Controlled nanoporous Pt morphologies by varying deposition parameters

Antonia Antoniou; Dhriti Bhattacharrya; J. Kevin Baldwin; Peter Goodwin; Michael Nastasi; S. T. Picraux; Amit Misra

doi:10.1063/1.3194109

Controlled nanoporous Pt morphologies by varying deposition parameters

Antonia Antoniou
, Dhriti Bhattacharrya
, J. Kevin Baldwin
, Peter Goodwin
, Michael Nastasi
, S. T. Picraux
, Amit Misra

Los Alamos National Laboratory

Research output: Contribution to journal › Article › peer-review

23 Scopus citations

Abstract

We synthesize nanoporous platinum (np-Pt) through electrochemical dealloying in aqueous HF from cosputtered Pt_xSi_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 μm 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.

Original language	English
Article number	073116
Journal	Applied Physics Letters
Volume	95
Issue number	7
DOIs	https://doi.org/10.1063/1.3194109
State	Published - Sep 1 2009

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title = "Controlled nanoporous Pt morphologies by varying deposition parameters",

abstract = "We synthesize nanoporous platinum (np-Pt) through electrochemical dealloying in aqueous HF from cosputtered PtxSi1-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 μm 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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AU - Antoniou, Antonia

AU - Bhattacharrya, Dhriti

AU - Baldwin, J. Kevin

AU - Goodwin, Peter

AU - Nastasi, Michael

AU - Picraux, S. T.

AU - Misra, Amit

PY - 2009/9/1

Y1 - 2009/9/1

N2 - We synthesize nanoporous platinum (np-Pt) through electrochemical dealloying in aqueous HF from cosputtered PtxSi1-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 μm 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.

AB - We synthesize nanoporous platinum (np-Pt) through electrochemical dealloying in aqueous HF from cosputtered PtxSi1-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 μm 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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SN - 0003-6951

VL - 95

JO - Applied Physics Letters

JF - Applied Physics Letters

IS - 7

M1 - 073116

ER -

Controlled nanoporous Pt morphologies by varying deposition parameters

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