Regensburg 2022 – scientific programme
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O: Fachverband Oberflächenphysik
O 35: Poster Tuesday: Plasmonics and Nanooptics 1
O 35.1: Poster
Tuesday, September 6, 2022, 11:00–13:00, P3
Positioning of DNA origami based nanostructures on surfaces by lithographic patterning — Zhe Liu1, Zunhao Wang2, Birka Lalkens3, Daesung Park2, Jannik Guckel2, Juliane Breitfelder3, and •Markus Etzkorn1 — 1Institute of Applied Physics, Technische Universität Braunschweig, 38106 Braunschweig, Germany — 2Physikalisch Technische Bundesanstalt, 38116 Braunschweig, Germany — 3Institute of Semiconductor Technology, Technische Universität Braunschweig, 38106 Braunschweig, Germany
Self-assembly protocols of functionalized DNA-origami structures can be used to create large amounts of identical hybrid nanostructures. We use this approach to create structures with tunable plasmonic properties. In our study, dimers of 15 nm gold nanoparticles with an average gap of 7 nm were self-assembled in solution. In order to control the positioning of such DNA-origami structures on surfaces, we created surface areas with hydrophobic/hydrophilic contrast by electron beam lithography and dry oxidative etching. This protocol offers positional control on the sub 10 nm scale. Here we will present results for hexamethyldisilazane (HDMS) covered silicon, but the approach can be utilized for various substrates and nanostructures. Our origami/dimer structure shows highly selective adsorption on different lithographically patterned structures. We achieve an efficiency in positioning, that is the ratio of origami in wanted to those in unwanted positions, of above 95%. Important parameters controlling the efficiency are discussed.