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Selenium‐Doped Carbon Quantum Dots for Free‐Radical Scavenging
Author(s) -
Li Feng,
Li Tianyu,
Sun Chenxing,
Xia Jiahao,
Jiao Yang,
Xu Huaping
Publication year - 2017
Publication title -
angewandte chemie international edition
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.831
H-Index - 550
eISSN - 1521-3773
pISSN - 1433-7851
DOI - 10.1002/anie.201705989
Subject(s) - electronegativity , selenium , heteroatom , quantum dot , chemistry , carbon fibers , carbon quantum dots , radical , quantum yield , fluorescence , redox , photochemistry , doping , reactive oxygen species , nanotechnology , materials science , inorganic chemistry , organic chemistry , biochemistry , composite number , composite material , optoelectronics , quantum mechanics , ring (chemistry) , physics
Heteroatom doping is an effective way to adjust the fluorescent properties of carbon quantum dots. However, selenium‐doped carbon dots have rarely been reported, even though selenium has unique chemical properties such as redox‐responsive properties owing to its special electronegativity. Herein, a facile and high‐output strategy to fabricate selenium‐doped carbon quantum dots (Se‐CQDs) with green fluorescence (quantum yield 7.6 %) is developed through the hydrothermal treatment of selenocystine under mild conditions. Selenium heteroatoms endow the Se‐CQDs with redox‐dependent reversible fluorescence. Furthermore, free radicals such as . OH can be effectively scavenged by the Se‐CQDs. Once Se‐CQDs are internalized into cells, harmful high levels of reactive oxygen species (ROS) in the cells are decreased. This property makes the Se‐CQDs capable of protecting biosystems from oxidative stress.