期刊
TALANTA
卷 191, 期 -, 页码 74-80出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.talanta.2018.08.041
关键词
SiO2@Tb/GMP core-shell nanostructures; Luminescence sensor; Superoxide anion; Nanoscale coordination polymers
资金
- National Natural Science Foundation of China [21465015, 21665012]
- Ground Plan of Science and Technology Projects of Jiangxi Educational Committee [KJLD14023]
- Key Laboratory of Functional Small Organic Molecule, Ministry of Education, Jiangxi Normal University [KLFS-KF-201708, KLFS-KF-201713]
It is of great significance for superoxide anion (O-2(center dot-)) detection due to its important role in regulation of biological function. The nanoscale coordination polymers (NCPs) core -shell nanostructures have attracted increasing interests for their nanosized-dependent properties. In this study, SiO2@Tb/guanosine 5'-monophosphate (GMP) NCPs with core-shell nanostructures was designed for O-2(center dot-) detection. The SiO2@Tb/GMP NCPs core-shell nanostructures were produced by using SiO2 nanoparticles (NPs) as template to control their nano size. First, Tb3+ was adsorbed on the surface of SiO(2)NPs by coordination with -COOH of SiO(2)NPs. Then the Tb/GMP NCPs shells were grown along the surface of SiO(2)NPs. The SiO2@Tb/GMP NCPs core-shell nanostructures were characterized with scanning electron microscopy, transmission electron microscopy, Fourier transform infrared spectroscopy and Zeta potential. The resulted SiO2@Tb/GMP NCPs core-shell nanostructures displayed strong Tb/GMP emission which decreased linearly with the increased O-2(center dot-) concentration in the range from 5.3 nM to 6.0 sM with a limit detection of 2.18 nM. And the SiO2@Tb/GMP NCPs core-shell nanostructures also exhibited good selectivity and high sensitivity in HEPES buffer at pH 7.4.
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