Hydrothermal self-assembly of hierarchical cobalt hyperbranches by a sodium tartrate-assisted route

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	Hydrothermal self-assembly of hierarchical cobalt hyperbranches by a sodium tartrate-assisted route; Hydrothermal self-assembly of hierarchical cobalt hyperbranches by a sodium tartrate-assisted route
	Y. J. Zhang; S. W. Or; Z. D. Zhang
	2011 ; 2011
发表期刊	Rsc Advances ; Rsc Advances
ISSN	2046-2069 ; 2046-2069
卷号	1 期号:7 页码:1287-1293
摘要	Three-dimensional (3D) hierarchical cobalt (Co) hyperbranches are synthesized by a sodium tartrate-assisted hydrothermal self-assembly route. The route includes the fabrication of the Co hyperbranches in a solution of cobalt chloride (CoCl(2)center dot 6H(2)O) and sodium hydroxide (NaOH) at 110 degrees C for 24 h using sodium tartrate (Na(2)C(4)H(4)O(6)center dot 2H(2)O) as the complex reagent and sodium hypophosphite (NaH(2)PO(2)center dot H(2)O) as the reducing agent. Each Co hyperbranch is 50-100 mm in length and consists of a main branch with several secondary branches and leaves. The adjustments of the molar ratio of Na(2)C(4)H(4)O(6) to CoCl(2) and the concentration of NaOH in the solution lead to the formation of the Co products with different morphologies. A possible growth mechanism for the Co hyperbranches is proposed based on the characterization results of X-ray diffraction and scanning electron microscopy. The magnetic hysteresis loops at room temperature of the resulting Co products with different morphologies show ferromagnetic characteristics with high dependence on their sizes and morphologies. An increased coercivity (H(c)) of 231 Oe and a reduced saturation magnetization (M(s)) of 152 emu/g are observed in the Co hyperbranches compared to their bulk counterpart. This relatively simple, efficient, and morphologically controllable route can be applied to the synthesis of complex 3D micro/nanoarchitectures of other materials.; Three-dimensional (3D) hierarchical cobalt (Co) hyperbranches are synthesized by a sodium tartrate-assisted hydrothermal self-assembly route. The route includes the fabrication of the Co hyperbranches in a solution of cobalt chloride (CoCl(2)center dot 6H(2)O) and sodium hydroxide (NaOH) at 110 degrees C for 24 h using sodium tartrate (Na(2)C(4)H(4)O(6)center dot 2H(2)O) as the complex reagent and sodium hypophosphite (NaH(2)PO(2)center dot H(2)O) as the reducing agent. Each Co hyperbranch is 50-100 mm in length and consists of a main branch with several secondary branches and leaves. The adjustments of the molar ratio of Na(2)C(4)H(4)O(6) to CoCl(2) and the concentration of NaOH in the solution lead to the formation of the Co products with different morphologies. A possible growth mechanism for the Co hyperbranches is proposed based on the characterization results of X-ray diffraction and scanning electron microscopy. The magnetic hysteresis loops at room temperature of the resulting Co products with different morphologies show ferromagnetic characteristics with high dependence on their sizes and morphologies. An increased coercivity (H(c)) of 231 Oe and a reduced saturation magnetization (M(s)) of 152 emu/g are observed in the Co hyperbranches compared to their bulk counterpart. This relatively simple, efficient, and morphologically controllable route can be applied to the synthesis of complex 3D micro/nanoarchitectures of other materials.
部门归属	[zhang, yajing; or, siu wing] hong kong polytech univ, dept elect engn, kowloon, hong kong, peoples r china. [zhang, yajing; zhang, zhidong] chinese acad sci, shenyang natl lab mat sci, inst met res, shenyang 110016, peoples r china. [zhang, yajing; zhang, zhidong] chinese acad sci, int ctr mat phys, shenyang 110016, peoples r china.;zhang, yj (reprint author), hong kong polytech univ, dept elect engn, kowloon, hong kong, peoples r china;eeswor@polyu.edu.hk ; [zhang, yajing; or, siu wing] hong kong polytech univ, dept elect engn, kowloon, hong kong, peoples r china. [zhang, yajing; zhang, zhidong] chinese acad sci, shenyang natl lab mat sci, inst met res, shenyang 110016, peoples r china. [zhang, yajing; zhang, zhidong] chinese acad sci, int ctr mat phys, shenyang 110016, peoples r china.;zhang, yj (reprint author), hong kong polytech univ, dept elect engn, kowloon, hong kong, peoples r china;eeswor@polyu.edu.hk
关键词	Gold Nanoparticle Arrays Gold Nanoparticle Arrays One-pot Synthesis One-pot Synthesis Flowerlike Architectures Flowerlike Architectures Inorganic Nanocrystals Inorganic Nanocrystals Magnetic-properties Magnetic-properties Anisotropic Growth Anisotropic Growth Superlattices Superlattices Nickel Nickel Chains Chains Superstructures Superstructures
URL	查看原文 ; 查看原文
WOS记录号	WOS:000296388800020 ; WOS:000296388800020
引用统计	被引频次：23[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/321006/30928
专题	中国科学院金属研究所
推荐引用方式 GB/T 7714	Y. J. Zhang,S. W. Or,Z. D. Zhang. Hydrothermal self-assembly of hierarchical cobalt hyperbranches by a sodium tartrate-assisted route, Hydrothermal self-assembly of hierarchical cobalt hyperbranches by a sodium tartrate-assisted route[J]. Rsc Advances, Rsc Advances,2011, 2011,1, 1(7):1287-1293, 1287-1293.
APA	Y. J. Zhang,S. W. Or,&Z. D. Zhang.(2011).Hydrothermal self-assembly of hierarchical cobalt hyperbranches by a sodium tartrate-assisted route.Rsc Advances,1(7),1287-1293.
MLA	Y. J. Zhang,et al."Hydrothermal self-assembly of hierarchical cobalt hyperbranches by a sodium tartrate-assisted route".Rsc Advances 1.7(2011):1287-1293.