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Journal of Materials Science
Published in: Journal of Materials Science 7/2019

10-12-2018 | Chemical routes to materials

Ultra-small amorphous carbon dots: preparation, photoluminescence properties, and their application as TiO2 photosensitizers

Authors: Peng Wu, Xueyun Wu, Wei Li, Yushan Liu, Zhijun Chen, Shouxin Liu

Published in: Journal of Materials Science | Issue 7/2019

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Abstract

Ultra-small carbon quantum dots (s-CQDs) with excitation wavelength-independent fluorescence had been obtained by hydrothermal-followed acid precipitation method and were characterized by FT-IR, TEM, XPS, UV–Vis and XRD. It was found that as-prepared s-CQDs were amorphous spherical particles with an average diameter of 1.51 nm, and there were abundant hydroxyl and carbonyl groups on their surfaces. Moreover, fluorescence emission study found that the luminescence of s-CQDs was aroused by oxygen group decorated on its surface, and the fluorescence properties of s-CQDs were much different from those of large CQDs (l-CQDs), which showed higher quantum yield and better photoluminescence (PL) property than that of l-CQDs. The PL of s-CQDs possessed two emission centers and was exhibited to be excitation independent. When s-CQDs was used as photosensitizer for TiO2 to photocatalytic degradation of methylene blue under visible light irradiation, it showed significantly improved photocatalytic activities compared with 1-CQDs, and the degradation efficiency of methylene blue reached up to 96.6%. The high degradation efficiency was attributed to the ultra-small particle size, abundant acidic groups, and excellent optical properties of s-CQDs.
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Metadata
Title
Ultra-small amorphous carbon dots: preparation, photoluminescence properties, and their application as TiO2 photosensitizers
Authors
Peng Wu
Xueyun Wu
Wei Li
Yushan Liu
Zhijun Chen
Shouxin Liu
Publication date
10-12-2018
Publisher
Springer US
Published in
Journal of Materials Science / Issue 7/2019
Print ISSN: 0022-2461
Electronic ISSN: 1573-4803
DOI
https://doi.org/10.1007/s10853-018-3135-1

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