Thermal, Magnetic, and Luminescent Properties of Dendronized Ferrite Nanoparticles
详细信息 查看全文
- 作者：Sawan Buathong ; Diane Ung ; T. Jean Daou ; Corinne Ulhaq-Bouillet ; Genevieve Pourroy ; Daniel Guillon ; Lyubomira Ivanova ; Ingolf Bernhardt ; Sylvie Bgin-Colin ; Bertrand Donnio
- 刊名：Journal of Physical Chemistry C
- 出版年：2009
- 出版时间：July 16, 2009
- 年：2009
- 卷：113
- 期：28
- 页码：12201-12212
- 全文大小：485K
- 年卷期：v.113,no.28(July 16, 2009)
- ISSN：1932-7455
文摘
The design, synthesis, and some properties of magnetic nanocrystals of ferrite functionalized by luminescent prodendritic ligands are described. Multipotent hybrids resulting from the coupling of an inorganic nanocore (metallic, alloy, or oxide nanoparticle) embedded in an organic shell currently elicit sustained research activity in various areas of materials science and notably in the development of numerous, potential applications, for example, as relevant building blocks for self-assembled arrays of nanoparticles with magneto-luminescence properties, as magnetically movable luminescent probes, or as platforms for biomedical applications. In this study, we have essentially focused on the covalent functionalization of γ-Fe2O3 magnetic nanoparticles, with an average diameter of 40 nm by engineered luminescent, liquid-crystalline oligo(phenylene vinylene)-based prodendritic ligands. The grafting rate of the various ligands on the oxide surface and the thermal stability and behavior of the hybrids have been studied in detail and are reported here. The dendronized nanoparticles exhibit room temperature ferrimagnetic behavior, as do the parent naked particle. Furthermore, the grafting of covalent organic chromophores confers to the ensemble luminescent properties that can be tuned by the structure of the luminophore. However, despite the liquid crystalline character of the luminescent ligands, none of the corresponding hybrids showed mesomorphic properties, a result attributed to the large size discrepancy between the nanocrystalline core and the ligand.