Nanoporous Au−Pt Alloys As Large Strain Electrochemical Actuators

Nanoporous Au−Pt alloys with pore- and ligament size down to few nanometers were fabricated by dealloying Ag−Au−Pt. Owing to the small structure size and large specific surface area, the surface stress and its variation give rise to significant stress and strain in the bulk of these materials. In fa...

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Bibliographic Details
Published in:Nano letters 2010-01, Vol.10 (1), p.187-194
Main Authors: Jin, Hai-Jun, Wang, Xiao-Lan, Parida, Smrutiranjan, Wang, Ke, Seo, Masahiro, Weissmüller, Jörg
Format: Article
Language:English
Subjects:
Alloys - chemistry
Condensed matter: structure, mechanical and thermal properties
Elasticity
Electrochemistry - methods
Exact sciences and technology
Gold - chemistry
Low-dimensional structures (superlattices, quantum well structures, multilayers): structure, and nonelectronic properties
Materials Testing
Mechanical and acoustical properties of condensed matter
Mechanical properties of nanoscale materials
Metal Nanoparticles - chemistry
Nanotechnology - methods
Physics
Platinum - chemistry
Surface Properties
Surfaces and interfaces
thin films and whiskers (structure and nonelectronic properties)
Tensile Strength
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Summary:Nanoporous Au−Pt alloys with pore- and ligament size down to few nanometers were fabricated by dealloying Ag−Au−Pt. Owing to the small structure size and large specific surface area, the surface stress and its variation give rise to significant stress and strain in the bulk of these materials. In fact, dilatometry experiments find electrochemical actuation with large reversible strain amplitude. The linear strain reaches ∼1.3% and strain energy density is up to 6.0 MJ/m3. The associated stresses may approach the elastic limit of the alloy.
ISSN:1530-6984
1530-6992
DOI:10.1021/nl903262b