my question is not only about silver or gold but any other metal nano-particles. Anyway, I'm personally interested in silver. So why do the tiny clusters (several atoms) of silver and gold possess fluorescence and nano-particles (1-100 nm) don't? Where is a limit of size of nano particle, when it becomes non-luminescent and has surface plasmon resonance? Let the surrounding of the nano-particles is water or similar liquid, they are protected somehow from aggregation and so on.
Hi,
Tiny clusters of gold and silver show fluorescence property due to discritization in band gap structure. Reorganization of band structure at nano dimension is the main reason for the fluorescence of semiconductor nanoparticles. If you can control the size of gold nanoparticles you can get fluorescent gold. The optical property is a size dependent interplay between collective oscillation (plasmon) and quantized absorbence of incident light.
Hi,
Tiny clusters of gold and silver show fluorescence property due to discritization in band gap structure. Reorganization of band structure at nano dimension is the main reason for the fluorescence of semiconductor nanoparticles. If you can control the size of gold nanoparticles you can get fluorescent gold. The optical property is a size dependent interplay between collective oscillation (plasmon) and quantized absorbence of incident light.
I get fluorescence for gold nano rods. When Gold nano spheres capped with serum albumin it exhibit fluorescence.metal capped GNPs don't show fluorescence
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