Journal
APPLIED PHYSICS LETTERS
Volume 95, Issue 7, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.3194109
Keywords
amorphous state; electrochemistry; foams; grain size; nanoporous materials; nanotechnology; platinum; platinum alloys; silicon alloys; sputter deposition; thin films
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Funding
- Center for Integrated Nanotechnologies
- U.S. Department of Energy, Office of Basic Energy Sciences user facility at Los Alamos National Laboratory [DE-AC52-06NA25396]
- Sandia National Laboratories [DE-AC04-94AL85000]
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We synthesize nanoporous platinum (np-Pt) through electrochemical dealloying in aqueous HF from cosputtered Pt(x)Si(1-x) amorphous films for different initial composition and sputter bias conditions. We demonstrate that, in addition to the expected isotropic open cell np-Pt foam, anisotropic (columnar and Voronoi) np-Pt is obtained. There are two levels of anisotropy: on the micron scale, 100 nm columns or 1 mu m Voronoi polygons form. Inside the columnar and Voronoi hyperstructures, the ligaments and pores are anisotropic ranging from 5 to 25 nm. The ligament diameter and grain size is 5 nm for all reported structures. A processing-structure map is developed that correlate np-Pt structures to processing conditions.
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