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DS: Fachverband Dünne Schichten

DS 17: Contact Properties (SYOE 10)

DS 17.6: Vortrag

Mittwoch, 28. März 2007, 18:30–18:45, H32

Fabrication and temperature-dependent conductivity studies of conducting polymer nanowires — J.H. Franke, B. Dong, H. Fuchs, and •L. Chi — Physikalisches Institut, WWU Münster, Wilhelm-Klemm-Str. 10

We describe a general approach to pattern conductive polymer nanowires, e.g. polypyrrole (PPy), at pre-defined areas on insulating surfaces and to address the wires with external microelectrodes. E-beam lithography and AFM lithography were used to create defined surface patterns. The successful construction of PPy structures (10-120 nm in thickness and down to 80 nm in width) was achieved by employing a random copolymer strategy combined with self-assembly. The process can also be applied to structures of substituted thiophene, aniline and their derivatives. Furthermore, surface patterns created by parallel processes like nanoimprint lithography (NIL) can be combined with this method to construct large area polymer nanowire devices. Temperature-dependent conductivity studies on polymer structures were carried out to check for a metal-insulator transition. Results indicate an increasingly 'insulating' behaviour with decreasing thickness, e.g. a steeper rise in conductivity with increasing temperature.

1. B. Dong, N. Lu, M. Zelsmann, N. Kehagias, H. Fuchs, C.M. Sotomayor Torres, L. Chi Adv. Funct. Mater. 16,1937 (2006).

2. B. Dong, D. Zhong, L. Chi, H. Fuchs, Adv. Mater. 2005, Adv. Mater. 17 (2005) 2736.

3. B. Dong, M. Krutschke, X. Zhang, L. Chi, H. Fuchs, Small, 1 (2005), 520-524.