Size-Dependent Plasmonic Mode Evolution and SERS Performance of β-Sn Nanoparticles

Well crystallized β-Sn nanoparticles with different diameters have been prepared by a wet chemical method at different reaction temperatures. Both optical characterizations and finite element simulations confirmed that higher order resonance modes will appear when the size of nanoparticles is getting bigger and the plasmon resonance absorption peaks resulting from all resonance modes will keep red-shifting with the increasing of the size of nanoparticles. In addition, surface enhanced Raman scattering measurements and corresponding calculations indicate that β-Sn nanoparticles could reveal near-field enhancement effect and therefore could be an alternate efficient plasmonic material for the Si-based optoelectronic and/or photovoltaic devices.