Dresden 2009 – scientific programme

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MM: Fachverband Metall- und Materialphysik

MM 26: Nanostructured Materials I

MM 26.2: Talk

Wednesday, March 25, 2009, 10:30–10:45, IFW B

Formation of dendritic metallic nanowires — •Nitesh Ranjan¹, Hartmut Vinzelberg², and Michael Mertig¹ — ¹Institute for Materials Science and Max Bergmann Center of Biomaterials, Dresden University of Technology, D-01062 Dresden, Germany — ²IFW Dresden, P.O. Box 270116, D-01171 Dresden, Germany

Recently, we reported an electrical-field-controlled growth process for the directed bottom-up assembly of one-dimensional palladium nanowires between micro-fabricated electrodes [1]. The wires, grown from an aqueous palladium salt solution by dielectrophoresis, had a thickness of only 5-10 nm and a length of up to several micrometers. The growth process was found to depend largely on the deposition conditions like the strength and the frequency of the applied AC field and the concentration of the metal salt solution. Here, we report the formation of thin, but straight and dendritic metallic nanowires, obtained in the low-frequency regime. The morphology of the wires was characterized by scanning force microscopy (SFM), scanning electron microscopy and transmission electron microscopy. SFM investigations revealed that the palladium nanowires grown over the glass and silicon substrates have a typical thickness of about 25 nm. Room temperature I-V measurements show them to be Ohmic in nature with a resistance of about 80 kOhm. Low-temperature measurements show the phenomenon of zero bias anomaly. The investigated growth method is capable of controllable in-place formation of complex circuit patterns for future nanoelectronics. [1] Nitesh Ranjan, Hartmut Vinzelberg, Michael Mertig, Small 2, 1490 (2006).