Berlin 2008 – wissenschaftliches Programm

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 14: Membranes

CPP 14.6: Vortrag

Dienstag, 26. Februar 2008, 16:15–16:30, C 230

Nanoporous Templates from Supramolecular Assembly of Block Copolymers — •Bhanu Nandan, Marcus Böhme, Radim Krenek, and Manfred Stamm — Leibniz Institute of Polymer Research Dresden, Hohe Strasse 6, 01069 Dresden

Highly ordered arrays of nanostructures derived from block copolymer self-assembly have attracted lot of attention for nanotechnological applications, such as in nanostructured networks and membranes, nanoparticles templates and nanoreactors, photonic crystals, and high density information storage media. In the present work, we investigated nanotemplates based on supramolecular assembly (SMA) of polystyrene-block-poly(4-vinylpyridine) (PS-b-P4VP) and a low molar mass additive 2-(4’-hydroxyphenylazo)benzoic acid (HABA). The strong repulsion between PS and P4VP in this system allowed fabrication of templates with characteristic length-scale which was not accessible in the past with other block copolymers. Moreover, the morphology of these nanotemplates could be tailored by (1) choosing block copolymer of appropriate block length ratio, (2) varying concentration of HABA, or (3) by blending the SMA with respective homopolymers. Long range order was improved by solvent annealing under controlled conditions and using substrates of low roughness. It is further shown that the SMA fabricated in this work can be used to template various functional inorganic nanostructures by electrodeposition, physical vapour deposition or by soaking in nanoparticle solutions.