American Chemical Society
nn3011224_si_011.avi (4 MB)

Synchronous Emission from Nanometric Silver Particles through Plasmonic Coupling on Silver Nanowires

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posted on 2012-07-24, 00:00 authored by Melari Davies, Angela Wochnik, Florian Feil, Christophe Jung, Christoph Bräuchle, Christina Scheu, Jens Michaelis
We investigated silver nanowires using correlative wide-field fluorescence and transmission electron microscopy. In the wide-field fluorescence images, synchronous emission from different distinct positions along the silver nanowires was observed. The sites of emission were separated spatially by up to several micrometers. Nanowires emitting in such cooperative manner were then also investigated with a combination of transmission electron microscopy based techniques, such as high-resolution, bright-field imaging, electron diffraction, high-angle annular dark-field imaging, and energy-dispersive X-ray spectroscopy. In particular, analyzing the chemical composition of the emissive areas using energy-dispersive X-ray spectroscopy led to the model that the active emissive centers are small silver clusters generated photochemically and that individual clusters are coupled via surface plasmons of the nanowire.