SKM 2021 – scientific programme
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 7: Soft Matter (joint session CPP/DY)
CPP 7.2: Talk
Wednesday, September 29, 2021, 10:30–10:45, H3
UV-light printing on APTES functionalized SiO2 surfaces: New approach for nanoparticle assembly — •Sergii Snegir1, Olivier Plichery2, Thomas Huhn1, and Elke Scheer1 — 1University of Konstanz, Konstanz, Germany — 2INSP, Sorbonne University, France
The 3-Aminopropyl)trimethoxysilane (APTES) terminated SiO2 surface allows creating self-assembled monolayers (SAMs) of gold nanoparticles (AuNPs). However, further functionalization of AuNPs with thiol-containing molecules leads to their strong aggregation 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, the concentration of O2, N2, O3 gases (1). We have found that the combination of O3 and UV light under ambient atmospheric conditions lead 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 (resolution limit several um) on a SiO2 surface (glass/quartz/silicon). 1. S.Snegir, T.Huhn,J. Boneberg, S.Haus, O.Pluchery, E.Scheer, J.Phys.Chem.C, 2020,124(35), 19259-19266.