title: Nanoscale mapping of plasmon resonances of functional multibranched gold nanoparticles.
abstract: The optical response of multibranched gold nanoparticles is studied by means of electron energy-loss spectroscopy (EELS) in aberration corrected STEM mode. In every case the plasmon response is constant and variations in the maxima positions were found to be dependent on the branches aspect ratio. The good spatial resolution combined with the high energy resolution (0.18 eV) of the monochromated electron beam allows mapping the different plasmonic modes along the entire nanoparticles ranging from 0.7 eV up to 2.25 eV.
authors: Laboratorio de Microscopias Avanzadas, Instituto de Nanociencia de Aragon (INA), Universidad de Zaragoza, Mariano Esquillor, Edificio I+D, 50018, Zaragoza, Spain. amayoral@unizar.es
authors: Alvaro
authors: A
authors: Mayoral
authors: Cesar
authors: C
authors: Magen
authors: Miguel
authors: M
authors: Jose-Yacaman
mesh_terms: D006046:Gold / Q000737:chemistry*; D053768:Metal Nanoparticles / Q000737:chemistry* / Q000648:ultrastructure*; D046032:Microscopy, Energy-Filtering Transmission Electron / Q000379:methods; D013053:Spectrophotometry; D046590:Spectroscopy, Electron Energy-Loss / Q000379:methods*
chemical_list: D006046:Gold