Dresden 2014 – wissenschaftliches Programm
Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe
O: Fachverband Oberflächenphysik
O 98: Plasmonics and Nanooptics V
O 98.7: Vortrag
Freitag, 4. April 2014, 12:00–12:15, TRE Ma
Electrochemical route to large-area mono-crystalline gold platelets for plasmonic applications — •Bettina Frank1, Adrian Ruff2, Sabine Ludwigs2, and Harald Giessen1 — 14th Physics Institute and Research Center SCoPE, University of Stuttgart, Germany — 2Institute of Polymer Chemistry, University of Stuttgart, Germany
We fabricate high-quality gold platelets for plasmonic applications using an electrochemical approach. This process consists of dissolution of a sacrificial gold electrode by cyclic voltammetry in HCl-water-based electrolytes with a 3-electrode setup. Within a specific negative voltage range the Au ions are reduced back to gold atoms and can rearrange in micrometer-sized monocrystalline hexagons, triangles and truncated triangles. Placed underneath the sacrificial electrode, any kind of substrate collects the high-quality microstructures. The particles can be tailored in size, thickness, and number per area, depending on the electrochemical parameters. Sizes of several tens of micrometers can be reached, and thicknesses are in the 10-100 nm range. To demonstrate single-crystallinity, we perform AFM surface analysis which demonstrates that our structures are extremely flat, down to monoatomic flatness. TEM studies confirm the single-crystallinity via electron diffraction by showing the exact hexagonal arrangement of the gold atoms. Our single-crystalline gold platelets will serve as bulk material for high quality plasmonic structures and long-range propagation.