Nitrogen-doped carbon quantum dots for fluorescence detection of Cu²⁺ and electrochemical monitoring of bisphenol A.

ABSTRACT: In this work, water-soluble nitrogen-doped carbon quantum dots (N-CDs) were synthetized at low temperature via a simple hydrothermal strategy, using citric acid as the carbon source and polyethylenimine (PEI) as the nitrogen source. The as-prepared N-CDs with near spherical structure and sizes of 4.5-7.5 nm exhibited blue luminescence and a fluorescence quantum yield of 40.2%. Both X-ray photoelectron spectroscopy (XPS) and FTIR spectroscopy measurements demonstrated the presence of the primary and secondary amines on the surface of the N-CDs. The fluorescence of N-CDs could be effectively quenched by Cu²⁺ owing to the formation of a copper-amine complex between Cu²⁺ and the amino groups on the surface of the N-CDs. Since this behavior was quite pronounced the

SUBMITTER: Wu X 

PROVIDER: S-EPMC9080772 | biostudies-literature | 2018 May

REPOSITORIES: biostudies-literature