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ID 48647
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著者
Ogi, Takashi 大学院工学研究科 広大研究者総覧
Iwasaki, Hideharu
Aishima, Kana
Iskandar, Ferry
Wang, Wei-Ning
Takimiya, Kazuo
Okuyama, Kikuo 大学院工学研究院
抄録(英)
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%.
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.
掲載誌名
RSC Advances
4巻
99号
開始ページ
55709
終了ページ
55715
出版年月日
2014-10-21
出版者
Royal Society of Chemistry
ISSN
2046-2069
出版者DOI
言語
英語
NII資源タイプ
学術雑誌論文
広大資料タイプ
学術雑誌論文
DCMIタイプ
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application/pdf
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権利情報
This journal is © The Royal Society of Chemistry 2014.
関連情報URL
部局名
工学研究科