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Tuning the Wettability and Photoluminescence of Graphene Quantum Dots via Covalent Modification

Abstract

Tuning the photoluminescence of graphene quantum dots (GQDs) through modulation of the bandgap and chemical doping is important for the GQDs use in optoelectronic devices. In this paper, tuning of dual properties of graphene quantum dots, i.e., wettability(hydrophilic to hydrophobic) and photoluminescence are demonstrated. We synthesized graphene quantum dots(GQDs) and alkylated graphene quantum dots(C12-GQDs) by simple chemical exfoliation(top down technique) of graphite nanopowder. The synthesized GQDs due to the presence of oxygenated functional moieties are highly hydrophilic. We successfully functionalized covalently with a dodecyl amine(DDA) and simultaneously reduced with glycine to render hydrophobicity on GQDs surface. Here the glycine plays a dual role as a chemical functionalized and reducing agent. All the characterization of GQDs and C12-GQDs are carried out by UV-Visible absorption Spectrophotometer, Scanning Electron Microscopy, Fourier Transform Infrared Spectrophotometer, Dynamic Light Scattering, Raman spectroscopy and contact angle analyzer. Interestingly after covalent modification, we also observe the tuning of photoluminescence (green to blue) of GQDs. Thus, we can easily tune the dual properties, i.e., wettability and photoluminescence of GQDs by simply covalent modification with long chain alkyl (-C12H27) groups.

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Publication details

The article was received on 30 Aug 2017, accepted on 10 Nov 2017 and first published on 13 Nov 2017


Article type: Paper
DOI: 10.1039/C7NJ03280C
Citation: New J. Chem., 2017, Accepted Manuscript
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    Tuning the Wettability and Photoluminescence of Graphene Quantum Dots via Covalent Modification

    M. J. Deka, A. Dutta and D. Chowdhury, New J. Chem., 2017, Accepted Manuscript , DOI: 10.1039/C7NJ03280C

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