Assembly and self-organization of silver nanocrystal superlattices: ordered "soft spheres."

Article Abstract:

The structure of dodecanethiol-capped silver nanocrystal superlattices has been studied using Fourier transform infrared and nuclear magnetic resonance spectroscopies. Silver nanocrystals less than 100 angstroms in diameter were grown at room temperature by a two-phase arrested growth method. Dodecanethiol-capped nanocrystals were formed by evaporating the solvent from a dispersion on a substrate at room temperature. Results show the adsorbed alkane chains have a liquidlike composition. The ligand thiol headqroups are closely-packed with nearly 75% coverage of surface silver atoms.

Crystals, Crystal structure, Superlattices as materials, Superlattices

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Programming a gold nanocrystal to recognize and selectively bind a molecular substrate in solution

Article Abstract:

Gold nanocrystal particles have been prepared by stabilizing a chemisorbed mixture of a long-chain alkane thiol, dodecanethiol (95%), and a long-chain dodecanethiol with a receptor, 12-mercaptododecyl-1-uracil (5%). This approach allows the chemisorption of a stabilizer to be regulated, while the desired receptor or substrate can be incorporated at the surface of the nanocrystals of a stable dispersion. The nanocrystals recognize and selectively bind in solution a long-chain alkane with N,N'-2,6-pyridinediylbis(undecamide) as a complementary substrate.

Research, Thin films, Monomolecular films, Gold

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Noncovalent self-assembly of silver nanocrystal aggregates in solution

Article Abstract:

The nanocrystal aggregates formed as a result is studied by NMR, FT-IR and dynamic light scattering. The key findings are that aggregation of Ag- (I+II) in the presence of added III is reaction limited, while aggregation of Ag-II in the presence of added III exhibits diffusion-limited kinetics.

Primary nonferrous metals, not elsewhere classified, Primary Smelting and Refining of Nonferrous Metal (except Copper and Aluminum), Silver, Usage, Molecular crystals, Fourier transform infrared spectroscopy, Atomic properties

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