Regensburg 2019 – wissenschaftliches Programm

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DS: Fachverband Dünne Schichten

DS 1: Optical Analysis of Thin Films I (Reflection, Ellipsometry, Raman, IR-DUV Spectroscopy, ...

DS 1.7: Vortrag

Montag, 1. April 2019, 11:30–11:45, H32

Revealing the distinct structural and plasmonic properties of gold nanosponges through FIB nanotomographical reconstruction — •Peter Schaaf, Lars Hauke Honig, and Dong Wang — TU Ilmenau, Institute of Materials Science and Engineering and Institute of Micro and Nanotechnologies MacroNano(R), Gustav-Kirchhoff-Str. 5, 98693 Ilmenau, Germany

Individual gold nanosponges (nanoporous gold nanoparticles) which were fabricated by solid state dewetting of Ag/Au bilayers and subsequent dealloying, are reconstructed from SEM images captured by FIB nanotomography. The investigated particles have diameters in the range of a few hundred nanometers and ligament diameters around 12 nm. The optical and plasmonic properties of the gold nanosponges are clearly different from that of the solid nanoparticles, and are more complex and fascinating due to unique structural features. In this work, the 3D reconstructed models of gold nanosponges, which correspond precisely to the real structures, have been used for the simulation. The results show that the plasmon peak shifts red and multiple resonance behavior appears with increasing porosity. [1] D. Wang et al., J. Mater. Chem., 2012, 22, 5344. [2] Fujita, T. et al., Applied Physics Letters, 2008, 92, 251902. [3] Vidal C. et al., ACS Photonics 2015, 2, 1436. [4] Rao W. et al., ACS Appl. Mater. Interfaces 2017, 9, 6273. [5] Vidal, C. et al., Nano Lett 2018, 18, (2), 1269. [6] Hergert, G. et al., Light Sci. Appl. 2017, 6, e17075.