Berlin 2015 – scientific programme

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O: Fachverband Oberflächenphysik

O 35: Nanostructures at Surfaces

O 35.17: Poster

Tuesday, March 17, 2015, 18:15–21:00, Poster A

Protein-Assisted Assembly of Nanoparticles on Nanoparticles: Toward Plasmonic Nanoclusters — •Roland Höller, Andreas Fery, and Munish Chanana — Department of Physical Chemistry II, University of Bayreuth, 95440 Bayreuth, Germany

Metallic core-satellite nanoclusters are highly interesting for their potential applications in the fields of surface-enhanced Raman spectroscopy (SERS), light harvesting, and optical metamaterials due to their ability to support localized surface plasmons and thus allowing to manipulate electromagnetic fields at the nanoscale.[1] Many strategies have been developed to assemble colloidal plasmonic nanoparticles into metal-metal core-satellite nanoclusters using small alpha-omega end-functionalized molecular linkers, viruses, and DNA.[2] However, most of these approaches for nanocluster fabrication are either limited to 2D structures on substrates or arduous and expensive in synthesis. In this work, we present a novel protein-assisted nanoparticle assembly method, which is simple, inexpensive and upscalable, yielding highly stable and well-defined plasmonic core-satellite nanoclusters with small interparticle distances. The morphology of the nanoclusters was characterized using TEM and SEM. The optical properties were studied at the ensemble level and single cluster level by means of UV-Vis spectroscopy and dark-field optical microscopy and spectroscopy.

[1] Fan et al., Science 2010, 328, 1135.

[2] a) Gandra et al., Nano Letters 2012, 12, 2645; b) Li et al., Small 2012, 8, 3832; c) Sebba et al., Nano Letters 2008, 8, 1803.