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Mitigation of tensile failure in released nanoporous metal microstructures via thermal treatment
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View: Figures


Image of FIG. 1.
FIG. 1.

(Color online) Illustration of microfabrication method for freestanding np-Au bridge. (a) Schematic layout of a microfabricated Au–Ag alloy bridge with Al film underneath as a sacrificial layer. The bridge is secured by clamping films. (b) Release the bridge by successively etching the Al, SiO2, and Si. (c) Anneal at for to induce thermal buckling. (d) Dealloy in nitric acid to create a flat freestanding np-Au bridge; remove rinse water by critical point drying.

Image of FIG. 2.
FIG. 2.

(a) Scanning electron microscope (SEM) images of a np-Au bridge ruptured after dealloying. (b) Pronounced necking is observed at np-Au ligament breakage.

Image of FIG. 3.
FIG. 3.

Comparison of plastic thermal buckling in Au–Ag bridges and np-Au bridges after dealloying. (a) SEM image (59° tilt) of Au–Ag bridges after rapid thermal annealing at . (b) SEM (59° tilt) of the same bridges after dealloying in concentrated nitric acid. (c) SEM showing the nanoporous morphology of the np-Au bridge. [The scale bars in (a) and (b) are long.]

Image of FIG. 4.
FIG. 4.

Focused ion beam (FIB) images of np-Au cantilevers created by FIB milling of a doubly clamped np-Au bridge. (a) Top view. (b) 20° tilt view.


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Mitigation of tensile failure in released nanoporous metal microstructures via thermal treatment