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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
materials science
Graphene quantum dots as fluorescence probes for turn-off sensing of melamine in the presence of Hg
2+
ACS Applied Materials and Interfaces, Volume 6, No. 4, Year 2014
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Description
A rapid and sensitive fluorescence sensing system for melamine based on charge transfer quenching of the fluorescence of graphene quantum dots (GQDs) in the presence of Hg2+ is proposed. The synthesized GQDs were strongly luminescent with predominantly aromatic sp2 domains. Melamine could coordinate with mercury through nitrogen atoms in both its amine and triazine groups and bring more Hg2+ to the surface of GQDs through π-π stacking, thus leading to quenching of the GQDs' fluorescence. The quenching mechanism was investigated in detail and ascribed to charge transfer from the GQDs to Hg2+ with melamine acting as the linkage agent. The melamine demonstrated a linear range 0.15-20 μM and a detection limit of 0.12 μM, which was far below the regulatory level, suggesting the promising practical usage of this sensing system. This sensing system also possessed high selectivity for melamine in the presence of possible interferences. Finally, this novel sensor was successfully applied for melamine detection in raw milk and satisfactory recovery was achieved. © 2014 American Chemical Society.
Authors & Co-Authors
Li, Lingling
China, Nanjing
Nanjing University
Wu, Gehui
China, Nanjing
Nanjing University
Hong, Tao
China, Nanjing
Nanjing University
Yin, Zhouyang
China, Nanjing
Nanjing University
Sun, Dong
China, Nanjing
Nanjing University
Abdel-Halim, Essam Sayed
Saudi Arabia, Riyadh
College of Sciences
Zhu, Junjie
China, Nanjing
Nanjing University
Statistics
Citations: 113
Authors: 7
Affiliations: 2
Identifiers
Doi:
10.1021/am405305r
ISSN:
19448244
e-ISSN:
19448252