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One-Step Synthesis of Acidophilic Highly-Photoluminescent Carbon Dots Modified by Ionic Liquid from Polyethylene Glycol.


ABSTRACT: Acidophilic highly-photoluminescent ionic liquid (IL)-modified carbon dots (CDs) were fabricated directly from polyethylene glycol-2000 (PEG2000N) by a simple one-step hydrothermal method in a system containing an IL (1-butyl-3-methylimidazolium bromide [C4mim]Br) and hydrochloric acid (HCl). In this process, PEG2000N works as the carbon source, [C4mim]Br as the modifier, and HCl as the accelerator. CDs with low photoluminescence (PL) intensity and quantum yields (QYs) were generated in the system without H+, but CDs with high PL intensity and QYs could be prepared after H+ was introduced. Moreover, with the increase of H+ concentration, the QYs of the prepared CDs increase subsequently, and the highest QY reaches up to 43%. The formation mechanism was explored, and the results showed that H+ changes the surface groups of the CDs generated without H+ into those that exist on the CDs generated with H+, which further improves the PL performance of the CDs. Different from most CDs reported in the literature, the as-prepared CDs can still exhibit high PL intensity even under strong acidic condition.

SUBMITTER: Chen Y 

PROVIDER: S-EPMC6641901 | biostudies-literature | 2017 Aug

REPOSITORIES: biostudies-literature

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One-Step Synthesis of Acidophilic Highly-Photoluminescent Carbon Dots Modified by Ionic Liquid from Polyethylene Glycol.

Chen Yujuan Y   Yang Qian Q   Xu Panpan P   Sun Li L   Sun Dong D   Zhuo Kelei K  

ACS omega 20170831 8


Acidophilic highly-photoluminescent ionic liquid (IL)-modified carbon dots (CDs) were fabricated directly from polyethylene glycol-2000 (PEG<sub>2000N</sub>) by a simple one-step hydrothermal method in a system containing an IL (1-butyl-3-methylimidazolium bromide [C<sub>4</sub>mim]Br) and hydrochloric acid (HCl). In this process, PEG<sub>2000N</sub> works as the carbon source, [C<sub>4</sub>mim]Br as the modifier, and HCl as the accelerator. CDs with low photoluminescence (PL) intensity and qua  ...[more]

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