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Rare Metals
Published in: Rare Metals 6/2021

10-01-2021 | Original Article

Fluorescent graphene oxide derived from carbonized citric acid for copper(II) ions detection

Authors: Wen-Dan Li, Xiang-Yu Zeng, Gang-Yu Lv, Zhen-Hui Liang, Qi-Jie Liu, Wan-Qi Fu, Jiu-An Zhang, Yan-Xian Feng, Hao-Yi Wu

Published in: Rare Metals | Issue 6/2021

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Abstract

Fluorescent graphene oxide (GO) nanoparticles were obtained from the thermal carbonization of citrate acid. Depending on the synthesizing temperature, the size of GO varied from several to several hundred nanometers. Owing to the confinement from the size, green and blue emissions at around 504 and 450 nm were observed from the GO suspension. These emissions could be dynamically quenched by titrating against copper (II) (Cu2+) ions, and the emission intensity was reduced exponentially as a function of Cu2+ concentration. The quenching mechanism was ascribed to the bridging of the surface –COOH and –OH groups by Cu2+, which restricted the vibration of edge atoms or clusters and reduced the number of luminophores of GO nanosheets. As a result, the concentration of Cu2+ was detectable with the fluorescent intensity of GO.
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Metadata
Title
Fluorescent graphene oxide derived from carbonized citric acid for copper(II) ions detection
Authors
Wen-Dan Li
Xiang-Yu Zeng
Gang-Yu Lv
Zhen-Hui Liang
Qi-Jie Liu
Wan-Qi Fu
Jiu-An Zhang
Yan-Xian Feng
Hao-Yi Wu
Publication date
10-01-2021
Publisher
Nonferrous Metals Society of China
Published in
Rare Metals / Issue 6/2021
Print ISSN: 1001-0521
Electronic ISSN: 1867-7185
DOI
https://doi.org/10.1007/s12598-020-01664-2

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