Fabrication of double nano-cup assemblies and their anomalous plasmon absorption

Synthesis and Optical Properties of Hybrid and Alloy Plasmonic Nanoparticles

“…232 Alternatively, hybrid nanoparticle semi-shells of concentric layers of Au, Al and Au have been prepared by physical vapor deposition onto a nanosphere template, and dissolution of the Al in an alkali produces a 'nanobell', in principle with an ostensibly detached core. 233 Similarly, dissolution of Fe 3 O 4 in Au/Si/Fe 3 O 4 hybrids has been shown to produce 'nanorattles', consisting of a hollow silica shell containing a small number of Au nanospheres 234 .…”

“…A core of an active metal such as Co can serve as a sacrificial template to prepare hollow gold nanoshells, and although the amount of red-shifting (the main technological motivation for doing this) initially obtained was initially relatively modest, further refinements to the process have demonstrated hollow gold nanoshells with strong plasmon resonance peaks that can be tuned from 520 to 850 nm . Alternatively, hybrid nanoparticle semishells of concentric layers of Au, Al, and Au have been prepared by physical vapor deposition onto a nanosphere template, and dissolution of the Al in an alkali produces a “nanobell”, in principle with an ostensibly detached core . Similarly, dissolution of Fe 3 O 4 in Au/Si/Fe 3 O 4 hybrids has been shown to produce “nanorattles”, consisting of a hollow silica shell containing a small number of Au nanospheres .…”