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... 22-27 Our data (Figure 1) show a shift of the peak that depends on the ratio of metal salts. This suggests that, as the ratio of Au/Ag increases, Au co-reduces with Ag to form silver−gold alloy nanoparticles. figure ... 4) Valden, M.; Lai, X.; Goodman, DW Science 1998, 281, 1647. ...

One-phase synthesis of gold and platinum nanoparticles using new thiol-functionalized ionic liquids (TFILs) is described for the first time. TFILs as stabilizing agents for gold and platinum nanoparticles were designed to have thiol groups on either the cation or anion and symmetrical or unsymmetrical positions only in the cation. Transmission electron microscopy, electron diffraction, and NMR were used for the characterization of nanoparticles. The metal nanoparticles formed using TFILs are crystalline structures with face-centered cubic packing arrangements and have small sizes (the average diameters are 3.5, 3.1, and 2.0 nm for Au and 3.2, 2.2, and 2.0 nm for Pt, respectively) and uniform distributions (the standard deviations are 0.7, 0.5, and 0.1 nm for Au and 1.1, 0.2, and 0.1 for Pt, respectively). It is believed that the nanoparticle size and distribution depend on the number and position of thiol groups in the IL.

Phosphine-stabilized gold nanoparticles, originally formulated as Au 55 (PPh 3) 12 Cl 6 by Schmid et al. 1 in 1981, have been widely investigated as models for metallic catalysts 2 and as building blocks for nanoscale electronic devices. 3, 4 Although the original formulation ...

Water-soluble, Au-coated magnetic Fe oxide nanoparticles with diameters~ 60 nm were synthesized by the reduction of Au3+ onto the surfaces of~ 9 nm diameter particles consisting of either γ-Fe2O3 or partially oxidized Fe3O4 via iterative hydroxylamine ...

... Richard M. Crooks, Victor Chechik, Buford I. Lemon III, Li Sun, Lee K. Yeung, and Mingqi Zhao 12 The Electrochemistry of Monolayer Protected Au Clusters 297 David E. Cliffel, Jocelyn F. Hicks ... North Carolina Ser-Sing Chang National Chung Cheng University, Min-Hsiung. ...

In the present Communication, a completely "green" synthetic method for producing silver nanoparticles is introduced. The process is simple, environmentally benign, and quite efficient. By gentle heating of an aqueous starch solution containing silver nitrate and glucose, we produce relatively monodisperse, starched silver nanoparticles. beta-d-Glucose serves as the green reducing agent, while starch serves as the stabilization agent.

A seed-mediated growth method was used to control the morphology and dimensions of Au nanocrystals by the manipulation of the experimental parameters in aqueous solution at room temperature. This chemical route produces various structural architectures with rod-, rectangle-, hexagon-, cube-, triangle-, and starlike profiles and branched (such as bi-, tri-, tetra-, and multipod) Au nanocrystals of various dimensions in high yield in the presence of a single surfactant, cetyltrimethylammonium bromide.

This Account reports the synthesis and characterization of dendrimer-encapsulated metal nanoparticles and their applications to catalysis. These materials are prepared by sequestering metal ions within dendrimers followed by chemical reduction to yield the corresponding zerovalent metal nanoparticle. The size of such particles depends on the number of metal ions initially loaded into the dendrimer. Intradendrimer hydrogenation and carbon-carbon coupling reactions in water, organic solvents, biphasic fluorous/organic solvents, and supercritical CO2 are also described.