Growth and characterization of α-Fe2O3 nanowires

Srivastava, Himanshu; Tiwari, Pragya; Srivastava, Arvind K.; Nandedkar, R. V.

doi:10.1063/1.2776222

Cited by 55 publications

(34 citation statements)

References 15 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…1-3 Hematite nanowires have been synthesized by many different techniques including surface oxidation, thermal oxidation and electrochemical deposition. [4][5][6][7] These are generally complex processes taking considerable time (1.5-120 h), needing different gas flows and high temperatures (400-800 • C). Also, these processes typically produce nanowires that are attached to a metallic substrate, and thus subsequent collection for device integration can be challenging.…”

mentioning

confidence: 99%

Laser-induced self-assembly of iron oxide nanostructures with controllable dimensionality

Henley

Mollah

Giusca

et al. 2009

Journal of Applied Physics

View full text Add to dashboard Cite

The nanosecond pulsed laser ablation of a fine iron powder submerged under different liquid media (water, methanol, ethanol and isopropanol) is used to rapidly produce a variety of iron oxide nanostructures from nanoparticles to nanowires and nanosheets. The dimensionality of the nanostructres is shown to be a consequence of two controllable mechanisms. The rapid oxidation, collisional quenching and coalescence of the ablation products is suggested as the dominant mechanism for the formation of 0D nanostructures such as hematite (α-Fe 2 O 3 ) nanoparticles in water, or iron oxyhydroxide nanoparticles under alcohols. By employing different laser wavelengths (248 and 532nm) it is demonstrated that the growth of extended iron oxyhydroxide nanostructures (1D nanowires and 2D nanosheets) under methanol is possible and is a consequence of a second self-assembly mechanism driven by interaction between the UV laser pulses and the ablation products.Low dimensional iron oxide nanostructures, such as nanoparticles and nanowires are of particular industrial and academic interest, not least because of their magnetic properties. Hematite (α-Fe 2 O 3 ) 1D nanostructures also have applications in lithium ion battery electrodes, gas sensors, field-effect transistors, and field emission cathodes. 1-3 Hematite nanowires have been synthesized by many different techniques including surface oxidation, thermal oxidation and electrochemical deposition. [4][5][6][7] These are generally complex processes taking considerable time (1.5-120 h), needing different gas flows and high temperatures (400-800 • C). Also, these processes typically produce nanowires that are attached to a metallic substrate, and thus subsequent collection for device integration can be challenging. Therefore, a solution based synthesis method to collect nanowires for * Electronic mail: s.henley@surrey.ac.uk † Present address: Department of Physics, Aligarh Muslim University, Aligarh-202002, India.1 rapid processing would be of considerable interest. Table 1 shows a comparison of time scales and process temperatures used in selected recent publications detailing iron oxide nanowire synthesis.Rapidly after the invention of the ruby laser in the 1960s, the capability of pulsed lasers to ablate material from the surface of solids was identified. Applications for pulsed laser ablation 8 (PLA) in materials processing and thin film deposition followed swiftly. Traditionally PLA and the subsequent material deposition is performed in vacuum or in dilute gaseous environments. The collisions of energetic ablated atoms with gas molecules in low-pressure gaseous environment, and any subsequent chemical reactions, has been identified a route for synthesizing multicomponent films with controllable stoichiometry. When the ambient gas pressure is increased, such that ablated species are expected to suffer multiple collisions within the reaction chamber, 9,10 the medium can be considered as weakly confining. In such confining environments nanoclusters of the target material ca...

show abstract

mentioning

confidence: 99%

Laser-induced self-assembly of iron oxide nanostructures with controllable dimensionality

Henley

Mollah

Giusca

et al. 2009

Journal of Applied Physics

View full text Add to dashboard Cite

show abstract

“…Although the surface energy of the [110] orientation is not the highest (de Leeuw & Cooper, 2007), the -Fe 2 O 3 nanoscale crystals preferred to grow along the [110] direction (Cvelbar et al, 2008;Kim et al, 2006;Takagi, 1957). In the crystal structure of -Fe 2 O 3 , the O atoms are close-packed in the (110) planes, the O-rich and Fe-deficient character on the (110) planes is considered to be the driving force for the preferential growth along the [110] direction (Srivastava et al, 2007;Wen et al, 2005). In addition, the bicrystal structure observed here did not affect the growth direction along [110].…”

