Comparative Studies of Microwave- and Sol-Gel-Assisted Combustion Methods of Fe3O4 Nanostructures: Structural, Morphological, Optical, Magnetic, and Catalytic Properties

Chinnaraj, K.; Manikandan, A.; Ramu, P.; Antony, S. Arul; Neeraja, P.

doi:10.1007/s10948-014-2835-2

Cited by 68 publications

(16 citation statements)

References 26 publications

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“…The bigger E g value of NPs prepared by co-precipitation method is attributed to the smaller particle size of 20 nm. Similarly, in another research performed by Manikandan et al [3,23], the particle size effect is attributed as the reason to detect bigger E g values of 2.12 eV from the Fe 3 O 4 NPs (with sizes of 20-25 nm) prepared by facile microwave combustion method [4]. They reported that the band gap decreased to 2.05 eV when the particle size increased to a range of 30-35 nm.…”

Section: Optical Propertiesmentioning

confidence: 77%

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Magneto Optical Properties of FeBxFe2−xO4 Nanoparticles

Amir

Geleri

Güner

et al. 2015

J Inorg Organomet Polym

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In this study, FeB x Fe 2-x O 4 nanoparticles (NPs) were synthesized by the polyol method. The M-H hysteresis curves exhibit superparamagnetic characteristics that are both coercivity and remanent magnetization values are negligible. The particle size dependent Langevin function was applied to calculate the magnetic particle dimensions around 9 nm. The measured magnetic moments of NPs are in range of (1.52-2.2) l B and almost half or less with respect to 4 l B of bulk Fe ferrite. Magnetic anisotropy was specified as uniaxial and calculated effective anisotropy constants (K eff ) are between 43.3 9 10 4 and 19.4 9 10 4 emu/g. The UV-Vis diffuse reflectance spectroscopy and Kubelka-Munk theory were used to determine the optical properties. The estimated optical band gap values (2.15-2.48 eV) of FeB x Fe 2-x O 4 NPs are bigger with respect to reported values (1.88-2.12 eV) for Fe 3 O 4 NPs in the literature. The bigger E g values are mainly attributed to B concentration and partly to quantum confinement effect.

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Section: Optical Propertiesmentioning

confidence: 77%

“…and Fe 2? ions in its octahedral sites [22,23]. In this research work, Boron element has been doped with these two (Fe 2?…”

Section: Introductionmentioning

confidence: 99%

Magneto Optical Properties of FeBxFe2−xO4 Nanoparticles

Amir

Geleri

Güner

et al. 2015

J Inorg Organomet Polym

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“…In general, X-ray diffraction analysis by peak width is due to instrumental amplification, increase in crystallite size and lattice strain due to dislocation [33]. Unbundling these contributions must collect a diffraction pattern of a standard material such as silicon to determine instrumental enlargement [34].…”

Section: Scherrer Methodsmentioning

confidence: 99%

“…Unbundling these contributions must collect a diffraction pattern of a standard material such as silicon to determine instrumental enlargement [34]. The corrected instrumental brodening β hkl [33] corresponding to peak CoAl 2 O 4 diffraction was estimated using the equation,…”

Section: Scherrer Methodsmentioning

confidence: 99%

X-ray peak profile analysis of CoAl2O4 nanoparticles by Williamson-Hall and size-strain plot methods

