Tuning the surface plasmon resonance by preparation of gold-core/silver-shell and alloy nanoparticles F. Hubenthal, T. Ziegler, C. Hendrich, M. Alschinger and F. Träger Eur. Phys. J. D, 34 1-3 (2005) 165-168 Published online: 13 July 2005 DOI: 10.1140/epjd/e2005-00138-1