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Fluorescence enhancement of Tb$^{3+}$ complexes by adding silica-coated silver nanoparticles

Content Provider	Springer Nature Link
Author	Zhou, Dan Lin, Xuemei Wang, Ailing Li, Jingjing Qu, Yanrong Chu, Haibin Zhao, Yongliang
Copyright Year	2015
Abstract	Six kinds of terbium ternary complexes with halo-benzoic acids were synthesized. Their compositions were determined by C, H elemental analyzer and EDTA titration. The infrared spectra, ultraviolet absorption spectra, and fluorescence spectra were also measured to identify the complexes. Elemental analysis showed that the compositions of these complexes were Tb(p-BrBA)$_{3}$·H$_{2}$O, Tb(p-ClBA)$_{3}$·2H$_{2}$O, Tb(p-FBA)$_{3}$·H$_{2}$O, Tb(o-FBA)$_{3}$·2H$_{2}$O, Tb(o-ClBA)$_{3}$·H$_{2}$O, and Tb(o-BrBA)$_{3}$·H$_{2}$O, respectively. The monodispersed Ag@SiO$_{2}$ core-shell nanoparticles with silica thicknesses of 10, 15, and 25 nm were successfully prepared and characterized by transmission-electron microscopy. Fluorescence intensities of the complexes were detected before and after Ag@SiO$_{2}$ core-shell nanoparticles were added; the enhancement times were related to the silica-shell thickness. The fluorescence enhancement times were largest when the thickness of the silica shell was 25 nm. The mechanism may be attributed to the localized surface-plasmon resonance. Furthermore, the enhancement effect of terbium fluoro-benzoate complexes was the strongest in these complexes. This result may be attributed to the hydrogen bond between the hydroxyl on the surface of the silica shell and the fluorine atom.
Starting Page	979
Ending Page	985
Page Count	7
File Format	PDF
ISSN	16747291
Journal	Science in China Series B: Chemistry
Volume Number	58
Issue Number	6
e-ISSN	18691870
Language	English
Publisher	Science China Press
Publisher Date	2015-01-08
Publisher Place	Beijing
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Tb$^{3+}$ complexes halobenzoic acids Ag@SiO$_{2}$ core-shell nanoparticles metal-enhanced fluorescence Chemistry/Food Science
Content Type	Text
Resource Type	Article
Subject	Chemistry

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