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 fact, dilatometry experiments find electrochemical actuation with large reversible strain amplitude. The linear strain reaches approximately 1.3% and strain energy density is up to 6.0 MJ/m(3). The associated stresses may approach the elastic limit of the alloy.
Jin
Hai-Jun
HJ
Karlsruher Institut fur Technologie, Institut fur Nanotechnologie, Karlsruhe, Germany. haijun.jin@kit.edu
Wang
Xiao-Lan
XL
Parida
Smrutiranjan
S
Wang
Ke
K
Seo
Masahiro
M
Weissmüller
Jörg
J
D000497:Alloys / Q000737:chemistry*; D004548:Elasticity; D004563:Electrochemistry / Q000379:methods*; D006046:Gold / Q000737:chemistry*; D008422:Materials Testing; D053768:Metal Nanoparticles / Q000737:chemistry*; D036103:Nanotechnology / Q000379:methods; D010984:Platinum / Q000737:chemistry*; D013499:Surface Properties; D013718:Tensile Strength
D000497:Alloys; D010984:Platinum; D006046:Gold