DNA Origami‐Directed Self‐Assembly of Gold Nanospheres for Plasmonic Metasurfaces

Sikeler, Christoph; Haslinger, Franziska; Martynenko, Irina V. und Liedl, Tim (2024): DNA Origami‐Directed Self‐Assembly of Gold Nanospheres for Plasmonic Metasurfaces. In: Advanced Functional Materials

Abstract

Plasmonic nanostructures are frequently utilized to create metasurfaces with a large variety of optical effects. Control over shape and positioning of the nanostructures is key to the function of such plasmonic metasurfaces. Next to lithographic means, directed self-assembly is a viable route to create plasmonic structures on surfaces with the necessary precision. Here, a combined approach of DNA origami self-assembly and electron beam lithography is presented for determinate positioning of gold nanospheres on a SiO2 surface. First, DNA origami structures bind to the electron beam-patterned substrate and subsequently, gold nanoparticles attach to a defined binding site on the DNA origami structure via DNA hybridization. A sol-gel reaction is then used to grow a silica layer around the DNA, thereby increasing the stability of the self-assembled metasurface. A mean yield of 74% of single gold nanospheres is achieved located at the determinate positions with a spatial position accuracy of 9 nm. Gold nanosphere dimers and trimers are achieved with a rate of 65% and 60%, respectively. The applicability of this structuring method is demonstrated by the fabrication of metasurfaces whose optical response can be tuned by the polarization of the incoming and the scattered light.

• Dokumententyp: Zeitschriftenartikel
• Fakultät: Physik > Experimentalphysik
• Themengebiete: 500 Naturwissenschaften und Mathematik > 530 Physik
• ISSN: 1616-301X
• Sprache: Englisch
• DFG: Gefördert durch die Deutsche Forschungsgemeinschaft (DFG) - 390776260