Porous Gold with a Nested-Network Architecture and Ultrafine Structure

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
发表期刊	ADVANCED FUNCTIONAL MATERIALS
ISSN	1616-301X
卷号	25 期号:17 页码:2530-2536
摘要	A 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.
部门归属	[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
资助者	Chinese Scholarship Council; Deutsche Forschungsgemeinschaft [SFB 986]
收录类别	sci
语种	英语
WOS记录号	WOS:000354200000005
引用统计	被引频次：70[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://ir.imr.ac.cn/handle/321006/75061
专题	中国科学院金属研究所
通讯作者	weissmueller@tuhh.de
推荐引用方式 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.