Transient nature of graphene quantum dot formation via a hydrothermal reaction
RSC Advances Volume 4 Issue 99
Page 55709-55715
published_at 2014-10-21
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| File | |
| Title ( eng ) |
Transient nature of graphene quantum dot formation via a hydrothermal reaction
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| Creator |
Iwasaki Hideharu
Aishima Kana
Iskandar Ferry
Wang Wei-Ning
Takimiya Kazuo
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| Source Title |
RSC Advances
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| Volume | 4 |
| Issue | 99 |
| Start Page | 55709 |
| End Page | 55715 |
| Abstract |
A facile, economic and environmentally friendly one-step approach for the preparation of highly luminescent graphene quantum dots (GQDs) was developed using a hydrothermal reaction between citric acid and urea. Unlike previous reports, we focused on the effect of the transient nature of GQD formation on the photoluminescence (PL) properties and molecular structure changes of the products. We found that the GQDs have an optimum reaction time and require an effective precursor to achieve excellent luminescent properties. The PL, ultraviolet-visible (UV-vis) absorption, zeta potential, and nuclear magnetic resonance (NMR) analyses of the GQDs prepared at various reaction times revealed that the molecular structures responsible for the luminescence of the GQDs are aggregates or condensation products of citric acid amides. We found that urea addition to the precursor drastically enhances the PL intensity of the GQDs, and it is 40 times higher than those prepared using the pure citric acid precursor. Additionally, a GQDs–polyvinyl alcohol composite achieved an excellent quantum yield (QY) of 43.6%.
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| Descriptions |
This work was supported by JSPS KAKENHI Grant numbers 26709061 and 24656413. We thank Dr Eishi Tanabe from the Hiroshima Prefectural Institute of Industrial Science and Technology for helping with TEM analyses, and Drs Naoya Tochio and Junichi Kakimura from Hiroshima University for NMR analyses.
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| Language |
eng
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| Resource Type | journal article |
| Publisher |
Royal Society of Chemistry
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| Date of Issued | 2014-10-21 |
| Rights |
This journal is © The Royal Society of Chemistry 2014.
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| Publish Type | Version of Record |
| Access Rights | open access |
| Source Identifier |
[DOI] 10.1039/C4RA09159K
[DOI] https://doi.org/10.1039/C4RA09159K
[ISSN] 2046-2069
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