Dresden 2011 – wissenschaftliches Programm

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 21: Poster: Confinement of Polymers in Nanoscopic Layers - How Much do Properties Change?

CPP 21.7: Poster

Dienstag, 15. März 2011, 18:00–20:00, P2

Effect of substrate on the formation of polyelectrolytes multilayers — •Maximilian Zerball, Samantha Micciulla, Chloé Chevigny, and Regine von Klitzing — Stranski-Lab., TU Berlin, Institut für Chemie, Sekr. TC 9, 10623 Berlin

For the past twenty years, the Layer-by-Layer technique (LbL) has made it possible to modify surfaces by covering them with thin films. This technique opened the door for a wide variety of potential applications for polyelectrolyte multilayers (PEM), for example chemical reactors, antireflective coatings, containers or filtration membranes. The deposition of PEMs is influenced by various parameters, such as ionic strength, pH value and charge density. But a systematic study of the substrate effect on this deposition is still missing: this poster will present results which focus on the influence of the substrate on the formation of the multilayers. For this purpose different substrates are studied: by directly changing the nature of the substrate (Silicon or Gold), but also by chemically modifying the silicon surface using silanization (change of both substrate charge and interactions with polyelectrolytes). For polyelectrolytes we chose to use the two most widely spread systems, PSS/PAH and PSS/PDADMAC, both either with long or short chain lengths. The thickness, roughness and aspect of the PEM are monitored as a function of the number of layers deposited by a complementary use of ellipsometry (with humidity control) and AFM. We can then very finely determine the substrate influence zone, and what the vicinity to the substrate changes inside this zone.