Open AccessHighly Fluorescent Nitrogen-Doped Graphene Quantum Dots’ Synthesis and Their Applications as Fe(III) Ions Sensor
Author(s) -
Fei Lu,
YiHua Zhou,
Lingling Wu,
Jun Qian,
Sheng Cao,
Yafeng Deng,
Yuan Chen
Publication year - 2019
Publication title -
international journal of optics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.263
H-Index - 17
eISSN - 1687-9392
pISSN - 1687-9384
DOI - 10.1155/2019/8724320
Subject(s) - quantum yield , graphene , fluorescence , ethylenediamine , metal ions in aqueous solution , materials science , detection limit , quantum dot , photochemistry , ion , carbon fibers , inorganic chemistry , selectivity , metal , chemistry , nanotechnology , composite number , organic chemistry , catalysis , optics , chromatography , metallurgy , composite material , physics
Nitrogen-doped graphene quantum dots (N-GQDs) with strong blue fluorescence and a high quantum yield of 88.9% were synthesized via a facile one-pot hydrothermal treatment with citric acid (CA) and ethylenediamine (EDA) as carbon and nitrogen sources, respectively. The blue fluorescence emission is independent of the excitation wavelengths. These N-GQDs dispersed well in water and ethyl alcohol and showed a highly selective and sensitive detection of hazardous and toxic Fe 3+ in the range of 1600 μ mol/L to 6000 μ mol/L through a fluorescence quenching process with a detection limit of 2.37 μ mol/L. Based on the excellent sensitivity and selectivity of N-GQDs to heavy metal ions, paper-based sensors can be fabricated by inkjet printing, which are rapid but low cost. So the visual instant on-site identification of heavy metal ion will be realized in the future.