen Doped Graphene ◽  
Doped Graphene

N-GQDs with 80% PLQY are used as an EDS layer for γ-CsPbI3 PSCs, and attained a high PCE of 16.02%.

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