Berlin 2012 – wissenschaftliches Programm

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 22: Poster: Charged Soft Matter

CPP 22.3: Poster

Mittwoch, 28. März 2012, 11:00–13:00, Poster A

Substrate effects of the substrate on the formation of polyelectrolyte multilayers — •Maximilian Zerball, Chloé Chevigny, and Regine von Klitzing — Stranski-Laboratorium, Institut für Chemie, TU 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 gives the opportunity for a wide variety of potential applications for polyelectrolyte multilayers (PEM), for example chemical reactors, antireflective coatings or microcontainers.

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 the PEM is still missing. Especially, for hybrid/composite materials the connection (interphase) between the PEM and a solid material is important. This addresses planar surfaces like metal or semiconductors as substrates, but also solid particles. For this purpose different substrates were studied by directly changing the nature of the substrate (Silicon or Gold), but also by chemical modification of 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.

The properties of the PEM are monitored after the deposition as a function of the number of layers by a complementary use of ellipsometry (with humidity control) and AFM. The question is, how far and how strong the structure of the PEM is affected by the substrate.