- Title
- Time-dependent characterization of graphene quantum dots and graphitic carbon nitride quantum dots synthesized by hydrothermal methods
- Creator
- Nxele, Siphesihle Robin
- Creator
- Nyokong, Tebello
- Subject
- To be catalogued
- Date Issued
- 2022
- Date
- 2022
- Type
- text
- Type
- article
- Identifier
- http://hdl.handle.net/10962/230917
- Identifier
- vital:49831
- Identifier
- xlink:href="https://doi.org/10.1016/j.diamond.2021.108751"
- Description
- We report on the facile synthesis of graphene quantum dots (GQDs), nitrogen-doped quantum dots (NGQDs) and graphitic carbon nitride quantum dots (gCNQDs) by the bottom-up hydrothermal synthetic process. The time is varied to study its effects on the structural, hydrodynamic and optical properties of these nanostructures. The techniques used to characterize these nanostructures were transmission electron microscopy, X-ray diffractometry, dynamic light scattering, and zetametry (zeta potential), and by energy dispersive X-ray, UV/vis, fluorescence, Fourier transform infrared, Raman and X-ray photoelectron spectroscopies. For gCNQDs and NGQDs, Raman spectroscopy showed an increase in disorder with synthesis time, indicating introduction of more triazine groups for the former and increase in doping with the N atoms for the latter, hence higher temperatures are recommended. For GQDs, Raman spectra showed an increase in the spatial order of the π-conjugated structure with synthesis time. Considering all the techniques employed in this work, the synthesis times of 6h and 8 h are recommended for GQDs and NGQDs.
- Format
- computer
- Format
- online resource
- Format
- application/pdf
- Format
- 1 online resource (13 pages)
- Format
- Publisher
- Elsevier
- Language
- English
- Relation
- Diamond and Related Materials
- Relation
- Nxele, S.R. and Nyokong, T., 2022. Time-dependent characterization of graphene quantum dots and graphitic carbon nitride quantum dots synthesized by hydrothermal methods. Diamond and Related Materials, 121, p.108751
- Relation
- Diamond and Related Materials volume 121 p. 108751 2022 0925-9635
- Rights
- Publisher
- Rights
- Use of this resource is governed by the terms and conditions of the Elsevier Terms and Conditions Statement (https://www.elsevier.com/legal/elsevier-website-terms-and-conditions)
- Rights
- Closed Access
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Collections
RU DST/NRF SARChI for Medicinal Chemistry and Nanotechnology
Nyokong, Tebello (Distinguished Professor)
RU Department of Chemistry
| Thumbnail | File | Description | Size | Format | |||
|---|---|---|---|---|---|---|---|
| View Details Download | SOURCE1 | Time-dependent characterization of graphene quantum dots.pdf | 828 KB | Adobe Acrobat PDF | View Details Download |