Effect of Nanoparticle size on the Ag LSPR

The relationship between nanoparticle size and the LSPR extinction maximum, A- ax. has been recognized, though not fully understood, for many years. As atomic force microscopy, scanning electron microscopy, and tunneling electron microscopy have 

Nanopardcle shape also has a significant effect on the of the LSPR. When the 

Standard triangular nanoparticles are thermally annealed at 300 C under vacuum, the nanoparticle shape is modified, increasing in out-of-plane height and becoming ellipsoidal. This structural transition results in a blue shift of-200 nm in the of the 

It is often difficult to decouple size and shape effects on the LSPR wavelength, and so they are considered together as the nanoparticle aspect ratio (a/b). Large aspect ratio values represent oblate nanoparticles and aspect ratios with a value of unity represent spheroidal nanoparticles. 

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