Titel:	Orthogonal substrate functionalization using additive contact lithography
Autor(en):	Alarslan, Fatih
Erstgutachter:	Prof. Dr. Martin Steinhart
Zweitgutachter:	Prof. Dr. Uwe Beginn
Zusammenfassung:	This work focuses on the orthogonal substrate functionalization by using parallel, additive contact lithography. Orthogonal functionalization of substrates patterned by capillary stamping may yield functional hybrid layers, in which the properties of the stamped pattern and the second component can be coupled. The coupling of functional films can lead to both additive and synergistic effects, allowing the properties of the hybrid film to be targeted for specific applications. Three different examples were investigated for this purpose. Lithiumniobate (LiNbO3), nickel ferrite (Ni2Fe4O4), and poly(2-(methacryloyloxy)ethyl ferrocenecarboxylate) (PFcMA) were each stamped and orthogonally functionalized with various components. While the stamping of LiNbO3 on previously developed stamping techniques, the other two examples involve new developed stamping techniques such as solvothermal stamping and stamping from polymer melts. Microstructured LiNbO3 holey films were generated by direct stamping with a polystyrene-block-poly(2-vinylpyridine) (PS-b-P2VP) stamp an aqueous solution of lithium acetate (C2H3LiO2) and niobium oxalate hydrate (C10H5NbO2 • 6 (H2O)). Calcination of the stamped precursor film on ITO resulted in pure LiNbO3 without any impurities. Orthogonal modification of the LiNbO3-film with gold nanoparticles via electrodeposition at the positions of the macropores increased the intensity of the second harmonic output by a factor of 5.4. Capillary imprinting with DNHG-derived aerogel stamps combined with a solvothermal synthesis based on ethanol solutions of iron(III) acetylacetonate (Fe(C5H7O2)3) and nickel(II) acetylacetonate (C10H14NiO4) yielded submicron arrays of nickel ferrite dots on indium tin oxide (ITO) substrates. Then, the ITO substrates functionalized with ordered monolayers of submicron nickel ferrite dots were further orthogonally functionalized with metallic nickel by electrodeposition. The submicron nickel ferrite dots reduced the remanence of the ferromagnetic nickel film by half, while the saturation value of the magnetic moment per area remained largely constant. Furthermore, hybrid stamps made of Ni/MnO2 were generated for capillary microstamping of the stimuli-responsive ferrocene-containing polymer (PFcMA) blended with multiwalled carbon nanotubes (CNTs) from the melt. Electrochemical WCA switching reversibly transformed the PFcMA-CNT hybrid microdots from a high-WCA state, in which the PFcMA is reduced, to a low-WCA state, in which the PFcMA is oxidized (the ferrocene units are positively charged), and vice versa. Orthogonal substrate functionalization of the areas around the PFcMA-CNT hybrid microdots shifted the WCA switching range by nearly 50°.
URL:	https://doi.org/10.48693/354 https://osnadocs.ub.uni-osnabrueck.de/handle/ds-202307189290
Schlagworte:	Capillary microstamping; Thin films of functional materials
Erscheinungsdatum:	18-Jul-2023
Publikationstyp:	Dissertation oder Habilitation [doctoralThesis]
Enthalten in den Sammlungen:	FB05 - E-Dissertationen

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