A facile route for high-throughput formation of single-crystal α-Fe2O3 nanodisks in aqueous solutions of Tween 80 and triblock copolymer

Chen, Deliang; Gao, Lian

doi:10.1016/j.cplett.2004.07.102

Cited by 40 publications

(15 citation statements)

References 33 publications

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“…Stimulated by both the promising applications of a-Fe 2 O 3 and the novel chemical and physical properties of nanoscale materials, considerable efforts have been devoted to the development of a-Fe 2 O 3 nanocrystals with different shapes and sizes. Up to now, various physical and chemical processes, such as pulsed laser ablation, chemical vapour deposition and the solution phase process have been employed to prepare a-Fe 2 O 3 nanostructured materials in various geometrical morphologies, including nanoparticles [13], nanoellipsoids [14], nanocubes [4,15], nanospindles [16], rhombohedral nanocrystals [17], nanowires [18,19], nanorings [20], nanotubes [21], nanobelts [22], nanorods [23], flutelike porous nanorods [24], hollow nanospheres [6], nanocapsules [11], nanoplates [25][26][27][28][29], micro-pines [30] and complex hierarchical structures constructed with nanoscale building blocks [31][32][33][34]. The hollow sea urchin-like a-Fe 2 O 3 nanostructures [4], porous nanospheres [5], hollow spheres [6], nanorings [20], nanotubes [21], naorods [23] and flutelike porous nanorods [24] of a-Fe 2 O 3 have been used to fabricate gas sensors for the detection of flammable and/or toxic gases.…”

Section: Introductionmentioning

confidence: 99%

“…In contrast, the investigations on two-dimensional structures are quite rare. Chen and Gao [25] firstly synthesized single-crystal a-Fe 2 O 3 nanodiscs with dimensions of 30-60 nm in diameter and 9-11 nm in thickness by a hydrothermal route in the presence of Tween 80 and triblock copolymer P123. Subsequently, the Fe 2 O 3 nanoplates were also syntheized via a citric acid (CA)-assisted hydrothermal process [26] and selective oxalic acid etching [29].…”

Section: Introductionmentioning

confidence: 99%

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Synthesis and size-dependent magnetic properties of single-crystalline hematite nanodiscs

Bao¹,

Yang²,

Wang³

et al. 2011

Journal of Crystal Growth

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Synthesis and size-dependent magnetic properties of single-crystalline hematite nanodiscs

Bao¹,

Yang²,

Wang³

et al. 2011

Journal of Crystal Growth

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“…Recently, the photocatalytic degradation of toxicants became one of the most promising directions of "green chemistry" [3]. The use of nanosized SO presents a great interest due to their outstanding optical, magnetic, catalytic, and sensing properties [4,5]. The phenolic compounds contained in the wastewater of chemical, petrochemical, and pharmaceutical industries are hazardous carcinogenic and mutagenic pollutants [6,7].…”

Section: Introductionmentioning

confidence: 99%

Sol-Gel Synthesized Semiconductor Oxides in Photocatalytic Degradation of Phenol

Cherepivska

Prihod’ko

2014

ISRN Physical Chemistry

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Effectiveness of photocatalytic degradation of phenol in aqueous solution using semiconductor oxides (SO) prepared by a sol-gel method was examined. The physical and chemical properties of synthesized catalysts were investigated by X-ray diffraction (XRD), diffuse reflectance UV-Vis spectroscopy (DRS), and N 2 -adsorption measurements. The optimal conditions of the photocatalytic degradation of phenol using prepared titanium dioxide sample were defined.

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“…This will involve extensive variety of techniques including electrodeposition in an alumina template [177,178], hydrothermal reactions [179,180], sol-gel and solvothermal techniques [181][182][183], thermal oxidation [184][185][186], chemical vapor deposition [187], as well as CVD assisted by plasma. [188] Many of these techniques are limited by long reaction times, especially thermal oxidation, or are limited in scalability.…”

Section: Discussionmentioning

confidence: 99%

Phase transformation studies of metal oxides to dichalcogenides in 1-d structures.

Cummins¹,

Ray²

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Recently, the use of materials with nanoscale morphologies has expanded, particularly with applications in energy conversion, catalysis, and energy storage. One drawback to single crystalline nanomaterials, especially 1D nanowires, is the difficulty in synthesizing these compounds, as the material chemistry becomes more complicated.Metal oxide nanowires can be synthesized easily and can be produced in relatively large quantities. However, more complex materials, such as metal chalcogenides, cannot typically be synthesized using facile methods, and currently very few techniques involve scalable methods. Phase transformation of metal oxides nanowires to form metal sulfides and selenides by gas-solid reactions is one viable route to scalable chalcogenide production. However, the transformation of 1D materials from oxides to other compositions using gas-solid reactions has not been well studied and the underlying mechanisms involved with phase transformation are minimally understood. A fundamental understanding of how gas phase reactants interact with nanomaterials is critical to not only making new materials on the nanoscale, but also allowing the engineering and optimization of nanomorphologies for functional applications.v Iron sulfide and molybdenum sulfide nanowires are chosen as the two model materials to investigate crystal phase transformations in 1D systems.In reaction of Fe2O3 single crystal nanowires with H2S gas to form FeS, the formation of a hollow nanotube morphology is observed, caused by unequal diffusion of the cation and anion, resulting in the accumulation of voids. These findings suggest that the reactant (sulfur) does not diffuse into the nanostructure; rather, iron atoms diffuse outward and react on the surface. The resulting FeS compound also has interesting optical absorption properties that could be of use in solar applications.The conversion of MoO3 nanowires in an attempt to form MoS2 nanowires resulted in a MoS2/MoOx shell/core nanowire morphology, with strong diffusion limits in formation of the sulfide shell. In this case, the sulfur diffusion through the MoS2 shell limits the reaction, leading to core-shell morphology.The MoS2/MoOx shell/core architecture shows considerable activity for electrocatalysis of the hydrogen evolution reaction due to the high surface area architecture for edge plane sites. Chemical intercalation of the MoS2 shell shows a further change in the crystal morphology and an improvement in catalytic activity. Reducing agents (hydrazine) are also investigated in attempts to chemically modify the MoS2 surface, changing the surface charge carrier concentrations. This is the first report of the effect of hydrazine in any chalcogenide system and the hydrazine treated MoS2 nanowire architecture shows one of the best electrocatalytic performance to date. The chemical modifications of MoS2 1D structures suggest the electrocatalytic activity can be tuned and corresponding architectures could be synthesized through phase transformation by design. These experiments help to d...

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A facile route for high-throughput formation of single-crystal α-Fe2O3 nanodisks in aqueous solutions of Tween 80 and triblock copolymer

Cited by 40 publications

References 33 publications

Synthesis and size-dependent magnetic properties of single-crystalline hematite nanodiscs

Synthesis and size-dependent magnetic properties of single-crystalline hematite nanodiscs

Sol-Gel Synthesized Semiconductor Oxides in Photocatalytic Degradation of Phenol

Phase transformation studies of metal oxides to dichalcogenides in 1-d structures.

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