Fluorescent carbon nanomaterials: “quantum dots” or nanoclusters?

Literature Information

Publication Date 2014-06-26
DOI 10.1039/C4CP00138A
Impact Factor 3.676
Authors

Mariia O. Dekaliuk, Oleg Viagin, Yuriy V. Malyukin, Alexander P. Demchenko


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Abstract

Despite many efforts, the mechanisms of light absorption and emission of small fluorescent carbon nanoparticles (C-dots) are still unresolved and are a subject of active discussion. In this work we address the question as to whether the fluorescence is a collective property of these nanoparticles or they are composed of assembled individual emitters. Selecting three types of C-dots with “violet”, “blue” and “green” emissions and performing a detailed study of fluorescence intensity, lifetime and time-resolved anisotropy as a function of excitation and emission wavelengths together with the effect of viscogen and dynamic fluorescence quencher, we demonstrate that the C-dots represent assemblies of surface-exposed fluorophores. They behave as individual emitters, display electronic anisotropy, do not exchange their excited-state energies via homo-FRET and possibly display sub-nanosecond intra-particle mobility.

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Back cover

Cover

DOI: 10.1039/C8CP90074D

Contents list

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Physical Chemistry Chemical Physics

Physical Chemistry Chemical Physics
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