Publisher DOI: 10.1016/j.actamat.2021.116852
Title: Nanoporous gold-polypyrrole hybrid electrochemical actuators with tunable elasticity
Language: English
Authors: Li, Jie 
Markmann, Jürgen 
Weissmüller, Jörg 
Mameka, Nadiia 
Keywords: Actuation; Dealloying; Dynamic mechanical analysis; Nanoporous; Polypyrrole
Issue Date: 15-Jun-2021
Source: Acta Materialia 212: 116852 (2021-06-15)
Abstract (english): 
This study explores the effective elastic response of hybrid electrochemical actuators based on nanoporous gold – decorated with a thin film of an electrosynthesized polypyrrole – during charging in an aqueous electrolyte. We found a new and yet unrevealed phenomenon in the hybrids – a reversible change of the material's elasticity with alternating stiffening and softening behavior. Remarkably, the stiffness variations are larger and of opposite sign as compared to a non-coated nanoporous gold. The amplitude of the elastic modulus variation increases with the thickness of the polypyrrole layer, pointing to a dominant role of processes in the polymer bulk upon its doping or undoping. We propose that the reversible stiffness of the hybrid material is governed by the competition between the increased intermolecular bonding as consequence of interactions between the charged chains and dopant anions in the polymer and its plasticization due to solvent intake.
ISSN: 1359-6454
Journal: Acta materialia 
Institute: Werkstoffphysik und -technologie M-22 
Document Type: Article
Project: SFB 986: Teilprojekt B10 - Funktionalisierung von hierarchischen nanoporösen Metallen durch aktive organische Filme 
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