Dresden 2009 – wissenschaftliches Programm
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MM: Fachverband Metall- und Materialphysik
MM 1: Topical Session Nanoporous Functional Materials I
MM 1.2: Topical Talk
Montag, 23. März 2009, 10:45–11:15, IFW A
The role of surface chemistry on the properties of nanoporous gold — •Juergen Biener1, Arne Wittstock1,2, Luis A. Zepeda-Ruiz1, Monika M. Biener1, Volker Zielasek2, Domink Kramer3, Raghavan N. Viswanath3, Joerg Weissmüller3, Marcus Baeumer2, and Alex V. Hamza1 — 1Nanoscale Synthesis and Characterization Laboratory, Lawrence Livermore National Laboratory, USA — 2Institut für Angewandte und Physikalische Chemie, Universität Bremen, Germany — 3Institut für Nanotechnologie, Forschungszentrum Karlsruhe, Germany
Although surfaces or, more precisely, surface atoms determine the way how materials interact with their environment, the influence of surface chemistry on the bulk of the material is generally considered to be small. However, in the case of high surface area materials such as nanoporous gold the influence of surface properties can no longer be neglected. Therefore, actively controlling surface properties such as diffusion barriers and surface stress by surface chemistry should provide an opportunity to manipulate and fine-tune material properties. Specifically, we will show that surface chemistry is an important factor in determining the stability of nanostructured gold surfaces, and that macroscopic strain can be generated by surface-chemistry induced changes of the surface stress. The latter effect can be used to directly convert chemical energy into a mechanical response without generating heat or electricity first and thus opens the door to surface-chemistry driven actuator and sensor technologies. Prepared by LLNL under Contract DE-AC52-07NA27344.