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O: Fachverband Oberflächenphysik
O 56: Poster Session - Nanostructures at Surfaces: Dots, Particles, Clusters
O 56.1: Poster
Dienstag, 17. März 2020, 18:15–20:00, P2/2OG
UV-light printing on APTES functionalized SiO2 surfaces: New approach for nanoparticle assembly — •Sergii Snegir1, Olivier Pluchery2, Thomas Huhn1, and Elke Scheer1 — 1University of Konstanz, Konstanz, Deutschland — 2Institut des Nano-Sciences de Paris (INSP), Sorbonne Universités, CNRS, Paris, France
The (3-Aminopropyl)trimethoxysilane (APTES) terminated SiO2 surface allows creating self-assembled monolayers (SAMs) of gold nanoparticles (AuNPs) if they are stabilized with trisodium citrate molecules. However, further functionalization of AuNPs with thiol-containing molecules leads to their strong aggregation on the surface due to the appearance of uncompensated dipole moments on the AuNP. Therefore, we developed a UV-light fixation method, which anchors AuNPs on their initial positions on the APTES surface prior to the process of AuNP functionalization. Herein, we present detailed studies of the passivation efficiency as the function of UV light wavelength, time of exposure, concentration of O2, N2, O3 gases. We have found that the combination of O3 and UV light under ambient atmospheric conditions leads to complete passivation of APTES terminated glass already after 2 min of UV exposure ( 26.1 mW/cm2). We have tested also the possibility to use the UV-light passivation for printing on APTES terminated surfaces by using different chromium masks. With this method, we can create SAMs of AuNP with different geometry and size (current resolution limit is several um) on a SiO2 surface (glass/quartz/silicon).