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Nanomaterials 2019, 9(2), 189; https://doi.org/10.3390/nano9020189

Synthesis and Luminescence Properties of Core-Shell-Shell Composites: SiO2@[email protected]2 and SiO2@[email protected]2

1
Inner Mongolia Key Laboratory of Chemistry and Physics of Rare Earth Materials, School of Chemistry and Chemical Engineering, Inner Mongolia University, Hohhot 010021, China
2
Inner Mongolia Autonomous Region Food Inspection Test Center, Hohhot 010010, China
*
Author to whom correspondence should be addressed.
Received: 2 January 2019 / Revised: 21 January 2019 / Accepted: 30 January 2019 / Published: 2 February 2019
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Abstract

Two novel core-shell composites SiO2@PMDA-Si-Tb, SiO2@PMDA-Si-Tb-phen with SiO2 as the core and terbium organic complex as the shell, were successfully synthesized. The terbium ion was coordinated with organic ligand forming terbium organic complex in the shell layer. The bi-functional organosilane ((HOOC)2C6H2(CONH(CH2)3Si(OCH2CH3)3)2 (abbreviated as PMDA-Si) was used as the first ligand and phen as the second ligand. Furthermore, the silica-modified SiO2@[email protected]2 and SiO2@[email protected]2 core-shell-shell composites were also synthesized by sol-gel chemical route. An amorphous silica shell was coated around the SiO2@PMDA-Si-Tb and SiO2@PMDA-Si-Tb-phen core-shell composites. The core-shell and core-shell-shell composites both exhibited excellent luminescence in solid state. The luminescence of core-shell-shell composites was stronger than that of core-shell composites. Meanwhile, an improved luminescence stability property for the core-shell-shell composites was found in the aqueous solution. The core-shell-shell composites exhibited bright luminescence, high stability, long lifetime, and good solubility, which may present potential applications in the bio-medical field. View Full-Text
Keywords: 2,5-bis((3-(triethoxysilyl)propyl)carbamoyl)terephthalic acid (PMDA-Si); core-shell composite; core-shel-shell composite; silica shell; photoluminescence; lifetime 2,5-bis((3-(triethoxysilyl)propyl)carbamoyl)terephthalic acid (PMDA-Si); core-shell composite; core-shel-shell composite; silica shell; photoluminescence; lifetime
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).

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Feng, L.; Li, W.; Bao, J.; Zheng, Y.; Li, Y.; Ma, Y.; Yang, K.; Qiao, Y.; Wu, A. Synthesis and Luminescence Properties of Core-Shell-Shell Composites: SiO2@[email protected]2 and SiO2@[email protected]2. Nanomaterials 2019, 9, 189.

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