The localized surface plasmons are not related to the noble metals only. You need to satisfy plasmon resonance conditions (i.e. epsilon_NP = -2 x epsilon_environment). As a result, there are few known metals which exhibit resonance in the visible region: Cu, Au, Pd, Pt, and Ag. Actually, Au and Ag have quite strong resonance, while Pd and Pt are very weak. Cu is also fine, but it is not stable because of the surface oxides. It has been reported that Al is fine for the UV region, but actually it is not very used. Quite fine review paper on this topic wass done by Rycenga et al, Chem. Rev. 111, 3669 (2011), but there is also a lot of other papers on this topic.
Because of there charge transfer and optical resonance is high.
The localized surface plasmons are not related to the noble metals only. You need to satisfy plasmon resonance conditions (i.e. epsilon_NP = -2 x epsilon_environment). As a result, there are few known metals which exhibit resonance in the visible region: Cu, Au, Pd, Pt, and Ag. Actually, Au and Ag have quite strong resonance, while Pd and Pt are very weak. Cu is also fine, but it is not stable because of the surface oxides. It has been reported that Al is fine for the UV region, but actually it is not very used. Quite fine review paper on this topic wass done by Rycenga et al, Chem. Rev. 111, 3669 (2011), but there is also a lot of other papers on this topic.
“A high percentage of Pb atoms accumulate at the surface which exhibits the special features of Pb metallic nanoclusters like strong absorption band and localized Surface Plasmon Resonance (SPR); these features are caused by the quantum confinement effects of Pb metallic nanoclusters as said earlier and could not be seen in bulk Pb or in Pb atom or in lead oxides; SPR is a parameter in the characterization of Pb metal nanoparticles and it is useful for tracing Pb nanoparticles”. – Download the paper from https://www.researchgate.net/publication/235360269_Lead_Nanopowder_as_Advanced_Semi-Conductor_An_Insight/file/72e7e51f761990b0b3.pdf
Article Lead Nanopowder as Advanced Semi-Conductor, An Insight
Apart from noble metal nanoparticles, Localised SPR is present in Copper and lead nanoparticles also too. Quantum confinement effect of metallic nanoclusters is the main reason for SPR.
Some metal nanoparticles show surface plasmon absorption in visible region and other metal nanoparticles shows in UV region.
Does the surface plasmon absorption effect in visible region of metallic copper nanoparticles depend on the size of the particles?
Can these effects explain the reduction of the gap up to 1.5eV of TiO2 with metallic copper naoparticles on the surface of TiO2 doped Cu2+ crystallites ?
The number density of free electrons (plasma frequency) play an important role in producing the localized surface plasmon resonance. The elements having plasma frequency satisfing certain criteria for plasmon resonance can provide LSPR in the visible range. Even the value of plasma frequency decides the location of plasmon resonance in the spectrum. Mostly Au, Ag and copper satisfies the criteria. Copper is unstable due to its oxidising nature. Al can provide LSPR peak in UV region.
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