Nitrogen and sulfur co-doped carbon quantum dots as fluorescence sensor for detection of lead ion

Autor:	Nengqin Jia, Huali Shi, Chaohui Zhou, Qi Zhao
Rok vydání:	2022
Předmět:	Detection limit Wavelength chemistry Band gap Doping Analytical chemistry chemistry.chemical_element Fluorescence Nitrogen Sulfur Analytical Chemistry Ion
Zdroj:	Chinese Journal of Analytical Chemistry. 50:63-68
ISSN:	1872-2040
DOI:	10.1016/j.cjac.2021.09.010
Popis:	A fluorescent carbon quantum dots(N-S CQDs) doped with nitrogen, and sulfur with tunable wavelength was successfully prepared by one-step hydrothermal reaction for sensitive detection of Pb2+. The doping of N and S narrows the band gap of the CQDs and makes the wavelength red shift, so that the carbon quantum dots displayed maximum emission peak at 540 nm under 460 nm excitation. The addition of Pb2+ quenched the fluorescence due to the specific combination of Pb2+ with the carboxyl and sulfhydryl on the surface of the CQDs formed a coordination structure. Under optimal conditions, the carbon quantum dots revealed outstanding anti-interference capability and a favorable linear relation was obtained in the scope of 0.2-12 μM and 40-200 μM with the limit of detection of 0.097 μM and 5.624 μM for Pb2+. Besides, the CQDs had been successfully used for monitoring Pb2+ in river water with well accuracy and recovery.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::e7f5a4e645ef5cd74ec69ab2defe9d46 https://doi.org/10.1016/j.cjac.2021.09.010 Zobrazit plný text záznamu Full Text from ScienceDirect