Section: α-Fe 2 Omentioning

confidence: 99%

“…It is nontoxic, magnetic, corrosion resistant, and has promising applications in photocatalyst (Ohmori et al, 2000), sensor (Liao et al, 2008), magnetic storage media (Kim et al, 2006) and field emission (Yu et al, 2006). To date, various -Fe 2 O 3 nanostructures, including whiskers, nanowires and nanobelts, have been synthesized by the oxidation of iron during a wide temperature range using a hotplate (Yu et al, 2006), reactive oxygen plasma (Cvelbar et al, 2008), oxygen (Takagi, 1957;Wen et al, 2005), ozone (Srivastava et al, 2007), or a gas mixture Wang et al, 2005;Xu et al, 2009). In this section, we report the simple synthesis of -Fe 2 O 3 nanowires and nanobelts, via the direct thermal oxidation of iron substrates with or without gallium at temperatures of 600~800 ºC for 3 h in air.…”

Section: α-Fe 2 Omentioning

confidence: 99%

Growth of Nanowire and Nanobelt Based Oxides by Thermal Oxidation with Gallium

Yang¹,

Yasuda²,

Kukino³

et al. 2010

Nanowires Science and Technology

View full text Add to dashboard Cite

“…7 Recently, coating and synthesis of metallic Fe NWs with oxidizing agents have been attempted by many researchers in order to functionalize them or improve their wear and corrosion resistance for practical applications. 17 In the past decade, several advanced experimental growth techniques have been proposed, such as vapor-solid growth, 18 micro emulsion, 10 thermal oxidation, 12,19 and chemical vapor deposition, 8 and have been successfully applied for the synthesis of Fe-Fe x O y nano composite materials. The required well-defined structure, a uniform density, a prescribed diameter, and a morphology with unique size and shape of the Fe x O y shell layer around Fe NWs, which directly play a decisive role in the performance of Fe-Fe x O y composite materials, are difficult to control accurately.…”

Section: Introductionmentioning

confidence: 99%

“…The required well-defined structure, a uniform density, a prescribed diameter, and a morphology with unique size and shape of the Fe x O y shell layer around Fe NWs, which directly play a decisive role in the performance of Fe-Fe x O y composite materials, are difficult to control accurately. 7,12 Therefore, to obtain an atomic-level a)…”

Section: Introductionmentioning

confidence: 99%

Effects of oxidation on tensile deformation of iron nanowires: Insights from reactive molecular dynamics simulations

Aral

Wang

Ogata

et al. 2016

Journal of Applied Physics

View full text Add to dashboard Cite

The influence of oxidation on the mechanical properties of nanostructured metals is rarely explored and remains poorly understood. To address this knowledge gap, in this work, we systematically investigate the mechanical properties and changes in the metallic iron (Fe) nanowires (NWs) under various atmospheric conditions of ambient dry O 2 and in a vacuum. More specifically, we focus on the effect of oxide shell layer thickness over Fe NW surfaces at room temperature. We use molecular dynamics (MD) simulations with the variable charge ReaxFF force field potential model that dynamically handles charge variation among atoms as well as breaking and forming of the chemical bonds associated with the oxidation reaction. The ReaxFF potential model allows us to study large length scale mechanical atomistic deformation processes under the tensile strain deformation process, coupled with quantum mechanically accurate descriptions of chemical reactions. To study the influence of an oxide layer, three oxide shell layer thicknesses of $4.81 Å , $5.33 Å , and $6.57 Å are formed on the pure Fe NW free surfaces. It is observed that the increase in the oxide layer thickness on the Fe NW surface reduces both the yield stress and the critical strain. We further note that the tensile mechanical deformation behaviors of Fe NWs are dependent on the presence of surface oxidation, which lowers the onset of plastic deformation. Our MD simulations show that twinning is of significant importance in the mechanical behavior of the pure and oxide-coated Fe NWs; however, twin nucleation occurs at a lower strain level when Fe NWs are coated with thicker oxide layers. The increase in the oxide shell layer thickness also reduces the external stress required to initiate plastic deformation. Published by AIP Publishing.

show abstract

Growth and characterization of α-Fe2O3 nanowires

Cited by 55 publications

References 15 publications

Laser-induced self-assembly of iron oxide nanostructures with controllable dimensionality

Laser-induced self-assembly of iron oxide nanostructures with controllable dimensionality

Growth of Nanowire and Nanobelt Based Oxides by Thermal Oxidation with Gallium

Effects of oxidation on tensile deformation of iron nanowires: Insights from reactive molecular dynamics simulations

Contact Info

Product

Resources

About