SKM 2023 – wissenschaftliches Programm

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MM: Fachverband Metall- und Materialphysik

MM 23: Poster II

MM 23.24: Poster

Dienstag, 28. März 2023, 18:15–20:00, P2/OG1+2

Mechanical actuation of nanoporous metal driven by electroactive self-assembled monolayers — •Matts Olga and Mameka Nadiia — Helmholtz-Zentrum Hereon, Geesthacht, Germany

Nanoporous (np) metals fabricated by alloy corrosion are emerging as promising functional materials for (bio-)chemical sensing and actuation. The actuation with np metals exploits the electrocapillary phenomena of metal surfaces, in which surface stress responses to changes of the surface state (e.g. due to adsorption). As the surface stress is coupled with stresses of opposite sigh in the metal bulk [1], its variations manifest themselves through macroscopic movements of the entire solid [2].

Due to high surface area, surface-functionalized np metals offer an ideal platform for highly sensitive sensing and actuation technologies. Here, were report reversible electroactuation of unimodal and hierarchical np-Au modified with an electroactive ferrocene-terminated self-assembled monolayer (SAM). In our experiment utilizing in situ dilatometry in electrolyte, an electrode potential is imposed on np-Au modulates redox transformations of SAM by oxidation and reduction of the ferrocene moiety. We find pronounced actuation strain variations that accompany the monolayer structural transformations triggered by potential. We discuss an origin of the phenomena in view of surface stress change of gold surfaces functionalized with the redox-active SAM. [1] Weissmüller, Cahn. Acta Mater. 45(5) 1899 (1997). [2] Kramer, et al. Nano Lett. 4(5) 793 (2004).