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Enhanced Strain in Functional Nanoporous Gold with a Dual Microscopic Length Scale Structure

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Department of Applied Physics, Zernike institute for Advanced Materials and Materials Innovation Institute M2i, University of Groningen, Nijenborgh 4, 9747 AG Groningen, The Netherlands
*Address correspondence to [email protected]
Cite this: ACS Nano 2012, 6, 5, 3734–3744
Publication Date (Web):March 31, 2012
https://doi.org/10.1021/nn300179n
Copyright © 2012 American Chemical Society
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Abstract

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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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Synthesis of the master alloys; increase in the specific surface area and its consequence for the giant strains; Figure S1 with a schematic illustration of the setup for strain measurements; Figure S2 illustrating the deformation modes in nanoporous Au with and without a layered structure. This material is available free of charge via the Internet at http://pubs.acs.org.

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