Irfan¹,

Racik²,

Ананд³

2018

MoEM

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Citation: Irfan H, Mohamed Racik K, Anand S (2018) X-ray peak profile analysis of CoAl 2 O 4 nanoparticles by Williamson-Hall and size-strain plot methods. Modern Electronic Materials 4(1): 31-40. https://doi. AbstractCoAl 2 O 4 nanoparticles were prepared by a sol-gel process using citric acid as chelating agent with different calcination temperatures of 600 to 900 °C. The crystalline spinel cubic phase was confirmed by X-ray diffraction results. High-resolution scanning electron microscopy (HRSEM) revealed that nanoparticles of CoAl 2 O 4 morphology showed spherical forms with a certain degree of agglomeration. The Williamson-Hall (W-H) method and size-strain method to evaluate the size of crystallites and strain in the CoAl 2 O 4 nanoparticles peak broadening were applied. Physical parameters such as strain and stress values were calculated for all XRD reflection peaks corresponding to the cubic spinel phase of CoAl 2 O 4 in the range of 20 to 70° from the modified plot shape by W-H plot assuming a uniform deformation model (UDM), uniform stress deformation model (USDM), uniform deformation energy density model (UDEDM) and by the size-strain plot method (SSP). The CoAl 2 O 4 NPs crystal size calculated on the W-H plots and the SSP method are in good agreement with the HRSEM Scherrer method.

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“…Compare to MHM route, the SGM methods have some disadvantageous such as required long time and high temperature for calcinations to complete final products and low production rates. In MHM approach, due to the direct interaction of MHM to the material interior with homogeneously, this can help to produce such active nanomaterials within few minutes of time [18]. Furthermore, MHM technique is short reaction time with easy route and the complex equipment is not needed, which making this method is very attractive.…”

Section: Introductionmentioning

confidence: 99%

Hibiscus rosa-sinensis Leaf Extracted Green Methods, Magneto-Optical and Catalytic Properties of Spinel CuFe2O4 Nano- and Microstructures

Manikandan

Durka²,

Antony

2015

J Inorg Organomet Polym

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Spinel CuFe 2 O 4 nano-and microstructures were synthesized by a simple, economical and eco-friendly microwave heating (MHM) and modified sol-gel methods (SGM) using metal nitrates and Hibiscus rosa-sinensis leaf extracted solution, instead of toxic inorganic/organic catalyst, template and surfactant. Powder XRD, FT-IR, EDX and SAED results were confirmed that the as-synthesized products have a single-phase spinel structure with high crystallinity and without the presence of any other secondary phase impurities. The morphology of the samples was revealed by HR-SEM and HR-TEM techniques show that the MHM and SGM products consist of nano-and microstructures, respectively, and their possible formation mechanisms were also proposed. The optical band gap (E g ) was measured using Kubelka-Munk model and it shows higher value (2.35 eV) for CuFe 2 O 4 -MHM than CuFe 2 O 4 -SGM (2.18 eV), due to the smaller particle size of CuFe 2 O 4 -MHM. The magnetic property of the samples showed a ferromagnetic behavior and the magnetization (M s ) value of CuFe 2 O 4 -MHM is higher i.e. 61.13 emu/g than CuFe 2 O 4 -SGM (57.25 emu/g). Both the samples were successfully tested as catalysts for the conversion of benzylic alcohols to respective carbonyls using H 2 O 2 (as oxidant) and acetonitrile (as a solvent) catalytic system. It was found that the CuFe 2 O 4 -MHM catalyst show best performance of conversion of aromatic alcohols into aldehydes than that of CuFe 2 O 4 -SGM. Spinel CuFe 2 O 4 catalyst is magnetically recyclable and could be reused with no significant loss in catalytic activity as proved for five consecutive cycles.

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Comparative Studies of Microwave- and Sol-Gel-Assisted Combustion Methods of Fe3O4 Nanostructures: Structural, Morphological, Optical, Magnetic, and Catalytic Properties

Cited by 68 publications

References 26 publications

Magneto Optical Properties of FeBxFe2−xO4 Nanoparticles

Magneto Optical Properties of FeBxFe2−xO4 Nanoparticles

X-ray peak profile analysis of CoAl2O4 nanoparticles by Williamson-Hall and size-strain plot methods

Hibiscus rosa-sinensis Leaf Extracted Green Methods, Magneto-Optical and Catalytic Properties of Spinel CuFe2O4 Nano- and Microstructures

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