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Preparation and Characterization of Ring-Shaped Co Nanomaterials
Guo, L; Liang, F; Wang, N; Kong, DS; Wang, SM; He, L; Chen, CP; Meng, XM; Wu, ZY; Wu ZY(吴自玉)
Corresponding Author[Guo, Lin ; Liang, Fang ; Wang, Ning] Beijing Univ Aeronaut & Astronaut, Sch Chem & Environm, Beijing 100083, Peoples R China ; [Kong, Desheng ; Wang, Siming ; He, Lin ; Chen, Chinping] Peking Univ, Dept Phys, Beijing 100871, Peoples R China ; [Meng, Xiangmin] Chinese Acad Sci, Lab Optoelect Funct Mat & Mol Engn, Beijing 100080, Peoples R China ; [Meng, Xiangmin] Chinese Acad Sci, Tech Inst Phys & Chem, Beijing 100080, Peoples R China ; [Wu, Ziyu] Chinese Acad Sci, Inst High Energy Phys, Beijing 100039, Peoples R China
AbstractDonut- or ring-shaped Co nanomaterials were successfully synthesized using the polymer-modified method, by which PVP is used as a surface modifier reagent. The synthesized products were structurally and morphologically characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), and transmission electron microscopy (TEM), whereas the magnetic characterization was performed by temperature- and field-dependent magnetization measurements. The results show that the rings have a h-Co nanostructure. The outer diameter is about 400-500 nm, inner diameter 150-250 nm, and the ring plane thickness similar to 120 nm. The magnetization measurements show a typical coercivity of about 112 Oe at 300 K and an almost vanishing coercivity, H-C approximate to 0 at T = 5 K. Numerical calculations using the packeage of object oriented micromagnetic framework (OOMMF) reveal a magnetization ground-state of flux closure structure, as expected for the geometric structure of the submicrometer-sized Co rings. This explains the observed hysteresis loops at low temperature with a vanishing small coercivity. A possible reaction process for the formation of the donut-shaped Co nanostructure is presented.
Subject AreaChemistry; Materials Science
WOS Research AreaChemistry ; Materials Science
WOS SubjectChemistry, Physical ; Materials Science, Multidisciplinary
WOS IDWOS:000258580500010
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Cited Times:30[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
First Author AffilicationInstitute of High Energy
Recommended Citation
GB/T 7714
Guo, L,Liang, F,Wang, N,et al. Preparation and Characterization of Ring-Shaped Co Nanomaterials[J]. CHEMISTRY OF MATERIALS,2008,20(16):5163-5168.
APA Guo, L.,Liang, F.,Wang, N.,Kong, DS.,Wang, SM.,...&吴自玉.(2008).Preparation and Characterization of Ring-Shaped Co Nanomaterials.CHEMISTRY OF MATERIALS,20(16),5163-5168.
MLA Guo, L,et al."Preparation and Characterization of Ring-Shaped Co Nanomaterials".CHEMISTRY OF MATERIALS 20.16(2008):5163-5168.
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