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Physical Chemistry Chemical Physics

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Phys. Chem. Chem. Phys., 2009, 11, 5909 - 5914, DOI: 10.1039/b905200n

The effect of surface roughness on the plasmonic response of individual sub-micron gold spheres

Jessica Rodríguez-Fernández, Alison M. Funston, Jorge Pérez-Juste, Ramón A. Álvarez-Puebla, Luis M. Liz-Marzán and Paul Mulvaney

Nanoscale surface corrugation strongly determines the plasmonic response of gold nanoparticles with dimensions of several tens of nanometres. Scattering spectra of individual spheres with a rough surface were found to red-shift and broaden. The plasmon modes exhibited quadrupole damping, in contrast to particles with smooth surfaces. Additionally, rougher spheres display a higher SERS activity, which demonstrates the crucial role of nanoscale surface texturing on the plasmonic response of gold particles.

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