New insights into colloidal gold flakes: structural investigation, micro-ellipsometry and thinning procedure towards ultrathin monocrystalline layers

Journal article


Publication Details

Author(s): Hoffmann B, Bashouti MY, Feichtner T, Mackovic M, Dieker C, Salaheldin AM, Richter P, Gordan OD, Zahn DRT, Spiecker E, Christiansen S, Hoffmann B
Journal: Nanoscale
Publisher: Royal Society of Chemistry
Publication year: 2016
Volume: 8
Journal issue: 8
Pages range: 4529-4536
ISSN: 2040-3364


Abstract


High-quality fabrication of plasmonic devices often relies on wet-chemically grown ultraflat, presumably single-crystalline gold flakes due to their superior materials properties. However, important details about their intrinsic structure and their optical properties are not well understood yet. In this study, we present a synthesis routine for large flakes with diameters of up to 70 mu m and an in-depth investigation of their structural and optical properties. The flakes are precisely analyzed by transmission electron microscopy, electron backscatter diffraction and micro-ellipsometry. We found new evidence for the existence of twins extending parallel to the Au flake {111} surfaces which have been found to not interfere with the presented nanopatterning. Micro-Ellipsometry was carried out to determine the complex dielectric function and to compare it to previous measurements of bulk single crystalline gold. Finally, we used focused ion beam milling to prepare smooth crystalline layers and high-quality nanostructures with desired thickness down to 10 nm to demonstrate the outstanding properties of the flakes. Our findings support the plasmonics and nano optics community with a better understanding of this material which is ideally suited for superior plasmonic nanostructures.



FAU Authors / FAU Editors

Dieker, Christel
Lehrstuhl für Werkstoffwissenschaften (Mikro- und Nanostrukturforschung)
Hoffmann, Björn
Lehrstuhl für Experimentalphysik (Optik)
Mackovic, Mirza Dr.-Ing.
Lehrstuhl für Werkstoffwissenschaften (Mikro- und Nanostrukturforschung)
Spiecker, Erdmann Prof. Dr.
Lehrstuhl für Werkstoffwissenschaften (Mikro- und Nanostrukturforschung)


Additional Organisation
Graduiertenkolleg 1896/2 In situ Mikroskopie mit Elektronen, Röntgenstrahlen und Rastersonden
Interdisziplinäres Zentrum, Center for Nanoanalysis and Electron Microscopy (CENEM)
Exzellenz-Cluster Engineering of Advanced Materials
Lehrstuhl für Werkstoffwissenschaften (Mikro- und Nanostrukturforschung)


External institutions with authors

Max-Planck-Institut für die Physik des Lichts (MPL) / Max Planck Institute for the Science of Light
Technische Universität Chemnitz


Research Fields

C Photonic and Optical Materials
Exzellenz-Cluster Engineering of Advanced Materials
A2 Nanoanalysis and Microscopy
Exzellenz-Cluster Engineering of Advanced Materials
A3 Multiscale Modeling and Simulation
Exzellenz-Cluster Engineering of Advanced Materials


How to cite

APA:
Hoffmann, B., Bashouti, M.Y., Feichtner, T., Mackovic, M., Dieker, C., Salaheldin, A.M.,... Hoffmann, B. (2016). New insights into colloidal gold flakes: structural investigation, micro-ellipsometry and thinning procedure towards ultrathin monocrystalline layers. Nanoscale, 8(8), 4529-4536. https://dx.doi.org/10.1039/c5nr04439a

MLA:
Hoffmann, B., et al. "New insights into colloidal gold flakes: structural investigation, micro-ellipsometry and thinning procedure towards ultrathin monocrystalline layers." Nanoscale 8.8 (2016): 4529-4536.

BibTeX: 

Last updated on 2019-29-05 at 09:28