IMR OpenIR
Porous Gold with a Nested-Network Architecture and Ultrafine Structure
Qi, Zhen; Vainio, Ulla; Kornowski, Andreas; Ritter, Martin; Weller, Horst; Jin, Haijun; Weissmueller, Joerg; weissmueller@tuhh.de
2015
Source PublicationADVANCED FUNCTIONAL MATERIALS
ISSN1616-301X
Volume25Issue:17Pages:2530-2536
AbstractA preparation strategy is developed for monolithic samples of nanoporous gold with a hierarchical structure comprising two nested networks of solid "ligaments" on distinctly different structural length scales. The electrochemical dealloying protocol achieves a large retention of less noble element in a first corrosion step, thereby allowing an extra corrosion step which forms a separate structural hierarchy level. The beneficial impact of adding Pt to the Ag-Au master alloys that are more conventionally used in dealloying approaches to nanoporous gold is demonstrated. At approximate to 6 nm, the lower hierarchy level ligament size emerges extremely small. Furthermore, Pt favors the retention of Ag during the first dealloying step even when the master alloy has a high Au content. The high Au content reduces the corrosion-induced shrinkage, mitigating crack formation during preparation and favoring the formation of high-quality macroscopic (mm-sized) samples. The corrosion effectively carves out the nanoscale hierarchical ligament structure from the parent crystals tens of micrometers in size. This is revealed by X-ray as well as electron backscatter diffraction, which shows that the porous crystallites inherit the highly ordered, macroscopic crystal lattice structure of the master alloy.
description.department[qi, zhen ; weissmueller, joerg] hamburg univ technol, inst mat phys, d-21073 hamburg, germany ; [vainio, ulla] helmholtz zentrum geesthacht, inst mat res, mat phys, d-21502 geesthacht, germany ; [kornowski, andreas ; weller, horst] univ hamburg, inst phys chem, d-20146 hamburg, germany ; [ritter, martin] hamburg univ technol, electron microscopy unit, d-21073 hamburg, germany ; [jin, haijun] chinese acad sci, inst met res, shenyang natl lab mat sci, shenyang 110016, peoples r china ; [weissmueller, joerg] helmholtz zentrum geesthacht, inst mat res, mat mech, d-21502 geesthacht, germany
Funding OrganizationChinese Scholarship Council; Deutsche Forschungsgemeinschaft [SFB 986]
Indexed Bysci
Language英语
Document Type期刊论文
Identifierhttp://ir.imr.ac.cn/handle/321006/75061
Collection中国科学院金属研究所
Corresponding Authorweissmueller@tuhh.de
Recommended Citation
GB/T 7714
Qi, Zhen,Vainio, Ulla,Kornowski, Andreas,et al. Porous Gold with a Nested-Network Architecture and Ultrafine Structure[J]. ADVANCED FUNCTIONAL MATERIALS,2015,25(17):2530-2536.
APA Qi, Zhen.,Vainio, Ulla.,Kornowski, Andreas.,Ritter, Martin.,Weller, Horst.,...&weissmueller@tuhh.de.(2015).Porous Gold with a Nested-Network Architecture and Ultrafine Structure.ADVANCED FUNCTIONAL MATERIALS,25(17),2530-2536.
MLA Qi, Zhen,et al."Porous Gold with a Nested-Network Architecture and Ultrafine Structure".ADVANCED FUNCTIONAL MATERIALS 25.17(2015):2530-2536.
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