Characterizations of diverse mole of pure and Ni-doped α-Fe2O3 synthesized nanoparticles through chemical precipitation route

Sivakumar, S.; Anusuya, D.; Khatiwada, Chandra Prasad; Sivasubramanian, J.; Arul, Venkatesan; Soundhirarajan, P.

doi:10.1016/j.saa.2014.02.136

Cited by 76 publications

(30 citation statements)

References 24 publications

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“…In general, ions similar in size to the parent ion give effective improvement in properties without deflecting the structural properties to much extent. Similar modifications have been reported for iron oxide nanomaterials when doped by other transition metals [12][13][14][15].…”

Section: Introductionsupporting

confidence: 83%

Synthesis of ultra small iron oxide and doped iron oxide nanostructures and their antimicrobial activities

Atul

Kumar

Sharma

et al. 2019

Journal of Taibah University for Science

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Nanostructures of iron oxide and doped iron oxide with cobalt (Co), nickel (Ni) and zinc (Zn) have been prepared by wet chemical methods using sodium dodecyl sulphate (SDS) as capping agent. X-ray diffraction (XRD) and high resolution transmission electron microscopy (HRTEM) results showed that the nanostructures were crystalline with average crystallite size around 20 nm. The scanning electron microscopy (SEM) and transmission electron microscopy (TEM) images confirmed the granular shape of the nanostructures with ultra small size. The doping was confirmed in the XRD patterns and was well supported by Fourier transform infrared spectroscopy (FTIR). Band gap for iron oxide nanoparticles was found to be 2.2 eV and on doping the band gap found to be increased up to 2.5 eV. Ultra violet-visible (UV-Vis) measurements and blue shift of the optical band gap compliments the ultra small size of nanostructures as suggested by XRD, SEM and TEM studies. Interestingly, few of the compounds showed promising antifungal activity and might be used for antifungal treatment against fungal infection in future. ARTICLE HISTORY

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Section: Introductionsupporting

confidence: 83%

Synthesis of ultra small iron oxide and doped iron oxide nanostructures and their antimicrobial activities

Atul

Kumar

Sharma

et al. 2019

Journal of Taibah University for Science

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“…5a). [25][26][27] Therefore, it illustrated that there was no second phase presented in the ZrO 2 :Fe system. 5b).…”

Section: Resultsmentioning

confidence: 99%

Synthesis of ZrO₂:Fe nanostructures with visible-light driven H₂ evolution activity

Xiao

et al. 2015

J. Mater. Chem. A

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In this paper, the ZrO 2 :Fe nanostructures with precisely controlled Fe doping contents are obtained by using a template method. The characterizations obviously show that the as-prepared samples have hollow sphere-like morphology and high crystalline quality. Furthermore, the band gap of the ZrO 2 :Fe nanostructures is facilely tunable by controlling the Fe content. In addition, the density-functional theory (DFT) calculation reveals that the formation of an impurity band in the band gap narrows the band gap of the Fe-doped ZrO 2 nanostructures. The visible-light driven photocatalytic activity of ZrO 2 nanostructures could be remarkably enhanced by doping the Fe impurity. This can be attributed to the red shift of the absorption edge and the trapping effect of the ZrO 2 :Fe nanostructures. The research results provide a general and effective method to synthesize different photocatalysts with enhanced visible-light driven H 2 evolution activity.

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“…9(a)) represents the superposition of the magnetic behaviors of α-Fe 2 O 3 and NiO. α-Fe 2 O 3 exhibits weak ferromagnetism with saturation magnetization and coercive magnetic field of the order of 0.24 emu/g and 0.19 T, respectively [40] . On the other hand, NiO exhibits antiferromagnetism with saturation magnetization and coercive magnetic field of the order of 0.92x10 -2 emu/g and 0.14x10 -1 T, respectively [41][42] .…”

Section: Resultsmentioning

confidence: 99%

Cation Vacancies in NiFe2O4 During Heat Treatments at High Temperatures: Structural, Morphological and Magnetic Characterization

2019

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Nickel ferrite (NiFe 2 O 4) was synthesized by mixing stoichiometric amounts of α-Fe 2 O 3 and NiO using mechanical milling and heat treatments at high temperatures. The physical characterization of the samples was carried out using X-ray diffraction, infrared and Raman spectroscopies, Mössbauer spectrometry, magnetization measurements, scanning electron microscopy and energy dispersive X-ray spectroscopy. We found that NiFe 2 O 4 production increases from 81 to 100 wt. % with increasing temperature. Additionally, the lattice parameter and the saturation magnetization increase with increasing temperature. On the other hand, Mössbauer spectrometry showed that there is a decrease in the subspectral areas ratio for Fe 3+ cations at tetrahedral (A) and octahedral [B] sites, A A /A B , with the increase of the temperature. In the SEM micrographs it was observed that the samples consisted of particles with irregular shapes and micrometric sizes. From IR spectra, the intensity of the 411 cm-1 band (vibrations at octahedral sites) increases relative to the intensity of the 599 cm-1 band (vibrations at tetrahedral sites) with increasing temperature. From the results obtained in the magnetization curves, it was possible to confirm the synthesis of NiFe 2 O 4. As the heat treatment temperature increases, hysteresis loops with S-type geometric forms were obtained. All the results suggest that a defective spinel NiFe 2 O 4 is formed at 1000 °C, and that as the temperature increases, the defects gradually disappear. Neither cation reordering phenomena nor possible evaporation of chemical elements were the dominant effects to account for the results. The results can be explained if it is assumed that [B]-sites cation vacancies are gradually filled with cations as the temperature of the heat treatment increases.

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Characterizations of diverse mole of pure and Ni-doped α-Fe2O3 synthesized nanoparticles through chemical precipitation route

Cited by 76 publications

References 24 publications

Synthesis of ultra small iron oxide and doped iron oxide nanostructures and their antimicrobial activities

Synthesis of ultra small iron oxide and doped iron oxide nanostructures and their antimicrobial activities

Synthesis of ZrO₂:Fe nanostructures with visible-light driven H₂ evolution activity

Cation Vacancies in NiFe2O4 During Heat Treatments at High Temperatures: Structural, Morphological and Magnetic Characterization

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Characterizations of diverse mole of pure and Ni-doped α-Fe2O3 synthesized nanoparticles through chemical precipitation route

Cited by 76 publications

References 24 publications

Synthesis of ultra small iron oxide and doped iron oxide nanostructures and their antimicrobial activities

Synthesis of ultra small iron oxide and doped iron oxide nanostructures and their antimicrobial activities

Synthesis of ZrO2:Fe nanostructures with visible-light driven H2 evolution activity

Cation Vacancies in NiFe2O4 During Heat Treatments at High Temperatures: Structural, Morphological and Magnetic Characterization

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Synthesis of ZrO₂:Fe nanostructures with visible-light driven H₂ evolution activity