As the size of the metal nanoparticles (Ag or Au) increases scattering efficiency will increase. When the particle size go beyond a particular value, scattering efficiency star to decrease. In most of the reports, this phenomenon is explained due to the formation of multipole excitation modes in large size nanoparticles.
[Ref: Ashraf U, Xiaohan Y. Surface Plasmonic Effects on Organic Solar Cells. J. Nanosci. Nanotechnol. 2014, 14: 1099–1119.
http://www.ncbi.nlm.nih.gov/pubmed/24749415]
Could you please give an explanation for this?
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The scattering of a particle, for example, in DLS analysis is proportional to d6. Big particles scatter more radiation than those small. I don't know which is the effect of the multiple excitation modes, but the scattering of the radiation of a particle show dependence of its particle size (Rayleigh).
Dear Edwin,
Thanks for your valuable comment.
But I'm looking for the reason behind why does scattering efficiency of metal nanoparticle decrease as the particle size is too large.
Check this explanations out
https://arxiv.org/pdf/1206.0530.pdf
http://ieeexplore.ieee.org/xpls/abs_all.jsp?arnumber=833887&tag=1
https://www.osapublishing.org/josab/viewmedia.cfm?uri=josab-30-10-2589
and
http://www.nature.com/nmat/journal/v15/n3/full/nmat4563.html
These papers claim it is the nature of the spherical bessel functions and henkel functions in the expression for the scattering cross sections . Hope this helps.
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