A comprehensive model of nitrogen-free ordered carbon quantum dots
Электронный научный архив УРФУ
Информация об архиве | Просмотр оригинала| Поле | Значение | |
| Заглавие |
A comprehensive model of nitrogen-free ordered carbon quantum dots
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| Автор |
Boukhvalov, D. W.
Osipov, V. Y. Hogan, B. T. Baldycheva, A. |
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| Тематика |
FLUORESCENCE
GRAPHENE NANOCRYSTALS NITROGEN OPTICAL PROPERTIES POLYCYCLIC AROMATIC HYDROCARBONS BASAL PLANES BASAL-PLANES CARBON QUANTUM DOTS COMPREHENSIVE MODELING FLUORESCENT EMISSION FUNCTIONALIZED GRAPHENE SHEETS LAYERED STRUCTURES NITROGEN-FREE CARBON OXYGEN CONTENT SEMICONDUCTOR QUANTUM DOTS |
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| Описание |
We propose and demonstrate a novel range of models to accurately determine the optical properties of nitrogen-free carbon quantum dots (CQDs) with ordered graphene layered structures. We confirm the results of our models against the full range of experimental results for CQDs available from an extensive review of the literature. The models can be equally applied to CQDs with varied sizes and with different oxygen contents in the basal planes of the constituent graphenic sheets. We demonstrate that the experimentally observed blue fluorescent emission of nitrogen-free CQDs can be associated with either small oxidised areas on the periphery of the graphenic sheets, or with sub-nanometre non-functionalised islands of sp2-hybridised carbon with high symmetry confined in the centres of oxidised graphene sheets. Larger and/or less symmetric non-functionalised regions in the centre of functionalised graphene sheet are found to be sources of green and even red fluorescent emission from nitrogen-free CQDs. We also demonstrate an approach to simplify the modelling of the discussed sp2-islands by substitution with equivalent strained polycyclic aromatic hydrocarbons. Additionally, we show that the bandgaps (and photoluminescence) of CQDs are not dependent on either out-of-plane corrugation of the graphene sheet or the spacing between sp2-islands. Advantageously, our proposed models show that there is no need to involve light-emitting polycyclic aromatic molecules (nanographenes) with arbitrary structures grafted to the particle periphery to explain the plethora of optical phenomena observed for CQDs across the full range of experimental works. © 2023, The Author(s).
Engineering and Physical Sciences Research Council, EPSRC: EP/L015331/1, EP/N035569/1; Russian Science Foundation, RSF: 21-12-00392; Ioffe Institute: 0040-2019-0013 D.W.B. acknowledges support from the Russian Science Foundation (Project No. 21-12-00392). V.Y.O. acknowledges the support from Ioffe Institute (Project No. 0040-2019-0013). AB and BTH acknowledge financial support from the Engineering and Physical Sciences Research Council (EPSRC) of the United Kingdom via the EPSRC Centre for Doctoral Training in Electromagnetic Metamaterials (Grant No. EP/L015331/1) and via Grant No. EP/N035569/1. |
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| Дата |
2024-04-05T16:38:56Z
2024-04-05T16:38:56Z 2023 |
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| Тип |
Article
Journal article (info:eu-repo/semantics/article) |info:eu-repo/semantics/publishedVersion |
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| Идентификатор |
Boukhvalov, DW, Osipov, VY, Hogan, BT & Baldycheva, A 2023, 'A comprehensive model of nitrogen-free ordered carbon quantum dots', Nanoscale Research Letters, Том. 18, № 1, 1. https://doi.org/10.1186/s11671-023-03773-0
Boukhvalov, D. W., Osipov, V. Y., Hogan, B. T., & Baldycheva, A. (2023). A comprehensive model of nitrogen-free ordered carbon quantum dots. Nanoscale Research Letters, 18(1), [1]. https://doi.org/10.1186/s11671-023-03773-0 2731-9229 Final All Open Access, Gold, Green https://www.scopus.com/inward/record.uri?eid=2-s2.0-85147094196&doi=10.1186%2fs11671-023-03773-0&partnerID=40&md5=68d8a5bd75bb82cc978d134971bf3fcd https://link.springer.com/content/pdf/10.1186/s11671-023-03773-0.pdf http://elar.urfu.ru/handle/10995/131114 10.1186/s11671-023-03773-0 85147094196 000918054400001 |
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| Язык |
en
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| Связанные ресурсы |
info:eu-repo/grantAgreement/RSF//21-12-00392
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| Права |
Open access (info:eu-repo/semantics/openAccess)
cc-by https://creativecommons.org/licenses/by/4.0/ |
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| Формат |
application/pdf
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| Источник |
Discover Nano
Discover Nano |
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