Controlled nanoporous Pt morphologies by varying deposition parameters
- Department of Mechanical Engineering, Georgia Institute of Technology, Atlanta, Georgia 30332 (United States)
- Center for Integrated Nanotechnologies, Los Alamos National Laboratory, Los Alamos, New Mexico 87545 (United States)
We synthesize nanoporous platinum (np-Pt) through electrochemical dealloying in aqueous HF from cosputtered Pt{sub x}Si{sub 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.
- OSTI ID:
- 21294267
- Journal Information:
- Applied Physics Letters, Vol. 95, Issue 7; Other Information: DOI: 10.1063/1.3194109; (c) 2009 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); ISSN 0003-6951
- Country of Publication:
- United States
- Language:
- English
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