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.

Electrolyzing synthesis of boron-doped graphene quantum dots for fluorescence determination of Fe3+ ions in water samples

Talanta ◽  
2017 ◽  
Vol 164 ◽  
pp. 100-109 ◽  
Author(s):  
Li Chen ◽  
Chuanli Wu ◽  
Pan Du ◽  
Xiaowei Feng ◽  
Ping Wu ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Water Samples ◽  
Graphene Quantum Dots ◽  
Boron Doped ◽  
Fluorescence Determination ◽  
Doped Graphene

Tuning the electronic and optical properties of hexagonal boron-nitride nanosheet by inserting graphene quantum dots

2018 ◽  
Vol 32 (06) ◽  
pp. 1850084 ◽  
Author(s):  
Yi-Min Ding ◽  
Jun-Jie Shi ◽  
Min Zhang ◽  
Meng Wu ◽  
Hui Wang ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Optical Properties ◽  
Boron Nitride ◽  
Hexagonal Boron Nitride ◽  
Graphene Quantum Dots ◽  
Band Gaps ◽  
Hybrid Structures ◽  
Electronic And Optical Properties ◽  
Boron Nitride Nanosheet ◽  
Optoelectronic Nanodevices

It is difficult to integrate two-dimensional (2D) graphene and hexagonal boron-nitride (h-BN) in optoelectronic nanodevices, due to the semi-metal and insulator characteristic of graphene and h-BN, respectively. Using the state-of-the-art first-principles calculations based on many-body perturbation theory, we investigate the electronic and optical properties of h-BN nanosheet embedded with graphene dots. We find that C atom impurities doped in h-BN nanosheet tend to phase-separate into graphene quantum dots (QD), and BNC hybrid structure, i.e. a graphene dot within a h-BN background, can be formed. The band gaps of BNC hybrid structures have an inverse relationship with the size of graphene dot. The calculated optical band gaps for BNC structures vary from 4.71 eV to 3.77 eV, which are much smaller than that of h-BN nanosheet. Furthermore, the valence band maximum is located in C atoms bonded to B atoms and conduction band minimum is located in C atoms bonded to N atoms, which means the electron and hole wave functions are closely distributed around the graphene dot. The bound excitons, localized around the graphene dot, determine the optical spectra of the BNC hybrid structures, in which the exciton binding energies decrease with increase in the size of graphene dots. Our results provide an important theoretical basis for the design and development of BNC-based optoelectronic nanodevices.

Boron-doped graphene quantum dots: an efficient photoanode for a dye sensitized solar cell

2019 ◽  
Vol 43 (36) ◽  
pp. 14313-14319 ◽  
Author(s):  
Vijaya Prabhagar. M. ◽  
M. Praveen Kumar ◽  
Chisato Takahashi ◽  
Subrata Kundu ◽  
Tharangattu N. Narayanan ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Solar Cell ◽  
Graphene Quantum Dots ◽  
Cost Effective ◽  
Dye Sensitized Solar Cell ◽  
Graphene Quantum Dot ◽  
Dye Sensitized ◽  
Boron Doped ◽  
Microwave Reactor ◽  
Doped Graphene

A cost effective boron doped graphene quantum dot from boron carbide graphene by microwave reactor assisted process that can tune the properties of metal oxides for DSSC application is proposed by D. K. Pattanayak, S. Kundu, T. N. Narayanan and co-workers.

Boron-doped Graphene quantum dots modified electrode for electrochemistry and electrocatalysis of hemoglobin

2018 ◽  
Vol 823 ◽  
pp. 137-145 ◽  
Author(s):  
Wei Chen ◽  
Wenju Weng ◽  
Xueliang Niu ◽  
Xiaoyan Li ◽  
Yongling Men ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Modified Electrode ◽  
Graphene Quantum Dots ◽  
Boron Doped ◽  
Doped Graphene

Electronic and optical properties of semiconductor and graphene quantum dots

2011 ◽  
Vol 7 (3) ◽  
pp. 328-352 ◽  
Author(s):  
Wei-dong Sheng ◽  
Marek Korkusinski ◽  
Alev Devrim Güçlü ◽  
Michal Zielinski ◽  
Pawel Potasz ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Optical Properties ◽  
Graphene Quantum Dots ◽  
Electronic And Optical Properties

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.

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