A Hydrothermal Reduction Route to Single‐Crystalline Hexagonal Cobalt Nanowires

Xie, By‐Qin; Qian, Yitai; Zhang, Shuyuan; Fu, Shenquan; Yu, Wenxin

doi:10.1002/ejic.200600061

Cited by 110 publications

(63 citation statements)

References 36 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…When sodium citrate was added into the reaction systems, the reductive ability of ethylene glycol was restricted and the yield decreased dramatically until the yield was zero when the molar ratio of sodium citrate to cobalt chloride was four. However, while sodium citrate was added in the reaction systems with sodium formate as the reducing agent, the yield was kept high, though slightly decreased with the amount of sodium citrate increased, which indicates that sodium citrate restrained the reduction reaction of cobalt chloride as citrate ions could coordinate with cobalt ions to form [Co(C 6 H 5 O 7 ) 2 ] 4-complexes [9]. According to thermodynamics point of view, the formation of the complex reduced Co(II) redox potential resulted in a yield decreased.…”

Section: Resultsmentioning

confidence: 92%

Effect of sodium citrate on preparation of nano-sized cobalt particles by organic colloidal process

Zhu

Song

et al. 2009

Front. Chem. China

View full text Add to dashboard Cite

Nano-sized cobalt particles with the diameter of 2 nm were prepared via an organic colloidal process with sodium formate, ethylene glycol and sodium citrate as the reducing agent, the solvent and the complexing agent, respectively. The effects of sodium citrate on the yield, crystal structure, particle size and size distribution of the prepared nano-sized cobalt particles were then investigated. The results show that the average particle diameter decreases from 200 nm to 2 nm when the molar ratio of sodium citrate to cobalt chloride changes from 0 to 6. Furthermore, sodium citrate plays a crucial role in the controlling of size distribution of the nano-sized particles. The size distribution of the particle without sodium citrate addition is in range from tens of nanometers to 300 or 400 nm, while that with sodium citrate addition is limited in the range of (2AE0.25) nm. Moreover, it is found that the addition of sodium citrate as a complex agent could decrease the yield of the nano-sized cobalt particle.

show abstract

Section: Resultsmentioning

confidence: 92%

Effect of sodium citrate on preparation of nano-sized cobalt particles by organic colloidal process

Zhu

Song

et al. 2009

Front. Chem. China

View full text Add to dashboard Cite

show abstract

“…Among the three hybrid MFs, Au/ Co MF showed a maximum saturation magnetization of 70.5 emu g -1 , which is much lower than that for the reported bulk Co metal (168.0 emu g -1 ). 21 Even after correcting for the masses of Au, C, and O in the MF using the EDAX percentage, the magnetism appears to be low (∼91 emu/g), indicating the nanoscale effect. As seen in TEM, the constituent particles are much smaller in size.…”

Section: Bmentioning

confidence: 99%

Magnetic Mesoflowers: Synthesis, Assembly, and Magnetic Properties

Panikkanvalappil

Pradeep

2010

J. Phys. Chem. C

View full text Add to dashboard Cite

An efficient method to introduce magnetic attributes to highly complex Au mesostructures by overlayer growth is demonstrated. The overlayer is nanostructured in all the cases investigated. A possible mechanism for the reduction of ions on the surface of Au mesoflowers and the consequent formation of hybrid mesoflowers is discussed. We studied the magnetic hysteresis behavior of Au/Ni, Au/Co, and Au/Pt/Ni mesoflowers at room temperature. Compared to the bulk metals, a decrease in saturation magnetization was observed in all the three hybrid magnetic mesoflowers, which may be due to the nanoscale structure. Assemblies of various magnetic mesoflowers extending over hundreds of micrometers on indium tin oxide (ITO) substrates have been made by magnetic field-induced self-assembly. Particles are assembled to form elongated chains, oriented parallel to the direction of the applied magnetic field.

show abstract

“…Because the multiple crystal structures [such as hexagonal-close-packed (hcp), face-centered-cubic (fcc), and ε-phase] [10] and morphologies of cobalt have a significant influence on its properties, there has been an increasing number of reports on the synthesis of cobalt with various shapes. Nanorods, micro-/nanowires, nanofibers, nanobelts, nanotubes, nanorings, nanodisks/nanoplatelets, [11][12][13][14][15] two-and three-dimensional superlattices, and chain-like structures [16] have been successfully synthesized. In this contribution, not only do we study the transformation of morphologies, but we also focus attention on an intergrade from single-crystal to polycrystalline hierarchical structures synthesized by the solvothermal method.…”

Section: Introductionmentioning

confidence: 99%

Synthesis and Characterization of Metallic Co with Different Hierarchical Structures Prepared by a Simple Solvothermal Method

2010

View full text Add to dashboard Cite

Magnetic metallic cobalt with different hierarchical structures, such as dendritic particles, flowery particles, and flocky spheres, has been successfully prepared by using a simple solvothermal process in which the relative amounts of H 2 C 2 O 4 and N 2 H 4 ·H 2 O in the reaction system were rationally adjusted. The Co crystals with hierarchical structure had a hexagonal-close-packed (hcp) structure. The dendritic Co crystal comprises several 1-5 µm long dendrites, and the hierarchical assemblies radiate from the center. The flowerlike Co submicrocrystals are composed of petal-like crystals

show abstract

A Hydrothermal Reduction Route to Single‐Crystalline Hexagonal Cobalt Nanowires

Cited by 110 publications

References 36 publications

Effect of sodium citrate on preparation of nano-sized cobalt particles by organic colloidal process

Effect of sodium citrate on preparation of nano-sized cobalt particles by organic colloidal process

Magnetic Mesoflowers: Synthesis, Assembly, and Magnetic Properties

Synthesis and Characterization of Metallic Co with Different Hierarchical Structures Prepared by a Simple Solvothermal Method

Contact Info

Product

Resources

About