Reduced Carbon Dots versus Oxidized Carbon Dots: Photo- and Electrochemiluminescence Investigations for Selected Applications

The study of the composition, morphology, and surface structure of carbon dots (Cdots) is critical to understanding their effect on the photo‐ and electrochemiluminescence (PL and ECL) of Cdots in selected applications. Herein, two kinds of Cdots were prepared with 3‐(3,4‐dihydroxyphenyl)‐L‐alanine...

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Bibliographic Details
Published in:Chemistry : a European journal 2013-05, Vol.19 (20), p.6282-6288
Main Authors: Xu, Yang, Wu, Ming, Feng, Xi-Zeng, Yin, Xue-Bo, He, Xi-Wen, Zhang, Yu-Kui
Format: Article
Language:English
Subjects:
Carbon
Carbon - chemistry
carbon dots
Chemistry
Copper - analysis
Electrochemiluminescence
Emission
HeLa Cells
Humans
Imaging
Levodopa - chemistry
Nanoparticles
Office automation
Oxidation
Oxidation-Reduction
Oxygen - chemistry
photoluminescence
Quenching
sensors
Strategy
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Summary:The study of the composition, morphology, and surface structure of carbon dots (Cdots) is critical to understanding their effect on the photo‐ and electrochemiluminescence (PL and ECL) of Cdots in selected applications. Herein, two kinds of Cdots were prepared with 3‐(3,4‐dihydroxyphenyl)‐L‐alanine (L‐DOPA) as precursor. The Cdots prepared by using a carbonization‐extraction strategy have a low oxidation level and are denoted as reduced Cdots (r‐Cdots). The Cdots obtained with a carbonization‐oxidation process are highly oxidized and are denoted as oxidized Cdots (o‐Cdots). The o‐Cdots have a carbon core and oxygen‐containing loose shell, but the r‐Cdots consist mainly of the carbon core. Whereas r‐Cdots have a strong blue PL but no apparent ECL response, o‐Cdots exhibit a relatively weak PL and strong ECL emission. These properties allow for selected applications of the Cdots. The r‐Cdots were used in cell imaging with their high PL emission. The o‐Cdots, with their high ECL efficiencies, were selected to sense Cu2+ with Cu2+‐inducing ECL quenching in the o‐Cdots/K2S2O8 system. This work provides the possibility to control the composition of Cdots for selected applications and shows a good way to characterize surface traps of Cdots because ECL is characterized by the surface‐state and PL is mainly related to the core‐state in Cdots. Joining the Cdots: Two kinds of carbon dots (Cdots), with different oxidation levels, were successfully prepared through a carbogenic and then extraction or oxidation process. Their photoluminescence (PL) and electrochemiluminescence (ECL) properties were carefully studied for selected applications in cell imaging and metal‐ion detection (see figure; CB=conduction band, VB=valence band).
ISSN:0947-6539
1521-3765
DOI:10.1002/chem.201204372