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Please use this identifier to cite or link to this item: http://repository.iitr.ac.in/handle/123456789/14699
Title: Effect of sulfur doping on fluorescence and quantum yield of graphene quantum dots: An experimental and theoretical investigation
Authors: Kadian S.
Manik G.
Kalkal A.
Singh M.
Chauhan R.P.
Published in: Nanotechnology
Abstract: Graphene quantum dots (GQDs) are one of the most promising luminescent carbon derived nanomaterials decorated with multiple useful functional groups and remarkable optoelectronic properties. Heteroatom doping of hexagonal carbon sheet of GQDs is an effective strategy to tailor their properties to meet desired application. In this work, sulfur doped GQDs (S-GQDs) were synthesized by simply pyrolyzing citric acid (CA) as a source of carbon and 3-Mercaptopropionic acid as a source of sulfur dopant. The optimal reaction conditions (ratio of the carbon to dopant source, temperature and time of reaction) were obtained while investigating their effect on the quantum yield and fluorescence properties of GQDs and, are hereby, reported for the first time. The as-synthesized S-GQDs were extensively characterized by different analytical techniques such as transmission electron microscopy (TEM), UV-vis Spectroscopy (UV), Fourier transform infrared spectroscopy, photoluminescence (PL) and x-ray Photoelectron Spectroscopy. S-GQDs were found uniform in size (∼4 nm) and spherical in shape with strong blue fluorescence. Further, for in-depth analysis of experimental results and underlying phenomena, theoretical studies based on density functional theory were performed for chemical structure optimization, possible sites of doping and density of states calculation. The synthesized S-GQDs exhibited excellent solubility in water, a stronger fluorescence and desirably higher quantum yield (57.44%) as compared to that of previously reported undoped GQDs. These successfully demonstrated unique and improved properties of S-GQDs present them as a potential candidate for biomedical, optical, electrical and chemical applications. © 2019 IOP Publishing Ltd.
Citation: Nanotechnology (2019), 30(43): -
URI: https://doi.org/10.1088/1361-6528/ab3566
http://repository.iitr.ac.in/handle/123456789/14699
Issue Date: 2019
Publisher: Institute of Physics Publishing
Keywords: density of states
fluorescence
heteroatom doping
quantum yield
sulfur doped GQDs
ISSN: 9574484
Author Scopus IDs: 57203985194
56595314900
57210786470
57213653968
7103093286
Author Affiliations: Kadian, S., Department of Polymer and Process Engineering, Indian Institute of Technology Roorkee, Uttarakhand, India
Manik, G., Department of Polymer and Process Engineering, Indian Institute of Technology Roorkee, Uttarakhand, India
Kalkal, A., Department of Biotechnology, Indian Institute of Technology Roorkee, Uttarakhand, India
Singh, M., Department of Polymer and Process Engineering, Indian Institute of Technology Roorkee, Uttarakhand, India
Chauhan, R.P., Department of Physics, National Institute of Technology Kurukshetra, Kurukshetra, India
Corresponding Author: Manik, G.; Department of Polymer and Process Engineering, Indian Institute of Technology RoorkeeIndia; email: manikfpt@iitr.ac.in
Appears in Collections:Journal Publications [PE]

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