Spanish 
Chinese 
Russian 
German 
French 
Japanese 
Portuguese 
Hindi Research Article, J Nanomater Mol Nanotechnol Vol: 6 Issue: 2
Photoluminescence in Functionalized/Doped Graphene Quantum Dots: Role of Surface States
| Uliana Salgaeva1, Rong Zhao2, Sergey Mushinsky1, Jacek Jasinski2, Xiao-An Fu3, Victor Henner1, Ruchira Dharmasena2,4 and Gamini Sumanasekera2,4* | |
| 1Department of Physics, Perm State University Perm, 614990, Russia | |
| 2Conn Center for Renewable Energy, University of Louisville, Louisville, KY 40292, USA | |
| 3Department of Chemical Engineering, University of Louisville, Louisville, KY 40292, USA | |
| 4Department of Physics & Astronomy, University of Louisville, Louisville, KY 40292, USA | |
| Corresponding author : Gamini Sumanasekera
Conn Center for Renewable Energy, University of Louisville, Louisville, KY 40292, USA Tel: +1 502 852 1558 E-mail: gusuma01@louisville.edu |
|
| Received: February 15 2017 Accepted: March 15, 2017 Published: March 20, 2017 | |
| Citation: Salgaeva U, Zhao R, Mushinsky S, Jasinski J, Fu XA, et al. (2017) Photoluminescence in Functionalized/Doped Graphene Quantum Dots: Role of Surface States. J Nanomater Mol Nanotechnol 6:2.doi:10.4172/2324-8777.1000215 |
Abstract
Photoluminescence in Functionalized/Doped Graphene Quantum Dots: Role of Surface States
It has been shown that functionalization/doping of Graphene Quantum Dots (GQDs) can lead to further tuning of their already existing band gap. We have successfully functionalized GQDs (synthesized by hydrothermal process) with oxygen, hydrogen, fluorine, and doped with nitrogen using capacitively coupled plasma of respective gas as evidenced by Raman and X-ray photo emission spectroscopy (XPS). Room temperature photoluminescence (PL) of each functionalized GQD shows distinctive features and can be explained as due to charge transfers between the functional groups/dopants and GQDs as well as presence of mid gap states as a result of functionalization and doping. An energy diagram model is proposed to elucidate the PL modulation resulting from functionalization and doping.
