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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 10: Polymer Physics I

CPP 10.1: Vortrag

Montag, 23. März 2009, 18:00–18:15, ZEU 114

Fabrication of Metallic/Bimetallic Microtubes using Self-rolled Polymer Tubes as Templates — •Kamlesh Kumar¹, Bhanu Nandan¹, Valeriy Luchnikov², Bhoje Gowd¹, and Manfred Stamm¹ — ¹Leibniz Institute of Polymer Research Dresden, Hohe Strasse 6, 01069 Dresden, Germany — ²Institute de Chimie des Surfaces et Interfaces, rue Jean Starcky 15, 68057 Mulhouse, France.

We present a new approach to fabricate single and bimetallic (Au, Ti, and Au/Ti) microtubes with high aspect ratio using self-rolled polymer tubes as templates. This approach is based on the phenomenon of the stress relaxation of thin multi-layer films via curling. We explore self-rolling of a cross-linked polymer film, capped by metallic or bimetallic layer, in an organic solvent. In a typical fabrication scheme, the multilayer consists of the bottom poly(4-vinylpyridine) (P4VP) film, the intermediate polystyrene (PS) film, and the top metallic or bimetallic film is used. The internal stress and the bending moment are induced in the film due to swelling of the bottom P4VP layer after dipping the sample into aqueous solution of dodecylbenzenesulfonic acid (DBSA). The length of the tubes and the direction of rolling are determined by mechanical patterning of the film, whereas the tube diameter is tailored by varying the thickness of the polymer and metallic layers. After rolling, polymer template is removed by pyrolysis resulting in pure metal microtubes. Metallic microtubes fabricated by self-rolling approach may find applications in such fields as IR-waveguiding, microfluidics, enzyme bi-reaction, chemical and biochemical sensing.