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Study and Comparison on Purification Methods of Multicolor Emission Carbon Dots
Author(s) -
Zhou Shengju,
Sui Ying,
Zhu Xiaotong,
Sun Xiaofeng,
Zhuo Shuping,
Li Hongguang
Publication year - 2021
Publication title -
chemistry – an asian journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.18
H-Index - 106
eISSN - 1861-471X
pISSN - 1861-4728
DOI - 10.1002/asia.202001352
Subject(s) - formamide , luminescence , biocompatibility , gel permeation chromatography , photoluminescence , carbon fibers , pyrolysis , materials science , precipitation , nanotechnology , permeation , chemistry , chemical engineering , polymer , organic chemistry , optoelectronics , biochemistry , physics , membrane , composite number , meteorology , engineering , composite material
Recent years have witnessed a rapid development of carbon dots (CDs), due to their outstanding luminescence properties and excellent biocompatibility. However, the internal structure and photoluminescent (PL) mechanism of CDs are still the subject of considerable debate, which is due to the fact that reaction products usually contain mixtures of several CD fractions as well as molecular intermediate and side products. Therefore, careful purification of the CDs is significant for analysis of structure and luminescence mechanism. Here, multicolor emission CDs were prepared by a one‐pot pyrolysis of citric acid in formamide. Then, the precipitation method, dialysis and gel permeation chromatography (GPC) are successively employed to purify the multicolor emission CDs. This post‐treatment allowed us to compare the optical properties of CDs obtained by different separation methods and provide a valuable guidance for the purification of CDs.