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Publisher DOI: 10.1002/adfm.201600938
Title: Piezoelectric gold : strong charge-load response in a metal-based hybrid nanomaterial
Language: English
Authors: Stenner, Charlotte 
Shao, Li-Hua 
Mameka, Nadiia 
Weissmüller, Jörg 
Keywords: actuation;dealloying;electrocapillarity;nanoporous metal;sensing
Issue Date: 8-Jun-2016
Publisher: Wiley
Source: Advanced functional materials 28 (26) : 5174-5181 (2016)
Journal or Series Name: Advanced functional materials 
Abstract (english): Impregnating the pores of nanoporous gold with aqueous electrolyte yields a hybrid nanomaterial with two separate and interpenetrating charge transport paths, electronic conduction in the metal and ionic conduction in the electrolyte. As the two paths are capacitively connected, space‐charge layers along the internal interfaces are coupled to electric potential differences between the paths and can be controlled or detected thereby. The present experiments show that the space charge couples to mechanical deformation of the hybrid material, so that external loading generates an electric current. The electric signal originates from charge displacement along the entire internal interface; the signal is particularly robust since the interface area is large. The charge transfer in response to load constitutes a piezoelectric response, yet the mechanism is quite different to classic piezoelectricity. The analysis in this work predicts links between electromechanical coupling parameters for strain sensing and actuation, which are in excellent agreement with the experiment.
DOI: 10.15480/882.1727
ISSN: 1616-3028
Institute: Werkstoffphysik und -technologie M-22 
Type: (wissenschaftlicher) Artikel
Funded by: DFG
Project: SFB 986: Teilprojekt B2 - Feste und leichte Hybridwerkstoffe auf Basis nanoporöser Metalle 
License: In Copyright In Copyright
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