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Issue 15, 2014
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One-step preparation of nitrogen-doped and surface-passivated carbon quantum dots with high quantum yield and excellent optical properties

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Abstract

Nitrogen-doped carbon quantum dots (N-CQDs) are prepared via one-step hydrothermal processing using citric acid and linear-structured polyethyleneimine (LPEI) polymer as raw materials. The LPEI serves not only as a nitrogen source for N-doping but also as a surface-passivation agent for surface modification. The as-obtained N-CQDs show a mean size of 1.67 nm and a high fluorescence quantum yield (QY) of 37.4%. In addition, with the remaining LPEI on the surface, the N-CQDs also show good water-solubility and reducibility for noble metal ions to construct CQDs-containing composites. After a set of careful examinations of the as-obtained N-CQDs, the so-called up-conversion photoluminescence (UCPL) of CQDs under an excitation of a xenon lamp, which are observed in previous reports, is found to be a false appearance caused by the second-order diffraction light from the monochromators of the spectrofluorimeter.

Graphical abstract: One-step preparation of nitrogen-doped and surface-passivated carbon quantum dots with high quantum yield and excellent optical properties

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Supplementary files

Article information


Submitted
12 Dec 2013
Accepted
08 Jan 2014
First published
10 Jan 2014

RSC Adv., 2014,4, 7648-7654
Article type
Paper

One-step preparation of nitrogen-doped and surface-passivated carbon quantum dots with high quantum yield and excellent optical properties

J. Liu, X. Liu, H. Luo and Y. Gao, RSC Adv., 2014, 4, 7648
DOI: 10.1039/C3RA47577H

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