Berlin 2015 – wissenschaftliches Programm
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MM: Fachverband Metall- und Materialphysik
MM 16: Functional materials III: Sensors and Actuators
MM 16.2: Vortrag
Montag, 16. März 2015, 16:00–16:15, TC 010
Nanoporous gold as strain-sensing material — •Charlotte Stenner1, Lihua Shao1,2, Nadiia Mameka3, and Jörg Weissmüller1,3 — 1Institute of Materials Physics and Technology, Hamburg University of Technology, Hamburg, Germany — 2Beijing Institute of Nanoenergy and Nanoscience, Chinese Academy of Sciences, Beijing, China — 3Institute of Materials Research, Materials Mechanics, Helmholtz-Zentrum Geesthacht, Geesthacht, Germany
Due to a large surface-to-volume ratio, nanoporous metals are predestined for exploiting their surface properties in schemes for novel functional materials. Here, we report an electrochemical sensor based on nanoporous gold (npg) for strain detection. Npg imbibed with electrolyte was inspected as a hybrid material, in which the metal acted as an electrode. Since the mechanical deformation of a planar gold electrode has a strong impact on its potential E [1], an applied strain is expected to cause potential variations that can be measured in npg.
In our experiments, macroscopic bulk samples of npg are cyclically strained in a dynamical mechanical analyzer (DMA). The material shows a robust and sensitive response of the potential to cyclic variation of strain. With higher strain amplitude and smaller pore size, the potential response is increased. Additionally, another strategy was employed, where a charge variation was measured at constant potential. Via this method the electrochemical signals were obtained in different potential regimes, as the double-layer and oxygen-adsorption region. [1] M. Smetanin, et al., Phys. Chem. Chem. Phys. 13 (2011) 17313