Ringe, EmilieCollins, Sean M.DeSantis, Christopher J.Skrabalak, Sara E.Midgley, Paul A.2014-12-052014-12-052014Ringe, Emilie, Collins, Sean M., DeSantis, Christopher J., et al.. "Plasmon and compositional mapping of plasmonic nanostructures." <i>SPIE Proceedings,</i> 9278, no. 4 (2014) SPIE: http://dx.doi.org/10.1117/12.2073886.https://hdl.handle.net/1911/78581Recently, co-reduction of Au and Pd has allowed the synthesis of complex Au core/AuPd shell nanoparticles with elongated tips and cubic-like symmetry. Optical studies have shown strong plasmonic behavior and high refractive index sensitivities. In this paper, we describe the composition and the near-field plasmonic behavior of those complex structures. Monochromated STEM-EELS, Cathodoluminescence, and EDS mapping reveals the different resonant modes in these particles, and shows that Pd, a poor plasmonic metal, does not prevent strong resonances and could actually be extremely helpful for plasmon-enhanced catalysis.engThis is an author's peer-reviewed final manuscript, as accepted by the publisher. The published article is copyrighted by SPIE.Journal articleLSPRalloy nanoparticleselectron-energy loss spectroscopyplasmon mappingcathodoluminescenceelectron microscopyhttp://dx.doi.org/10.1117/12.2073886