Journal of Nanomaterials & Molecular NanotechnologyISSN: 2324-8777

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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: [email protected]
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.

Keywords: Graphene quantum dots; Functionalization; Doping; Photoluminescence

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