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O: Fachverband Oberflächenphysik

O 19: Nanostructures at surfaces: Arrays

O 19.2: Vortrag

Dienstag, 24. März 2009, 10:45–11:00, SCH A215

UTAM-synthesized large-scale regular arrays of surface patterns of 0-d and 1-d nanostructures — •yong lei, stefan ostendorp, and gerhard wilde — Institut für Materialphysik, Westfälische Wilhelms-Universität Münster, Wilhelm-Klemm-Str. 10, 48149 Münster, Germany

Here we report an UTAM surface nano-patterning fabrication system in synthesizing large-scale regular arrays of 0-D (dots) and 1-D (wires and tubes) surface nanostructures. Different metallic and semiconductor nanodots were fabricated on silicon and sapphire substrates using an ultra-thin alumina membrane (UTAM) as the evaporation mask. The diameter, spacing, shape, and even the crystalline structures of the synthesized surface nano-patterns are adjustable and hence resulting in tunable physical properties of these nano-patterns. A nano-porous silicon oxide surface structure with embedded metallic oxide nano-dots can be realized by oxidizing the metallic nanodots. Using the UTAM-prepared Au nanodots as the catalysts, regular ZnO nanowire arrays were prepared using the CVD process. A unique type of rectangular cross-section ZnO nanowires with a layered structure was also obtained. These layered ZnO nanowires exhibit strong yellow photoluminescence, which is unusual compared to the green photoluminescence of the conventional CVD-prepared ZnO nanowires. The mechanism of this yellow photoluminescence is closely related to the layered structures of the nanowires. These yellow luminescent ZnO nanowires could be used as an excellent component of some optical devices such as flat displays.