Simona E Hunyadi | PubMed Health

PubMed2006

One-dimensional colloidal gold and silver nanostructures.

One-dimensional (1-D) metallic nanoscale materials have long been of interest to many groups of scientists. Within the last 2 decades, great advances in the synthesis of metallic nanorods and nanowires have been made, with a variety of templating methods. More recently, bottom-up chemical syntheses of these materials have become increasingly reported in the literature. This Forum Article describes the synthesis, physical properties, and potential applications of 1-D metals, with an emphasis on silver and gold derived from studies in the authors' laboratories.

Journal Article↗

PubMed2006

Tunable one-dimensional silver-silica nanopeapod architectures.

Silica-coated silver nanowires can be chemically treated to produce a "peapod" architecture in which silver peas are embedded in silica pods. The silver "pea" dimension and interparticle spacings are controllable down to approximately 50 nm. This architecture is potentially useful for chemical sensing, plasmonic, or catalytic applications.

Journal Article↗

PubMed2005

Anisotropic metal nanoparticles: Synthesis, assembly, and optical applications.

This feature article highlights work from the authors' laboratories on the synthesis, assembly, reactivity, and optical applications of metallic nanoparticles of nonspherical shape, especially nanorods. The synthesis is a seed-mediated growth procedure, in which metal salts are reduced initially with a strong reducing agent, in water, to produce approximately 4 nm seed particles. Subsequent reduction of more metal salt with a weak reducing agent, in the presence of structure-directing additives, leads to the controlled formation of nanorods of specified aspect ratio and can also yield other shapes of nanoparticles (stars, tetrapods, blocks, cubes, etc.). Variations in reaction conditions and crystallographic analysis of gold nanorods have led to insight into the growth mechanism of these materials. Assembly of nanorods can be driven by simple evaporation from solution or by rational design with molecular-scale connectors. Short nanorods appear to be more chemically reactive than long nanorods. Finally, optical applications in sensing and imaging, which take advantage of the visible light absorption and scattering properties of the nanorods, are discussed.

Anisotropy↗