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O: Fachverband Oberflächenphysik

O 46: Plasmonics and Nanooptics IV: Fabrication and Applications

O 46.2: Vortrag

Mittwoch, 20. März 2024, 10:45–11:00, MA 042

Controlling Nanoparticle Distance by On-surface DNA-origami Folding — Zhe Liu¹, Zunhao Wang², Jannik Guckel², Daesung Park², Ziba Akbarian¹, Uta Schlickum¹, and •Markus Etzkorn¹ — ¹Technische Universität Braunschweig, 38106 Braunschweig, Germany — ²Physikalisch-Technische Bundesanstalt, 38116 Braunschweig, Germany

This study introduces a novel method that combines top-down lithography with bottom-up DNA origami techniques to achieve accurate manipulation of nano-objects on pre-patterned silicon surfaces. Using electron beam lithography, we determined specific sites where DNA origami-nanoparticle hybrid nanostructures can adsorb, enabling precise and controlled arrangement of adsorption patterns in several dimensions. The specific adsorption of the DNA origami leads to controllable deformations if the origami helices are defined by the shape of the pre-patterned adsorption site. This approach also works for origami functionalized with two gold nanoparticles (AuNPs). This unique behavior allows for tunable assembly of plasmonic dimer nano-arrays, showing the ability to manipulate the center-to-center distance of AuNPs dimers on the origami template. The efficiency and precision of this technique were confirmed with Raman spectroscopy of dye molecules coated on the AuNPs. The results show the great potential for creating nanoarrays with precise control over nanoscale dimensions and orientation. This opens up new possibilities for using these nanoarrays in fields such as biomedicine and nano-photonics.

Keywords: DNA origami; AuNPs dimer; polar surface adsorption; on-surface folding; surface enhanced Raman spectroscopy