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Selective Adsorption and Growth on Nanostructured Template Surfaces

Project leader: Peter Zeppenfeld

Among the various methods of nanofabrication, self-ordering or self-assembly is a promising pathway to obtain large scale, highly regular nanostructured patterns on surfaces. The driving force for the self-ordering is the competition between short range attractive interactions favoring domain (island) formation and strain induced long range repulsive interactions which render larger domains unstable. As a result, the energetically favored, stable configuration consists of domains with a well defined size arranged in a regular (striped or two-dimensional) pattern. Within the last couple of years, we have studied various examples of surfaces where self-ordering leads to the formation of well ordered nanoscale patterns, such as the one-dimensional (1D, striped) or two-dimensional (2D) domain arrays upon oxygen or nitrogen adsorption on the Cu(110) and Cu(100) surfaces.
We have also developed our expertise with surface optical techniques (reflectance difference spectroscopy, RDS and spectroscopic ellipsometry, SE) and their application to the in-situ and real-time monitoring of self-ordering processes. Both techniques will serve as versatile diagnostic tools, complementing the more traditional surface science techniques (STM, LEED, AES) available in the present project.
Within the second funding period, we will concentrate on using the previously characterized nanostructured surfaces as templates for the subsequent growth of patterned metallic and molecular films and to explore the ensuing specific physical and chemical properties. In particular, the Cu-CuO stripe phase provides an ideal template for the selective adsorption of molecules (methanol, hydrocarbons, water or small organic compounds) due to the strong difference in adsorption energy and adsorption kinetics on the Cu and CuO stripes, respectively. The adsorption and reaction kinetics will be studied in close collaboration with project 6 (Winkler) and the influence of the nanostructuring of the molecular layers on the structure, molecular orientation and other relevant physical or chemical properties of will be explored. On the other hand, the Cu(110)-(2x3)N surface, the carbon induced long range reconstructed W(110) surface and vicinal metal and metal oxide surfaces studied within several other groups of the NFN are well suited for the subsequent nucleation of metal clusters and thin films (Ag, Au, Ni, Fe, Co). The growth of these nanostructures will be studied using diffraction techniques (SPA-LEED, XRD) and STM/AFM. In addition, their electronic, optical and magnetic properties (in the case of Ni, Fe, Co) will be investigated using the optical techniques RDS, RD-MOKE and SE.

This project is funded by the Austrian Science Fund under contract number S90

NSoS  (Neues Fenster)

For more information please contact: Peter Zeppenfeld