Transient nature of graphene quantum dot formation via a hydrothermal reaction
RSC Advances 4 巻 99 号
55709-55715 頁
2014-10-21 発行
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| ファイル情報(添付) | |
| タイトル ( eng ) |
Transient nature of graphene quantum dot formation via a hydrothermal reaction
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| 作成者 |
Iwasaki Hideharu
Aishima Kana
Iskandar Ferry
Wang Wei-Ning
Takimiya Kazuo
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| 収録物名 |
RSC Advances
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| 巻 | 4 |
| 号 | 99 |
| 開始ページ | 55709 |
| 終了ページ | 55715 |
| 抄録 |
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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| 内容記述 |
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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| 言語 |
英語
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| 資源タイプ | 学術雑誌論文 |
| 出版者 |
Royal Society of Chemistry
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| 発行日 | 2014-10-21 |
| 権利情報 |
This journal is © The Royal Society of Chemistry 2014.
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| 出版タイプ | Version of Record（出版社版。早期公開を含む） |
| アクセス権 | オープンアクセス |
| 収録物識別子 |
[DOI] 10.1039/C4RA09159K
[DOI] https://doi.org/10.1039/C4RA09159K
[ISSN] 2046-2069
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