Synthesis of phase pure iron oxide polymorphs thin films and their enhanced magnetic properties

Kumar, Pawan; No-Lee, Heung; Kumar, Rajesh

doi:10.1007/s10854-014-2203-9

Cited by 66 publications

(31 citation statements)

References 46 publications

(60 reference statements)

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“…XRD distinct peaks of iron oxide nanoparticles synthesized by magnetic stirring (FeM) and ultrasonication (FeU) are indexed at the 2 θ values of 29.8, 35.3, 42.8, 53.2, 57.0, and 62.4° representing (2 2 0), (3 1 1), (4 0 0), (4 2 2), (5 1 1), and (4 4 0) crystallographic planes, respectively. Their presence represents the cubic structure of magnetic iron oxide nanoparticles [36, 49–52]. The sharp peaks indicate the highly crystalline nature of the synthesized nanoparticles.…”

Section: Resultsmentioning

confidence: 99%

Ultrasound Assisted Green Synthesis of Silver and Iron Oxide Nanoparticles Using Fenugreek Seed Extract and Their Enhanced Antibacterial and Antioxidant Activities

Deshmukh

Gupta

Kim

2019

BioMed Research International

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This study reports a facile and ecofriendly approach for the ultrasound assisted synthesis of silver and iron oxide nanoparticles and their enhanced antibacterial and antioxidant activities. The fenugreek seed extract was used as reducing, capping, and stabilizing agent in the synthesis of nanoparticles. The transmission electron microscopy results showed that nanoparticles synthesized by ultrasonication have a smaller size (~20 nm) as compared to the nanoparticles fabricated by magnetic stirring (~40 nm). The color change of the solution from milky white to brown suggested the formation of silver nanoparticles which was confirmed by the presence of an absorbance peak at 396 nm. The results of powder X-ray diffraction and energy dispersive X-ray spectroscopy confirmed the crystallinity and elements present in nanoparticles synthesized using fenugreek seed extract. Fourier transform infrared analysis showed that the fenugreek seed phytochemicals were coated on the nanoparticle surface. Thermal gravimetric analysis showed the thermal degradation and stability of nanoparticles. Magnetization study of iron oxide nanoparticles confirmed the superparamagnetic nature. The silver nanoparticles showed antibacterial activities against both gram-negative (Escherichia coli) and gram-positive (Staphylococcus aureus) bacteria, while no antibacterial activities were observed for iron oxide nanoparticles. The ultrasound assisted nanoparticles showed higher stability and antibacterial and antioxidant activity compared with the nanoparticles fabricated by magnetic stirring.

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Section: Resultsmentioning

confidence: 99%

Ultrasound Assisted Green Synthesis of Silver and Iron Oxide Nanoparticles Using Fenugreek Seed Extract and Their Enhanced Antibacterial and Antioxidant Activities

Deshmukh

Gupta

Kim

2019

BioMed Research International

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“…Due to its high Curie temperature of 585 °C and high spin polarization, magnetite is widely applied as magnetic material in magnetic storage media, and medical applications , . Hematite thin films have been extensively investigated in the last years due to the narrow optical band gap in the visible region, enabling promising characteristics for photoelectrochemical applications as a photoanode material .…”

Section: Introductionmentioning

confidence: 99%

“…Ideally, precursors for CSD should combine specific characteristics such as high solubility and stability in organic solvents, nontoxicity, and a good compromise between stability to handling in ambient atmosphere and hydrolysis (reactivity) that can enable easy cleavage of ligands to obtain high‐purity films on processing. Commonly used iron precursors for CSD of iron oxide are FeCl 2 , FeCl 3 ,, Fe(NO 3 ) 3 ,, and [Fe 4 (mdea) 6 · 6CHCl 3 ] . However, most of these compounds do not feature high solubility and stability in solution, and thus necessitate the use of additives such as amines or long‐chain alcohols to enhance the solubility and stabilize the solution , .…”

Section: Introductionmentioning

confidence: 99%

Tailored β‐Ketoiminato Complexes of Iron: Synthesis, Characterization, and Evaluation towards Solution‐Based Deposition of Iron Oxide Thin Films

