Controlled nanoporous Pt morphologies by varying deposition parameters Academic Article uri icon

abstract

  • We synthesize nanoporous platinum (np-Pt) through electrochemical dealloying in aqueous HF from cosputtered PtxSi1x 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 1m 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.

published proceedings

  • Applied Physics Letters

author list (cited authors)

  • Antoniou, A., Bhattacharrya, D., Baldwin, J. K., Goodwin, P., Nastasi, M., Picraux, S. T., & Misra, A.

citation count

  • 27

publication date

  • August 2009