Microstructures of Bi-alloy Metal Films by Dealloying

ORAL

Abstract

The objective of this study is to synthesize and characterize different microstructures that are fabricated by dealloying from bi-alloys. With selected chemical etching one element with high etching rate is dissolved and the remaining component may form porous structures. This process is also called as dealloying. The experiments were conducted on three different materials. 6 carat white gold (Au/Ag alloy, 1:3 ratio by weight) leafs that were purchased commercially were etched with 70{\%} HNO$_{3}$ to remove silver. The remaining gold materials congregated to form well connected network structure that was free standing. This Au nanoporous samples had void sizes from a few nanometers to a few hundred nanometers. The second material we studied was the 50/50 solder wire (Pb/Sn alloy). The solder wire was pressed to a thin sheet. The Pb/Sn sheet was etched with 93{\%} H$_{2}$SO$_{4}$. After Sn was dissolved Pb porous structure was formed. In this porous structure, Pb formed crystal-like nanostructures. The third one was Imitation Italian gold leaf (Cu/Zn alloy, 82/18 by wt. {\%}). The leaf was immersed into NaOH solution. By etching out Zn, a free-standing nanoporous Cu film has been formed.

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Authors

  • W.J. Yeh

    University of Idaho

  • Ernest Henley

    Green River College, University of British Columbia, Pacific Northwest National Laboratory, BYU-Idaho Dept. of Physics, University of Washington, Applied Physics Technologies, Inc., Montana State University, Universidade Estadual de Campinas, Southern Oregon University, Oregon State University Department of Physics, Oregon State University Department of Chemistry, National Institute of Standards and Technology Center for Neutron Research, Physics Department, Oregon State University, University of Idaho, University of Wyoming, Department of Physics, Montana State University, University of Portland, Idaho State University, WWU, Advanced Light Source, Lawrence Berkeley National Laboratory, Oregon Center for Optics and Department of Physics, University of Oregon, Lewis and Clark, Queen's University, University of Notre Dame, Idaho National Lab, TRIUMF, RCNP, Japan, University of Guelph, Mexico University, St. Mary's University, University of Montreal, Deep River, Dept. of Physics; Montana State University, Dept. of Plant Sciences and Pathology, Dept. of Chem. and Biochem.; Montana State University, Department of Physics, Shandong University, P. R. China, Department of Physics, University of Idaho, USA, Dept. of Physics, Simon Fraser University, Burnaby, BC V5A 1S6 Canada, University of Calgary

  • Ernest Henley

    Green River College, University of British Columbia, Pacific Northwest National Laboratory, BYU-Idaho Dept. of Physics, University of Washington, Applied Physics Technologies, Inc., Montana State University, Universidade Estadual de Campinas, Southern Oregon University, Oregon State University Department of Physics, Oregon State University Department of Chemistry, National Institute of Standards and Technology Center for Neutron Research, Physics Department, Oregon State University, University of Idaho, University of Wyoming, Department of Physics, Montana State University, University of Portland, Idaho State University, WWU, Advanced Light Source, Lawrence Berkeley National Laboratory, Oregon Center for Optics and Department of Physics, University of Oregon, Lewis and Clark, Queen's University, University of Notre Dame, Idaho National Lab, TRIUMF, RCNP, Japan, University of Guelph, Mexico University, St. Mary's University, University of Montreal, Deep River, Dept. of Physics; Montana State University, Dept. of Plant Sciences and Pathology, Dept. of Chem. and Biochem.; Montana State University, Department of Physics, Shandong University, P. R. China, Department of Physics, University of Idaho, USA, Dept. of Physics, Simon Fraser University, Burnaby, BC V5A 1S6 Canada, University of Calgary