Regensburg 2016 – wissenschaftliches Programm
Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe
MM: Fachverband Metall- und Materialphysik
MM 5: Nanomaterials I: Mechanics
MM 5.4: Vortrag
Montag, 7. März 2016, 11:00–11:15, H53
Exploiting Electrocapillary Coupling at Metal Surfaces for Active Strain Sensing with Nanoporous Gold — •Charlotte Stenner1, Lihua Shao2, Nadiia Mameka3, and Jörg Weissmüller1,3 — 1Institute of Materials Physics and Technology, Hamburg University of Technology, Germany — 2Beijing Institute of Nanoenergy and Nanoscience, Chinese Academy of Sciences, China — 3Institute of Materials Research, Materials Mechanics, Helmholtz-Zentrum Geesthacht, Germany
We investigate nanoporous gold (NPG) imbibed with electrolyte as a hybrid material, in which the metal acts as an electrode. Due to the large surface-to-volume ratio of NPG the properties of the hybrid material are particularly determined by the metal-electrolyte interface.
An applied strain on NPG is expected to cause measurable potential variations, since the impact of mechanical deformation of a planar gold electrode on its potential is large [1]. Our experiments demonstrate that NPG can be used for sensing elastic strain via measuring either current or potential response of the electrode. The electrochemical signals generated by cyclic straining are robust and sensitive, their magnitude increases with increasing strain amplitude. To connect strain-sensing and actuation measurements on the NPG-based hybrid material, we introduce a theoretical strain-sensing actuation relation that leads to excellent agreement with the experimental results. Thus, one can make predictions about sensing properties using effective actuation parameters and vice versa.
[1] M. Smetanin, Q. Deng and J. Weissmüller, PCCP 13 (2011) 17313