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Title: Mechanical properties of nanoporous gold in tension

Authors:
; ;
Publication Date:
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
OSTI Identifier:
1419114
Grant/Contract Number:
SC0008677
Resource Type:
Journal Article: Publisher's Accepted Manuscript
Journal Name:
Acta Materialia
Additional Journal Information:
Journal Volume: 129; Journal Issue: C; Related Information: CHORUS Timestamp: 2018-02-01 14:41:24; Journal ID: ISSN 1359-6454
Publisher:
Elsevier
Country of Publication:
United States
Language:
English

Citation Formats

Badwe, Nilesh, Chen, Xiying, and Sieradzki, Karl. Mechanical properties of nanoporous gold in tension. United States: N. p., 2017. Web. doi:10.1016/j.actamat.2017.02.040.
Badwe, Nilesh, Chen, Xiying, & Sieradzki, Karl. Mechanical properties of nanoporous gold in tension. United States. doi:10.1016/j.actamat.2017.02.040.
Badwe, Nilesh, Chen, Xiying, and Sieradzki, Karl. 2017. "Mechanical properties of nanoporous gold in tension". United States. doi:10.1016/j.actamat.2017.02.040.
@article{osti_1419114,
title = {Mechanical properties of nanoporous gold in tension},
author = {Badwe, Nilesh and Chen, Xiying and Sieradzki, Karl},
abstractNote = {},
doi = {10.1016/j.actamat.2017.02.040},
journal = {Acta Materialia},
number = C,
volume = 129,
place = {United States},
year = 2017,
month = 5
}

Journal Article:
Free Publicly Available Full Text
This content will become publicly available on March 9, 2018
Publisher's Accepted Manuscript

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  • Nanoporous metals have many technologically promising applications but their tendency to coarsen limits their long-term stability and excludes high temperature applications. Here, we demonstrate that atomic layer deposition (ALD) can be used to stabilize and functionalize nanoporous metals. Specifically, we studied the effect of nanometer-thick alumina and titania ALD films on thermal stability, mechanical properties, and catalytic activity of nanoporous gold (np-Au). Our results demonstrate that even only one-nm-thick oxide films can stabilize the nanoscale morphology of np-Au up to 1000 C, while simultaneously making the material stronger and stiffer. The catalytic activity of np-Au can be drastically increased bymore » TiO{sub 2} ALD coatings. Our results open the door to high temperature sensor, actuator, and catalysis applications and functionalized electrodes for energy storage and harvesting applications.« less
  • It has recently been shown that due to a high surface-to-volume ratio, nanoporous materials display radiation tolerance. The abundance of surfaces, which are perfect sinks for defects, and the relation between ligament size, defect diffusion, and time combine to define a window of radiation resistance [Fu et al., Appl. Phys. Lett. 101, 191607 (2012)]. Outside this window, the dominant defect created by irradiation in Au nanofoams are stacking fault tetrahedra (SFT). Molecular dynamics computer simulations of nanopillars, taken as the elemental constituent of foams, predict that SFTs act as dislocation sources inducing softening, in contrast to the usual behavior inmore » bulk materials, where defects are obstacles to dislocation motion, producing hardening. In this work we test that prediction and answer the question whether irradiation actually hardens or softens a nanofam. Ne ion irradiations of gold nanofoams were performed at room temperature for a total dose up to 4 dpa, and their mechanical behavior was measured by nanoindentation. We find that hardness increases after irradiation, a result that we analyze in terms of the role of SFTs on the deformation mode of foams.« less