Preprint Article Version 1 Preserved in Portico This version is not peer-reviewed

Synthesis and Luminescence Properties of Core-Shell-Shell Composites: SiO2@PMDA-Si-Tb@SiO2 and SiO2@PMDA-Si-Tb-phen@SiO2

Version 1 : Received: 21 January 2019 / Approved: 22 January 2019 / Online: 22 January 2019 (12:01:07 CET)

A peer-reviewed article of this Preprint also exists.

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@PMDA-Si-Tb@SiO2 and SiO2@PMDA-Si-Tb-phen@SiO2. Nanomaterials 2019, 9, 189. 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@PMDA-Si-Tb@SiO2 and SiO2@PMDA-Si-Tb-phen@SiO2. Nanomaterials 2019, 9, 189.

Journal reference: Nanomaterials 2019, 9, 189
DOI: 10.3390/nano9020189

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@PMDA-Si-Tb@SiO2, SiO2@PMDA-Si-Tb-phen@SiO2 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 field of bio-medical.

Keywords

2,5-bis((3-(triethoxysilyl)propyl)carbamoyl)terephthalic acid (PMDA-Si), core-shell composite; core-shel-shell composite; silica shell; photoluminescence; lifetime

Subject

MATERIALS SCIENCE, Surfaces, Coatings & Films

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