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Bulk nested-network nanoporous gold via dealloying
Citation Link: https://doi.org/10.15480/882.1222
Publikationstyp
Doctoral Thesis
Date Issued
2015
Sprache
English
Author(s)
Advisor
Referee
Title Granting Institution
Technische Universität Hamburg
Place of Title Granting Institution
Hamburg
Examination Date
2015-01-07
TORE-DOI
A two-step dealloying strategy has been established via controlled dealloying to fabricate hierarchical nanoporous gold which has two well distinguished levels of ligaments from a bulk solid. Starting out from a dilute solid solution of Au in Ag, controlled electrochemical corrosion yields nanoporous Ag-Au alloy as an intermediate product. Coarsening of the porous alloy creates the large ligaments of the upper hierarchy level. Those are then again dealloyed, which creates the fine ligaments of the lower hierarchy level. The material exhibits enhanced charge transport kinetics while maintaining a large specific surface area. Similar two-step dealloying strategy as the dilute Ag-Au alloy, a Ag-Au-Pt alloy was chosen to fabricate hierarchical nanoporous gold with an ultrafine lower hierarchy level ligament size. The lower hierarchy level ligament size is as small as 6 nm.
Subjects
dealloying
nanoporous metals
hierarchical sturcture
bulk nanomaterial
structure control
DDC Class
620: Ingenieurwissenschaften
More Funding Information
China Scholarship Council (CSC) and Deutsche Forschungsgemeinschaft (SFB 986 'M3' project B2)
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Name
2015_Qi Zhen_Thesis-Final.pdf
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6.17 MB
Format
Adobe PDF