Journal
ACS NANO
Volume 6, Issue 5, Pages 3734-3744Publisher
AMER CHEMICAL SOC
DOI: 10.1021/nn300179n
Keywords
nanoporous metals; stacked porous layers charge-induced strain; actuator; sensor
Categories
Funding
- Netherlands Organization for Scientific Research (NWO-the Hague) [017.005.026]
- Zernike Institute for Advanced Materials
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We have synthesized nanoporous Au with a dual microscopic length scale by exploiting the crystal structure of the alloy precursor. The synthesized mesoscopic material is characterized by stacked Au layers of submicrometer thickness. In addition, each layer displays nanoporosity through the entire bulk. It is shown that the thickness of these layers can be tailored via the grain size of the alloy precursor. The two-length-scale structure enhances the functional properties of nanoporous gold, leading to charge-induced strains of amplitude up to 6%, which are roughly 2 orders of magnitude larger than in nanoporous Au with the standard one-length-scale porous morphology. A model is presented to describe these phenomena.
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