Synthesis of photoluminescent N doped and S doped carbon graphene quantum dots with modified optical properties

Graphene quantum dots (GQDs) are a new class of materials that have replaced the conventional bimetallic dots with their unique properties. In the present study GQDs, N doped GQDs (N-GQDs) and S doped GQDs (S-GQDs) are synthesized by in-situ one step method of pyrolysis of citric acid (bottom up tec...

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Bibliographic Details
Published in:Journal of materials science. Materials in electronics 2023-10, Vol.34 (28), p.1955, Article 1955
Main Authors: Khan, Salma, Narula, Anudeep Kumar
Format: Article
Language:English
Subjects:
Bimetals
Carbon
Characterization and Evaluation of Materials
Chemistry and Materials Science
Citric acid
Electrochemical impedance spectroscopy
Electrodes
Electrons
Graphene
Materials Science
Optical and Electronic Materials
Optical properties
Photoluminescence
Pyrolysis
Quantum dots
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Summary:Graphene quantum dots (GQDs) are a new class of materials that have replaced the conventional bimetallic dots with their unique properties. In the present study GQDs, N doped GQDs (N-GQDs) and S doped GQDs (S-GQDs) are synthesized by in-situ one step method of pyrolysis of citric acid (bottom up technique). The fabrication of florescent GQDs and doped GQDs with heteroatom N and S are evidently supported with transmission electron microscopy (TEM) and FT-IR. The mechanism of the photoluminescence in these quantum dots is investigated thorough the photoluminescence spectroscopy (PL) which was further reinforced by the electrochemical impedance spectroscopy (EIS) and with cyclic voltammetry. N-GQDs shows blue colored emission while S-GQDs shows relatively longer wavelength yellow green colored emission. Emission from the defective surface sites of the doped GQDs was confirmed from the proposed mechanism of PL of these dots.
ISSN:0957-4522
1573-482X
DOI:10.1007/s10854-023-11363-0