Jul 22, 2010

Formation mechanism of silver nanoparticle 1D microstructures and their hierarchical assembly into 3D superstructures

Nanoscale
Lorenza Suber, William R Plunkett

Abstract

Flower-like silver nanoparticle superstructures are prepared by the reaction of silver nitrate and ascorbic acid in an acidic aqueous solution of a polynaphthalene system. The three-dimensional flower-like structure has a purely hierarchic arrangement, wherein each petal is composed of bundles of silver particle chains, each enclosed in a polymer sheath. The ordering arises from strong adsorption of silver ions onto the polymer and by the interplay of the redox properties of nitric and ascorbic acid. As a result, linear silver cyanide, formed on the polymer, probably due to intrinsic electric dipole fields, organizes the silver particle chains in dumbbell-like structures, resembling buds and flower-like structures. By dilution and heating of the mother liquors, it is also possible to obtain single petals, i.e. micrometer sized bundles of linearly aggregated silver nanoparticle chains, each enclosed in a polymer sheath.The comprehension of the hierarchic assembly of silver nanoparticles, paves the way to a facile general method to prepare polymer-metal nanoparticle chains and flower-like superstructures.The results of this study improve both the understanding of the formation mechanism of hierarchic structures at mild temperatur...Continue Reading

  • References19
  • Citations5

Mentioned in this Paper

Aggregation
Argentum nitricum, silver nitrate
Bud - CHV Concept
Adsorption
Spectroscopy, Fourier Transform Infrared
Ascorbic Acid Measurement
Foreskin of Penis
Polymers
Petal
Metal Nanoparticles

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