Large scale solvothermal synthesis and a strategy to obtain stable Langmuir–Blodgett film of CoFe2O4 nanoparticles

Thampi, Arya; Babu, K. Sowri; Verma, Seema

doi:10.1016/j.jallcom.2013.02.139

Cited by 9 publications

(3 citation statements)

References 42 publications

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“…In addition, the five ZFC profiles exhibit a linear region starting from 10 K which corresponds to the tendency to saturation accompanied directly by a large increase in the magnetization magnitude up to the blocking temperature, while a trend to the saturation has been observed in the five ZF magnetization curves, which confirms the presence of strong A-B dominant dipolar interactions [34]. The previously mentioned typical superparamagnetic behavior has been observed in a similar work devoted to the cobalt ferrite nanoparticles [34].…”

Section: Squid Magnetometrysupporting

confidence: 76%

“…Within these domains, the magnetic anisotropy energy barrier value, KV, becomes smaller than the thermal energy value, K B T, leading to the deblocking of magnetic moment switchability to the applied field which caused the transition to the superparamagnetic state, obeying to the Curie-Weiss law [32,33]. In addition, the five ZFC profiles exhibit a linear region starting from 10 K which corresponds to the tendency to saturation accompanied directly by a large increase in the magnetization magnitude up to the blocking temperature, while a trend to the saturation has been observed in the five ZF magnetization curves, which confirms the presence of strong A-B dominant dipolar interactions [34]. The previously mentioned typical superparamagnetic behavior has been observed in a similar work devoted to the cobalt ferrite nanoparticles [34].…”

Section: Squid Magnetometrymentioning

confidence: 84%

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Sol-gel Autocombustion Elaboration and Physiochemical Characterizations of Cu2+ Substituted Cobalt Ferrite Nanoparticles

Hamdi¹,

Bessaïs²,

Belam³

2020

CHEM

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Introduction: The copper doped cobalt ferrite series, with nominal formula CuXCo1-XFe2O4 (X = 0, 0.25, 0.5, 0.75, 1), has been elaborated via sol-gel autocombustion process by copper substitution procedure into cobalt ferrite framework. Methods: The five synthesized ferrites have been analyzed by X-ray powder diffraction, Fourier transform infrared spectroscopy, field emission scanning electron microscopy coupled to energy dispersive X-ray spectroscopy, complex impedance spectroscopy and superconducting quantum interference device magnetometry. Results and Discussion: The analysis of the results allowed to deduce that the cubic spinel basic structure was not modified by the incorporation of copper into the host lattice and the corresponding pure fine powders obtained formed by homogeneous nanoparticles. The highest electrical conductivity value, σDC(373K) = 27.03x10-3S.cm-1, was observed in the case of CuFe2O4. Conclusion: Moreover, the superparamagnetic behavior at room temperature has been confirmed by using both ZFC-FC and hysteresis magnetic measurement modes. In addition, the remarkable electrical conductivity and magnetic properties of the five explored nanoferrites, derived from the present investigation, enabled them useful in several modern nanotechnological and biomedical applications.

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Section: Squid Magnetometrysupporting

confidence: 76%

Section: Squid Magnetometrymentioning

confidence: 84%

Sol-gel Autocombustion Elaboration and Physiochemical Characterizations of Cu2+ Substituted Cobalt Ferrite Nanoparticles

Hamdi¹,

Bessaïs²,

Belam³

2020

CHEM

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“…The TEM image in Figure1bmore evidences the modification of CNT with several nanoparticles. The clear lattice fringes can be observed in Figure1cand the interplane distances are 0.205 and 0.256 nm, corresponding to the (110) crystal planes of cubic metallic Fe and (311) crystal planes of cubic CoFe 2 O 4 , respectively 29. The HAADF-STEM image and the corresponding elementals mapping in Figure1d−h demonstrate the components of hybrids and the distribution of elementals C, Co, Fe, and O.…”

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confidence: 99%

Coupling Bimetallic Oxides/Alloys and N-Doped Carbon Nanotubes as Tri-Functional Catalysts for Overall Water Splitting and Zinc–Air Batteries

Qin

Chen

et al. 2018

ACS Appl. Mater. Interfaces

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An effectively multifunctional electrocatalyst is crucial for catalyzing the reactions occurred at electrodes in zinc−air batteries and water splitting cells, such as oxygen evolution reaction (OER), hydrogen evolution reaction (HER), and oxygen reduction reaction (ORR). Herein, two non-noble metal-based multifunctional electrocatalysts of Ndoped carbon nanotubes NCNT/CoFe−CoFe 2 O 4 and NCNT/MnO−(MnFe) 2 O 3 are prepared by a simple solvothermal procedure, followed by two-step annealing under the argon and ammonia atmosphere. The resultant electrocatalysts exhibit good trifunctional performances for HER, ORR, and OER. Notably, the NCNT/CoFe−CoFe 2 O 4 and NCNT/MnO−(MnFe) 2 O 3 assembled zinc−air batteries exhibit high energy densities of 727 and 776 W h kg Zn −1 at the current density of 20 mA cm −2 , respectively. Furthermore, the NCNT/CoFe−CoFe 2 O 4 -based rechargeable zinc−air battery remains excellent durability after discharge−charge cycle testing for 22 h, comparable to the noble metal-based catalyst (Pt/C + IrO 2 )-assembled zinc−air battery. Furthermore, the NCNT/ CoFe−CoFe 2 O 4 and NCNT/MnO−(MnFe) 2 O 3 -assembled water splitting cells need ∼1.65 and 1.70 V, respectively, to deliver a current density of 10 mA cm −2 , lower than that of IrO 2 −Pt/C (1.71 V) and present excellent durability under long-term electrolysis. This work provides a facile strategy to prepare highly active multiple functional electrocatalysts for energy conversion and storage.

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Structural, Electrical and Magnetic Properties of Copper-Substituted Co0.8−XNi0.2 Ferrites Synthesized by Sol–Gel Autocombustion Process

Hamdi

Belam

2023

J. Electron. Mater.

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Large scale solvothermal synthesis and a strategy to obtain stable Langmuir–Blodgett film of CoFe2O4 nanoparticles

Cited by 9 publications

References 42 publications

Sol-gel Autocombustion Elaboration and Physiochemical Characterizations of Cu2+ Substituted Cobalt Ferrite Nanoparticles

Sol-gel Autocombustion Elaboration and Physiochemical Characterizations of Cu2+ Substituted Cobalt Ferrite Nanoparticles

Coupling Bimetallic Oxides/Alloys and N-Doped Carbon Nanotubes as Tri-Functional Catalysts for Overall Water Splitting and Zinc–Air Batteries

Structural, Electrical and Magnetic Properties of Copper-Substituted Co0.8−XNi0.2 Ferrites Synthesized by Sol–Gel Autocombustion Process

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