Influence of Group Modification at the Edges of Carbon Quantum Dots on Fluorescent Emission
Abstract We present a detailed investigation on the effect of functional group modulation at the edges of carbon quantum dots (CQDs) on the fluorescence from the CQDs. The CQDs attached by N, S, and P elements are synthesized via pyrolysis of a mixture of citric acid and NH3H2O, H2SO4, and H3PO4, re...
| Main Authors: | , , , , , , , |
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| Format: | Article |
| Language: | English |
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SpringerOpen
2019-09-01
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| Series: | Nanoscale Research Letters |
| Subjects: | |
| Online Access: | http://link.springer.com/article/10.1186/s11671-019-3079-7 |
| _version_ | 1797725444446879744 |
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| author | Ju Tang Jin Zhang Yunfei Zhang Yiming Xiao Yanli Shi Yunhua Chen Lan Ding Wen Xu |
| author_facet | Ju Tang Jin Zhang Yunfei Zhang Yiming Xiao Yanli Shi Yunhua Chen Lan Ding Wen Xu |
| author_sort | Ju Tang |
| collection | DOAJ |
| description | Abstract We present a detailed investigation on the effect of functional group modulation at the edges of carbon quantum dots (CQDs) on the fluorescence from the CQDs. The CQDs attached by N, S, and P elements are synthesized via pyrolysis of a mixture of citric acid and NH3H2O, H2SO4, and H3PO4, respectively. Thus, part of –COOH at the edges of CQDs can be converted into –C=O and functional groups such as –NH2, –SO2, –HSO3, and –H2PO4 can connect to the carbon bonds. We find that the formation of the N/S/P-CQDs can reduce the amount of –COOH that attaches to the edges of sp2-conjugated π-domains located at centers of these CQDs. This effect can result in the reduction of the non-radiative recombination for electronic transition in these CQDs. As a result, the quantum yield (QY) for fluorescence from the CQDs can be efficiently enhanced. We demonstrate experimentally that the QYs for N/S/P-CQDs can reach up to 18.7%, 29.7%, and 10.3%, respectively, in comparison to 9% for these without functional group modulation. This work can provide a practical experimental approach in improving the optical properties of fluorescent CQDs. |
| first_indexed | 2024-03-12T10:31:20Z |
| format | Article |
| id | doaj.art-0694397efc6444dc972445f47c735d21 |
| institution | Directory Open Access Journal |
| issn | 1931-7573 1556-276X |
| language | English |
| last_indexed | 2024-03-12T10:31:20Z |
| publishDate | 2019-09-01 |
| publisher | SpringerOpen |
| record_format | Article |
| series | Nanoscale Research Letters |
| spelling | doaj.art-0694397efc6444dc972445f47c735d212023-09-02T09:09:00ZengSpringerOpenNanoscale Research Letters1931-75731556-276X2019-09-0114111010.1186/s11671-019-3079-7Influence of Group Modification at the Edges of Carbon Quantum Dots on Fluorescent EmissionJu Tang0Jin Zhang1Yunfei Zhang2Yiming Xiao3Yanli Shi4Yunhua Chen5Lan Ding6Wen Xu7School of Physics and Astronomy and Key Laboratory of Quantum Information of Yunnan Province, Yunnan UniversitySchool of Physics and Astronomy and Key Laboratory of Quantum Information of Yunnan Province, Yunnan UniversitySchool of Physics and Astronomy and Key Laboratory of Quantum Information of Yunnan Province, Yunnan UniversitySchool of Physics and Astronomy and Key Laboratory of Quantum Information of Yunnan Province, Yunnan UniversitySchool of Physics and Astronomy and Key Laboratory of Quantum Information of Yunnan Province, Yunnan UniversitySchool of Physics and Astronomy and Key Laboratory of Quantum Information of Yunnan Province, Yunnan UniversitySchool of Physics and Astronomy and Key Laboratory of Quantum Information of Yunnan Province, Yunnan UniversitySchool of Physics and Astronomy and Key Laboratory of Quantum Information of Yunnan Province, Yunnan UniversityAbstract We present a detailed investigation on the effect of functional group modulation at the edges of carbon quantum dots (CQDs) on the fluorescence from the CQDs. The CQDs attached by N, S, and P elements are synthesized via pyrolysis of a mixture of citric acid and NH3H2O, H2SO4, and H3PO4, respectively. Thus, part of –COOH at the edges of CQDs can be converted into –C=O and functional groups such as –NH2, –SO2, –HSO3, and –H2PO4 can connect to the carbon bonds. We find that the formation of the N/S/P-CQDs can reduce the amount of –COOH that attaches to the edges of sp2-conjugated π-domains located at centers of these CQDs. This effect can result in the reduction of the non-radiative recombination for electronic transition in these CQDs. As a result, the quantum yield (QY) for fluorescence from the CQDs can be efficiently enhanced. We demonstrate experimentally that the QYs for N/S/P-CQDs can reach up to 18.7%, 29.7%, and 10.3%, respectively, in comparison to 9% for these without functional group modulation. This work can provide a practical experimental approach in improving the optical properties of fluorescent CQDs.http://link.springer.com/article/10.1186/s11671-019-3079-7Carbon quantum dotFunctional group modulationFluorescent emission |
| spellingShingle | Ju Tang Jin Zhang Yunfei Zhang Yiming Xiao Yanli Shi Yunhua Chen Lan Ding Wen Xu Influence of Group Modification at the Edges of Carbon Quantum Dots on Fluorescent Emission Nanoscale Research Letters Carbon quantum dot Functional group modulation Fluorescent emission |
| title | Influence of Group Modification at the Edges of Carbon Quantum Dots on Fluorescent Emission |
| title_full | Influence of Group Modification at the Edges of Carbon Quantum Dots on Fluorescent Emission |
| title_fullStr | Influence of Group Modification at the Edges of Carbon Quantum Dots on Fluorescent Emission |
| title_full_unstemmed | Influence of Group Modification at the Edges of Carbon Quantum Dots on Fluorescent Emission |
| title_short | Influence of Group Modification at the Edges of Carbon Quantum Dots on Fluorescent Emission |
| title_sort | influence of group modification at the edges of carbon quantum dots on fluorescent emission |
| topic | Carbon quantum dot Functional group modulation Fluorescent emission |
| url | http://link.springer.com/article/10.1186/s11671-019-3079-7 |
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