et al. 2018

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The synthesis and characterization of five new and closely related homoleptic iron(II) -ketoiminate complexes is reported. Molecular structures of compounds 1, 2, and 5 were determined by single-crystal XRD, which revealed monomeric four-and sixfold coordination, depending on the functionalized side chain. The stepwise elimination of the ligand from the complex observed by thermogravimetric analysis and the stability in solution are encouraging features for solution-based [a] 1824 processing of hematite thin films. As a representative example, compound 1 was successfully employed in a straightforward spin-coating process. The fabricated iron oxide films were characterized in terms of their structure and phase by XRD and Raman spectroscopy, morphology by SEM, and composition by Rutherford backscattering spectrometry accompanied by nuclear reaction analysis, which revealed the formation of crystalline and stoichiometric α-Fe 2 O 3 films. sition (CSD) techniques of iron oxides such as spin coating, [12] sol-gel processes, [13] and spray pyrolysis [14,15] are of particular interest due to their simple and cost-efficient setup, easy scaleup, and ambient processing conditions. [16] Ideally, precursors for CSD should combine specific characteristics such as high solubility and stability in organic solvents, nontoxicity, and a good compromise between stability to handling in ambient atmosphere and hydrolysis (reactivity) that can enable easy cleavage of ligands to obtain high-purity films on processing. Commonly used iron precursors for CSD of iron oxide are FeCl 2 , [7] FeCl 3 , [14,17] Fe(NO 3 ) 3 , [18,19] and [Fe 4 (mdea) 6 ·6CHCl 3 ]. [20] However, most of these compounds do not feature high solubility and stability in solution, and thus necessitate the use of additives such as amines or long-chain alcohols to enhance the solubility and stabilize the solution. [19,21] Metal alkoxides, for example, [Fe(OtBu) 3 ] 2 , are stable in solution but prone to hydrolysis on exposure to ambient conditions. [22] In the search for suitable precursors for CSD of iron oxide thin films under ambient conditions, the class of metal -ketoiminates is a potential candidate. This ligand class, which has already been successfully applied in metal oxide and nitride CVD and atomic layer deposition (ALD) processes involving metals such as Fe, Zr, Pd, Ga, Ir, Ti, Nb, Ta, and Zn,[23][24][25] features both oxygen and nitrogen coordination, which is a compromise between the highly reactive and thermally unstable nitrogen-bonded metal -diketiminates and the highly stable oxygen-coordinated metal -diketonates. As recently demonstrated by us, iron(II) -ketoiminates are highly promising for gas-phase deposition of iron oxide nanostructures via both ALD and CVD routes at low temperatures. [26] Our next goal was to evaluate this class of compounds for a simple and cost-effective CSD process for iron oxide thin films. As mentioned above, CSD requires precursors with suitable characteristics. The advantageous properties associated with Eur.

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“…As reported by Kumar et al, Fe 3 O 4 and α-Fe 2 O 3 show similar crystal structure and can not be distinguished by some techniques [12]. Raman spectroscopy is used for detailed analysis of iron oxide.…”

Section: Resultsmentioning

confidence: 99%

Spectroscopic Characterization of Some Foil Alloys Based on Nickel

Aygün

2019

Kocaeli Journal of Science and Engineering

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In this research, we carried out some structural and magnetic analyses of foil alloys in the form of NixCuyFez (x=0.65, y=0.33, z=0.02); NixFeyCuzMot (x=0.77, y=0.14, z=0.05, t=0.04); NixCryCoz(MoTiAlFe)t (x=0. 58, y=0.19, z=0.14, t=0.09) and NixCoyCrzFet(NMoMn)w (x=0.13, y=0.425, z=0.20, t=0.20, w=0.045). In order to have knowledge about the magnetic properties, we use electron paramagnetic resonance spectroscopy which is effective to see the paramagnetism in the structure. For structural analyses, several techniques were studied. Fouirer transform infrared spectrophotometer was performed to understand the functional groups in the structures. Raman experiment was applied for determination of molecular contents and minerology of the samples. Energy dispersive spectrosopy was used to learn the elemental compositions of the foils. The surface morphologies were seen by scanning electron microscopy. The obtained magnetic, structural and elemental results of the nickel based foil alloys are discussed in detail. 2667-484X © This paper published in Kocaeli Journal of Science and Engineering is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License

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Synthesis of phase pure iron oxide polymorphs thin films and their enhanced magnetic properties

Cited by 66 publications

References 46 publications

Ultrasound Assisted Green Synthesis of Silver and Iron Oxide Nanoparticles Using Fenugreek Seed Extract and Their Enhanced Antibacterial and Antioxidant Activities

Ultrasound Assisted Green Synthesis of Silver and Iron Oxide Nanoparticles Using Fenugreek Seed Extract and Their Enhanced Antibacterial and Antioxidant Activities

Tailored β‐Ketoiminato Complexes of Iron: Synthesis, Characterization, and Evaluation towards Solution‐Based Deposition of Iron Oxide Thin Films

Spectroscopic Characterization of Some Foil Alloys Based on Nickel

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