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Nanoscale mapping of plasmon resonances of functional multibranched gold nanoparticles
Alvaro Mayoral1, Cesar Magen, Miguel Jose-Yacaman
1Laboratorio de Microscopias Avanzadas, Instituto de Nanociencia de Aragon (INA), Universidad de Zaragoza, Mariano Esquillor, Edificio I+D, 50018, Zaragoza, Spain. amayoral@unizar.es
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.
