Synthesis of electrocrystallized cobalt ferrite nanopowders by tuning the cobalt salt concentration

Mosivand, Saba; Kazeminezhad, Iraj

doi:10.1039/c4ra17162d

Cited by 25 publications

(6 citation statements)

References 45 publications

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“…There is also the existence of a peak at 786.6 eV, which again confirms the presence of Co 2+ . This is in accordance with the XRD data, which proves that there are no mixed phases of CoO or Fe 2 O 3 in the Nk samples 41 . Figure 5c shows Au binding energies with doublet peaks at 83.8 and 87.4eV thus denoting the Au state of Au4f7/2 and Au4f5/2, respectively.…”

Section: Resultssupporting

confidence: 90%

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Plasmonic/Magnetic Multifunctional nanoplatform for Cancer Theranostics

Ravichandran

Oza

Velumani

et al. 2016

Sci Rep

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A multifunctional magneto-plasmonic CoFe2O4@Au core-shell nanoparticle was developed by iterative-seeding based method. This nanocargo consists of a cobalt ferrite kernel as a core (Nk) and multiple layers of gold as a functionalizable active stratum, (named as Nk@A after fifth iteration). Nk@A helps in augmenting the physiological stability and enhancing surface plasmon resonance (SPR) property. The targeted delivery of Doxorubicin using Nk@A as a nanopayload is demonstrated in this report. The drug release profile followed first order rate kinetics optimally at pH 5.4, which is considered as an endosomal pH of cells. The cellular MR imaging showed that Nk@A is an efficient T2 contrast agent for both L6 (r2-118.08 mM−1s−1) and Hep2 (r2-217.24 mM−1s−1) cells. Microwave based magnetic hyperthermia studies exhibited an augmentation in the temperature due to the transformation of radiation energy into heat at 2.45 GHz. There was an enhancement in cancer cell cytotoxicity when hyperthermia combined with chemotherapy. Hence, this single nanoplatform can deliver 3-pronged theranostic applications viz., targeted drug-delivery, T2 MR imaging and hyperthermia.

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Section: Resultssupporting

confidence: 90%

“…5a situated at around 711.7 and 725 eV respectively, were broadened due to the presence of Fe 3+ ions in tetrahedral sites 39 40 . There is also a satellite peak of Fe 3+ at 719.6 eV, which confirms the presence of Fe 3+ 41 . The orbitals of Co ( Fig.…”

Section: Resultsmentioning

confidence: 58%

Plasmonic/Magnetic Multifunctional nanoplatform for Cancer Theranostics

Ravichandran

Oza

Velumani

et al. 2016

Sci Rep

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“…To date, there have been only a few reports on the electrosynthesis of oxide nanoparticles. [18][19][20][21] One of the great advantages of this synthetic route is that an inert atmosphere is not necessary to avoid oxidation of the Fe 3 O 4 particles to Fe 2 O 3 . 22 Iron oxide nanoparticles possess high surface energy due to their large surface-to-volume ratio.…”

Section: Introductionmentioning

confidence: 99%

Functionalization and characterization of electrocrystallized iron oxide nanoparticles in the presence of β-cyclodextrin

Mosivand

Kazeminezhad

2016

CrystEngComm

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Electrocrystallized iron oxide nanoparticles were prepared by a chronoamperometric technique in the presence of β-cyclodextrin. The electrocrystallization process was performed with two iron electrodes in an electrolytic bath. The effect of β-cyclodextrin concentration, applied potential and bath temperature on the structural properties and magnetization of the nanoparticles was studied. FT-IR spectroscopy, X-ray diffraction, electron microscopy, magnetometry and Mössbauer spectroscopy were used to characterize the samples. XRD patterns confirmed the formation of the spinel Fe 3 O 4 crystal structure. FT-IR spectra confirmed the presence of organic molecules at the surface of the particles. Electron microscopy images showed that the mean particle size is in the range 20-80 nm. Based on these images, we found that tuning the growth conditions has a strong effect on the particle size and morphology. High-resolution transmission electron microscopy images showed the aggregation of very fine crystallites with different orientations. The lattice striations confirmed the well-crystallized nature of the nanoparticles. The ring-like electron diffraction patterns are attributed to diffraction from the crystal planes of iron oxide nanoparticles.Room-temperature magnetization loops showed that all samples are magnetically soft with very little hysteresis, but the specific magnetization ranging from 14-80 A m 2 kg −1 is highly dependent on the particle size and the experimental conditions. The room-temperature Mössbauer spectra are typical of nonstoichiometric Fe 3−δ O 4 , with a small excess of Fe 3+ (0.07 ≤ δ ≤ 0.18). Our results showed that it is possible to improve the crystal structure of the particles by tuning the growth parameters.

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“…The obtained pore size distribution calculated via the Barrett-Joyner-Halenda (BJH) method demonstrated the mesoporous nature of 18.28, 17.19, 37.33, 24.29 Figure 9d [37]. As depicted in Figure 9e, the XPS explains the origin of oxygen vacancies and the main peak at the high resolution O1s peak having binding energies of 530.3 eV, respectively [38]. The XPS analytical results shown above are consistent with XRD for CoFe2O4 and W-substituted CoFe2O4 nanoparticles, confirming the formation of pure CoFe2O4 and W-substituted CoFe2O4 structures free from any type of impurities and a mixed phase.…”

Section: Surface and Pore Size Distribution Analysismentioning

confidence: 83%

The Structure, Magnetic, and Gas Sensing Characteristics of W-Substituted Co-Ferrite Nanoparticles

et al. 2022

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Ferrites have been broadly investigated as gas sensors. The present article reports on the synthesis of Co-ferrite doped with W ions and their gas sensing abilities. A series of single phase CoFe2O4 powder with different W-doping (0.0 ≤ x ≤ 0.15) was synthesized using sol-gel synthesis. A variation in the saturation magnetization (Ms) and the lattice dimension with W(VI) substitution was associated with a change in the distribution of Fe (III) ions between tetrahedral and octahedral sites. Introducing W (VI) ions into the spinel lattice induced the rearrangement of Fe (III) ions. The total Ms increased with W-doping up to x = 0.05 (Ms = 50.1 Am2/kg) and it dramatically decreased to 34.6 Am2/kg with x = 0.15 of doping. However, the lattice parameter increased with increasing doping levels. Different W-doped CoFe2O4 were examined for a gas sensing response in the temperature range of 200–450 °C. Comparing the sensor responses to various reducing gases, the material’s response was shown to be sensitive and selective for acetone. The addition of W (0.15%) had a significant impact on the response and on the operating temperature of the sensor material, indicating that it might be used as an acetone sensor.

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Synthesis of electrocrystallized cobalt ferrite nanopowders by tuning the cobalt salt concentration

Cited by 25 publications

References 45 publications

Plasmonic/Magnetic Multifunctional nanoplatform for Cancer Theranostics

Plasmonic/Magnetic Multifunctional nanoplatform for Cancer Theranostics

Functionalization and characterization of electrocrystallized iron oxide nanoparticles in the presence of β-cyclodextrin

The Structure, Magnetic, and Gas Sensing Characteristics of W-Substituted Co-Ferrite Nanoparticles

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