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- W2532679655 endingPage "041008" @default.
- W2532679655 startingPage "041008" @default.
- W2532679655 abstract "Luminescent carbon nanodots (CND) are a recent addition to the family of carbon nanostructures. Interestingly, a large group of CNDs are fluorescent in the visible spectrum and possess single dipole emitters with potential applications in super-resolution microscopy, quantum information science, and optoelectronics. There is a large diversity of CND's size as well as a strong variability of edge topology and functional groups in real samples. This hampers a direct comparison of experimental and theoretical findings that is necessary to understand the unusual photophysics of these systems. Here, we derive atomistic models of finite sized (<2.5 nm) CNDs from high resolution transmission electron microscopy (HRTEM) which are studied using approximate time-dependent density functional theory. The atomistic models are found to be primarily two-dimensional (2D) and can hence be categorised as graphene quantum dots (GQD). The GQD model structures that are presented here show excitation energies in the visible spectrum matching previous single GQD level photoluminescence studies. We also present the effect of edge hydroxyl and carboxyl functional groups on the absorption spectrum. Overall, the study reveals the atomistic origin of CNDs photoluminescence in the visible range." @default.
- W2532679655 created "2016-10-28" @default.
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- W2532679655 date "2016-10-18" @default.
- W2532679655 modified "2023-10-06" @default.
- W2532679655 title "Graphene quantum dots with visible light absorption of the carbon core: insights from single-particle spectroscopy and first principles based theory" @default.
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- W2532679655 doi "https://doi.org/10.1088/2053-1583/3/4/041008" @default.
- W2532679655 hasPublicationYear "2016" @default.
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