Sulphur doping: a facile approach to tune the electronic structure and optical properties of graphene quantum dots

Nanoscale ◽  
2014 ◽  
Vol 6 (10) ◽  
pp. 5323-5328 ◽  
Author(s):  
Xueming Li ◽  
Shu Ping Lau ◽  
Libin Tang ◽  
Rongbin Ji ◽  
Peizhi Yang
Keyword(s):  
Quantum Dots ◽  
Optical Properties ◽  
Electronic Structure ◽  
Graphene Quantum Dots ◽  
Doped Graphene

Sulphur-doped graphene quantum dots emit a variety of colours.

scholarly journals Ultrafast ammonia-driven, microwave-assisted synthesis of nitrogen-doped graphene quantum dots and their optical properties

Nanophotonics ◽  
2017 ◽  
Vol 6 (1) ◽  
pp. 259-267 ◽  
Author(s):  
Binjie Zheng ◽  
Yuanfu Chen ◽  
Pingjian Li ◽  
Zegao Wang ◽  
Bingqiang Cao ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Optical Properties ◽  
Graphene Quantum Dots ◽  
Microwave Assisted Synthesis ◽  
Scale Production ◽  
Excitation Spectra ◽  
Nitrogen Doped ◽  
Microwave Assisted ◽  
Nitrogen Doped Graphene ◽  
Doped Graphene

AbstractFor the first time, a facile, ultrafast, ammonia-driven microwave-assisted synthesis of high-quality nitrogen-doped graphene quantum dots (NGQDs) at room temperature and atmospheric pressure is presented. This one-step method is very cheap, environment friendly, and suitable for large-scale production. The as-synthesized NGQDs consisting of one to three graphene monolayers exhibit highly crystalline quality with an average size of 5.3 nm. A new fluorescence (FL) emission peak at 390 nm is observed, which might be attributed to the doped nitrogen atoms into the GQDs. An interesting red-shift is observed by comparing the FL excitation spectra to the UV-visible absorption spectra. Based on the optical properties, the detailed Jablonski diagram representing the energy level structure of NGQDs is derived.

Synthesis and optical properties of nitrogen and sulfur co-doped graphene quantum dots

2014 ◽  
Vol 38 (9) ◽  
pp. 4615-4621 ◽  
Author(s):  
Ben-Xing Zhang ◽  
Hui Gao ◽  
Xiao-Long Li
Keyword(s):  
Quantum Dots ◽  
Optical Properties ◽  
Graphene Quantum Dots ◽  
Water Soluble ◽  
Soluble Nitrogen ◽  
Doped Graphene ◽  
Co Doped

Schematic and digital photos of the preparation for water-soluble nitrogen (N) and sulfur (S) co-doped graphene quantum dots (NS-GQDs). Sulfur enhances the photoluminescence of NS-GQDs.

scholarly journals Nitrogen and phosphorus co-doped graphene quantum dots: synthesis from adenosine triphosphate, optical properties, and cellular imaging

Nanoscale ◽  
2015 ◽  
Vol 7 (17) ◽  
pp. 8159-8165 ◽  
Author(s):  
Arundithi Ananthanarayanan ◽  
Yue Wang ◽  
Parimal Routh ◽  
Mahasin Alam Sk ◽  
Aung Than ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Optical Properties ◽  
Molecular Imaging ◽  
Adenosine Triphosphate ◽  
Graphene Quantum Dots ◽  
Cellular Imaging ◽  
Live Cells ◽  
Nitrogen And Phosphorus ◽  
Doped Graphene ◽  
Co Doped

N/P co-doped graphene quantum dots are synthesized, characterized, and used for specific molecular imaging and tracking in live cells.

N-Doped Graphene Quantum Dots Using Different Bases

2019 ◽  
Vol 18 (01) ◽  
pp. 1850017
Author(s):  
M. Jaya Prakash Naik ◽  
Sourajit Mohanta ◽  
Peetam Mandal ◽  
Mitali Saha
Keyword(s):  
Quantum Dots ◽  
Particle Size ◽  
Optical Properties ◽  
Graphene Quantum Dots ◽  
Ammonium Hydroxide ◽  
Particle Size Analyzer ◽  
Vis Spectroscopy ◽  
Doped Graphene ◽  
Formation Conditions

Photoluminescent graphene quantum dots (GQDs) have received tremendous attention due to their sui generis chemical, electronic and optical properties but fabricating the pristine quality of GQD is extremely challenging. Herein, we have reported the pyrolysis of citric acid which in the presence of different bases viz. triethylamine, ammonium hydroxide and urea, produced N-doped GQDs at different pH. The effect of different pH has been studied in detail to optimize the formation conditions of the GQD. Ultraviolet–visible (UV–Vis) spectroscopy and normalized fluorescence spectra were applied to analyze the optical properties of the GQD. The mean particle size was analyzed by a particle size analyzer (dynamic light dispersion).

Tuning the electronic and optical properties of graphene quantum dots by selective boronization

2019 ◽  
Vol 7 (2) ◽  
pp. 237-246 ◽  
Author(s):  
Jianguang Feng ◽  
Hongzhou Dong ◽  
Beili Pang ◽  
Yingjie Chen ◽  
Liyan Yu ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Optical Properties ◽  
Graphene Quantum Dots ◽  
Electronic And Optical Properties ◽  
Boron Doped ◽  
Doped Graphene

BC3, BCO2, and BC2O show different behaviours in tuning the electronic and optical properties of boron-doped graphene quantum dots.

Nitrogen-doped graphene quantum dots: Optical properties modification and photovoltaic applications

Nano Research ◽  
2019 ◽  
Vol 12 (5) ◽  
pp. 1041-1047 ◽  
Author(s):  
Md Tanvir Hasan ◽  
Roberto Gonzalez-Rodriguez ◽  
Conor Ryan ◽  
Kristof Pota ◽  
Kayla Green ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Optical Properties ◽  
Graphene Quantum Dots ◽  
Nitrogen Doped ◽  
Photovoltaic Applications ◽  
Nitrogen Doped Graphene ◽  
Doped Graphene

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.

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