Dresden 2003 – wissenschaftliches Programm

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O: Oberflächenphysik

O 8: Teilchen und Cluster

O 8.2: Vortrag

Montag, 24. März 2003, 15:15–15:30, HSZ/02

A direct colloidal route to conducting nanopatterns — •Agnes Mewe, Stefan Kooij, Herbert Wormeester, and Bene Poelsema — MESA+ Research Institute, University of Twente, P.O.Box 217, NL 7500 AE Enschede, The Netherlands

Selective deposition of gold nanoparticles from a colloidal suspension on Si-like substrates is achieved by microcontact printing of amino-functionalized entities (APTES). In one approach, the APTES is applied to a PDMS stamp and printed directly. Via a second route we obtain a patterned APTES layer by printing a long-chain methyl-functionalized polymer ink, and subsequent deposition of APTES on the non-printed area. Subsequently the substrates are immersed into a nanocolloidal gold suspension, leading to site selective adsorption of the nanoparticles on the amino-functionalized regions. As an encouraging result we indeed obtain clearly different particle densities judging from SEM-images. In a final step electrical conductivity will be achieved by electroless deposition of metal on the isolated gold nanocrystals. The feasibility of this seeded growth method will be judged by optical means in a search for a gradual enlargement of the nanocrystals past their percolation threshold.