Synthesis of tubular gold and silver nanoshells using silica nanowire core templates.

We report the synthesis of tubular gold and silver nanoshells on silica nanowire core templates in solution. Silica nanowires were synthesized and characterized with optical and NMR methods. Gold nanoparticle seeds (2 to 3 nm) with weak repulsive surfactants such as tetrakis-hydroxymethyl-phosphonium chloride (THPC) were conjugated to the surface of these nanowires.

Crystal structures, Raman spectroscopy, and magnetic properties of Ba7.5Al13Si29 and Eu0.27Ba7.22Al13Si29.

The framework-deficient clathrate phases Ba7.5Al13Si29 and Eu0.27Ba7.

Alkanethiol-induced structural rearrangements in silica-gold core-shell-type nanoparticle clusters: an opportunity for chemical sensor engineering.

Electrostatically bonded SiO2.Au nanoparticle clusters form by reaction of 3-aminopropylsilane-modified SiO2 spheres (470 nm) with citrate-coated gold nanoparticles (9.7 nm) in water.

Silicon-based nanowires from silicon wafers catalyzed by cobalt nanoparticles in a hydrogen environment.

We present here the synthesis of silicon-based nanowires directly from silicon wafers at high temperatures and in the presence of cobalt nanoparticles and hydrogen gas. All three ingredients were critical to the growth of Si-based nanowires, which were between 5-60 nm in diameter and microm-mm long. Both heavily coiled and straight Si-based nanowires were made.