SurfaceScience21 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 11: Poster Session I: Plasmonics and nanooptics I

O 11.1: Poster

Montag, 1. März 2021, 10:30–12:30, P

Fabrication and transfer of hexagonal gold nano-pyramid arrays on PDMS for SERS — •Peter Christian Simo¹, Florian Laible¹, Anke Horneber¹, Claus Burkhardt², and Monika Fleischer¹ — ¹Institute for Applied Physics, University of Tuebingen, Germany — ²Natural and Medical Sciences Institute at the University of Tuebingen, Reutlingen, Germany

Surface enhanced Raman scattering (SERS) with pyramidal nanostructures increases the signal of Raman active analytes, since hotspots form at the edges and tip of a nano-pyramid under illumination. 2D hexagonal arrays of pyramidal nanostructures with a quadratic base are fabricated through cost-effective nano-sphere lithography and transferred onto PDMS. Under varying uniaxial strain the localized surface plasmon resonances (LSPRs) of the nanostructures on the PDMS can also be analysed. By making use of the (111) crystal plane of a silicon (100) wafer, an inverted pyramidal array is etched, which serves as the complementary negative for the gold nanostructures. Either a continuous gold thin-film with protruding pyramids or separate isolated nano-pyramids are produced. The use of a linker molecule between the PDMS and the gold is mandatory to increase the weak Au-PDMS adhesion. (3-Mercaptopropyl)triethoxysilane (MPTS) is able to bind to both PDMS and to the gold structures, thus strongly increasing stability for mechano-optical experiments. The SERS enhancement is verified by Raman mapping of 4-Mercaptobenzoic acid molecules.