title: Synthesis and characterization of NiSn dendrimer-encapsulated nanoparticles.
abstract: We report the synthesis and characterization of NiSn dendrimer-encapsulated nanoparticles (DENs) with sizes in the range of approximately 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 Ni(2+) and Sn(2+) 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.
authors.affiliation: Department of Chemistry and Biochemistry and the Center for Electrochemistry, The University of Texas at Austin, 1 University Station A5300, Austin, Texas 78712-0165, USA.
authors.forename: Arther T
authors.initials: AT
authors.lastname: Gates
authors.forename: Elizabeth G
authors.initials: EG
authors.lastname: Nettleton
authors.forename: V Sue
authors.initials: VS
authors.lastname: Myers
authors.forename: Richard M
authors.initials: RM
authors.lastname: Crooks