Fractal growth of single-crystal α-Fe2O3: From dendritic micro-pines to hexagonal micro-snowflakes

He, Kai; Xu, Cheng‐Yan; Shao, Wen

doi:10.1016/j.matlet.2007.06.082

Cited by 44 publications

(27 citation statements)

References 15 publications

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“…According to the reported literature, different morphologies of a-Fe 2 O 3 , such as nanorods [7], nanocubics [8], airplanelike [9] and shuttle-like structures [10], micro-snowflakes and dendritic micro-pines [11], have been successfully obtained. Usually, using the Fe 3?…”

Section: Introductionmentioning

confidence: 99%

“…Usually, using the Fe 3? solution, a-Fe 2 O 3 with different morphologies were synthesized directly by a hydrothermal method in the presence of a surfactant [10][11][12], or synthesized by calcining or annealing the precursors, such as a-FeOOH or b-FeOOH obtained by a hydrothermal method [7,13]. Another method to control hematite morphology is the template-free method.…”

Section: Introductionmentioning

confidence: 99%

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Preparation of nanoparticles and hollow spheres of α-Fe2O3 and their properties

2011

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Uniform nanoparticles and hollow microspheres of hematite (a-Fe 2 O 3 ) were obtained via a hydrothermal method by using iron (III) chloride as a precursor. The effects of reactant concentration, reaction time and temperature on the morphology of the samples were studied. The samples were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FTIR) and superconducting quantum interference device magnetometer (SQUID) measurement. a-Fe 2 O 3 nanoparticles show a superparamagnetic behavior and the average size of the spherical particles was around 60 nm. However, hollow microspheres show a normal ferromagnetic behavior at room temperature with remanent magnetization and coercivity of 0.2482 emu/g and 2,516 Oe, respectively, and their average diameter was around 2 lm. The effects of reactant concentration and reaction temperature on the formation of the products were investigated. The experimental results reveal that the magnetic properties of hematite can be tuned by controlling the morphology.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Preparation of nanoparticles and hollow spheres of α-Fe2O3 and their properties

2011

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“…Therefore, much effort has been devoted to the controlled growth of materials with different dimensions. Up to now, various forms of three-dimensional (3-D) metal, metal oxide and metal chalcogenide structures such as multipods [6], snowflakes [7,8], hyperbranches [9], and dendrites [10,11] have been synthesized by different techniques including MOCVD [12], hydrothermal [13][14][15][16], solution chemical [17,18] and electrochemical deposition [19,20]. Among these methods, chemical solution method is one of the most promising methods due to its simplicity, low temperature, easy control and large scale.…”

Section: Introductionmentioning

confidence: 99%

Electroless deposition of Cu dendrites decorated with ZnO rods

Wang

Liu

Xue

2011

Cryst. Res. Technol.

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In this paper, copper dendrites decorated with ZnO rods have been electrolessly deposited on brass substrate by a simple galvanic replacement method. SEM images show that these copper dendrites possess a pronounced trunk and highly ordered branches distributed on both sides of the trunk. Meanwhile, both the trunk and branches are decorated with ZnO rods. The diffusion-limited aggregation (DLA) model has been used to explain the fractal growth of Cu dendritic structures. This method provides a facile route to the synthesis of copper dendrites with ZnO, which can be extended to the preparation of other forms threedimensional (3-D) metal structures or metal/ZnO composites by modifying electrolyte parameters such as composition, concentration, pH and temperature.

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“…Moreover, because the chemical properties of a-Fe 2 O 3 depend on the particle size, morphology, dimensionality and surface structure, considerable attention has been focused on the fabrication of a-Fe 2 O 3 material. Until now, a series of structures and morphologies of a-Fe 2 O 3 have been fabricated, including dendritic micro-pine [7,9,10], nanorod [11,12], nanotube [13,14], airplane [15], nanowire [16], hollow sphere [17], flower [18], ellipse [19], nanobelt [20], microsized peanut [21], etc., by a variety of methods. Compared with other methods, hydrothermal synthesis has attracted rapidly increasing interest for the preparation of micro-nanocrystals due to the following advantages: the products with high purity, morphologies easy to be controlled and low reaction temperature.…”

Section: Introductionmentioning

confidence: 99%