Open Structured TiO2Nanoparticle Polystyrenesulfonate Films

The assembly of 35-nm diameter TiO2 (Degussa P25) was possible at pH 3.8 (when the particles were positive) in alternation with PSS. TiO2 assembly with polycation PDDA at this pH was not possible. The saturation adsorption time for TiO2 nanoparticles was 5 min. The growth step of the TiO2/PDDA multilayer was stable and linear, with the mass adsorption increment corresponding to the monolayer surface coverage. The SEM of the TiO2/PSS multilayer shows not a close-packed but an open structure of the film. It was possible to vary the porosity of the film by changing the ionic strength of nanoparticle dispersions. Such porous structures can be useful for catalytic applications.

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