An insight into electronic and optical properties of multilayer graphene quantum dots synthesized by hydrothermal approach

2018 ◽  
Vol 239 ◽  
pp. 36-42 ◽  
Author(s):  
Shikha Jindal ◽  
Sushama M. Giripunje
2018 ◽  
Vol 32 (06) ◽  
pp. 1850084 ◽  
Author(s):  
Yi-Min Ding ◽  
Jun-Jie Shi ◽  
Min Zhang ◽  
Meng Wu ◽  
Hui Wang ◽  
...  

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.


2011 ◽  
Vol 7 (3) ◽  
pp. 328-352 ◽  
Author(s):  
Wei-dong Sheng ◽  
Marek Korkusinski ◽  
Alev Devrim Güçlü ◽  
Michal Zielinski ◽  
Pawel Potasz ◽  
...  

2019 ◽  
Vol 7 (2) ◽  
pp. 237-246 ◽  
Author(s):  
Jianguang Feng ◽  
Hongzhou Dong ◽  
Beili Pang ◽  
Yingjie Chen ◽  
Liyan Yu ◽  
...  

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


2020 ◽  
Vol 22 (48) ◽  
pp. 28230-28237
Author(s):  
Min Yang ◽  
Zan Lian ◽  
Chaowei Si ◽  
Bo Li

The tunable electronic and optical properties of graphene quantum dots achieved by nitrogen doping


Sign in / Sign up

Export Citation Format

Share Document