Synthesis and Characterization of NiSn Dendrimer-Encapsulated Nanoparticles

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• 作者：Arther T. Gates ; Elizabeth G. Nettleton ; V. Sue Myers ; Richard M. Crooks
• 刊名：Langmuir
• 出版年：2010
• 出版时间：August 3, 2010
• 年：2010
• 卷：26
• 期：15
• 页码：12994-12999
• 全文大小：913K
• 年卷期：v.26,no.15(August 3, 2010)
• ISSN：1520-5827

文摘

We report the synthesis and characterization of NiSn dendrimer-encapsulated nanoparticles (DENs) with sizes in the range of 1.2 nm. These types of materials have potential applications in energy storage, and particles in the 1−3 nm size range are particularly attractive for this use. The NiSn DENs described here contain an average of 147 atoms and are encapsulated within hydrophobic, sixth-generation poly(amidoamine) dendrimers. DENs prepared using four different Ni/Sn ratios, along with monometallic Ni and Sn DENs, are described. To prevent oxidation, the synthesis was carried out under dry conditions in toluene. These bimetallic DENs were characterized by UV−vis spectroscopy, transmission electron microscopy, energy-dispersive X-ray spectroscopy, and X-ray photoelectron spectroscopy. The results indicate that the compositions of the nanoparticles reflect the ratio of Ni²⁺ and Sn²⁺ used in the first step of the synthesis; the NiSn nanoparticles remain encapsulated within the dendrimers, and when dry they have a degree of stability even after a short exposure to air.