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Magnetic, Pseudocapacitive, and H₂O₂-Electrosensing Properties of Self-Assembled Superparamagnetic Co_0.3Zn_0.7Fe₂O₄ with Enhanced Saturation Magnetization.

ABSTRACT: The present work explores the structural, microstructural, optical, magnetic, and hyperfine properties of Co_0.3Zn_0.7Fe₂O₄ microspheres, which have been synthesized by a novel template-free solvothermal method. Powder X-ray diffraction, electron microscopic, and Fourier transform infrared spectroscopic techniques were employed to thoroughly investigate the structural and microstructural properties of Co_0.3Zn_0.7Fe₂O₄ microspheres. The results revealed that the microspheres (average diameter ?121 nm) have been formed by self-assembly of nanoparticles with an average particle size of ?12 nm. UV-vis diffuse reflectance spectroscopic and photoluminescence studies have been performed to study the optical properties of the sample. The studies indicate that Co_0.3Zn_0.7Fe₂O₄ microspheres exhibit a lower band gap value and enhanced PL intensity compared to their nanoparticle counterpart. The outcomes of dc magnetic measurement and Mössbauer spectroscopic study confirm that the sample is ferrimagnetic in nature. The values of saturation magnetization are 76 and 116 emu g^-1 at 300 and 5 K, respectively, which are substantially larger than its nanosized counterpart. The infield Mössbauer spectroscopic study and Rietveld analysis of the PXRD pattern reveal that Fe³⁺ ions have migrated from [B] to (A) sites resulting in the cation distribution: (Zn²⁺ _0.46Fe³⁺ _0.54)_A[Zn²⁺ _0.24Co²⁺ _0.3Fe³⁺ _1.46]_BO₄. Comparison of electrochemical performance of the Co_0.3Zn_0.7Fe₂O₄ microspheres to that of the Co_0.3Zn_0.7Fe₂O₄ nanoparticles reveals that the former displays greater specific capacitance (149.13 F g^-1) than the latter (80.06 F g^-1) due to its self-assembled porous structure. Moreover, it was found that Co_0.3Zn_0.7Fe₂O₄ microspheres possess a better electrochemical response toward H₂O₂ sensing than Co_0.3Zn_0.7Fe₂O₄ nanoparticles in a wide linear range.

SUBMITTER: Mondal R

PROVIDER: S-EPMC6682044 | biostudies-literature | 2019 Jul

REPOSITORIES: biostudies-literature

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Magnetic, Pseudocapacitive, and H2O2-Electrosensing Properties of Self-Assembled Superparamagnetic Co0.3Zn0.7Fe2O4 with Enhanced Saturation Magnetization.

Mondal Rituparna R Sarkar Koyel K Dey Subhrajyoti S Majumdar Dipanwita D Bhattacharya Swapan Kumar SK Sen Pintu P Kumar Sanjay S

ACS omega 20190724 7

The present work explores the structural, microstructural, optical, magnetic, and hyperfine properties of Co0.3Zn0.7Fe2O4 microspheres, which have been synthesized by a novel template-free solvothermal method. Powder X-ray diffraction, electron microscopic, and Fourier transform infrared spectroscopic techniques were employed to thoroughly investigate the structural and microstructural properties of Co0.3Zn0.7Fe2O4 ...[more]

PMID: 31460384

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Project description:Talented di-phase ferrite/ferroelectric BaTi0.7Fe0.3O3@NiFe2O4 (BFT@NFO) in oval nano-morphology was chemically synthesized using controlled sol-gel processes and calcined at 600 °C. The effects of shielding using NiFe2O4 (NFO) nanoparticles on the microstructure, phase transition, thermal, and relative permittivity of BaTi0.7Fe0.3O3 (BTF) nano-perovskite were systematically explored. X-ray diffraction patterns and Full-Prof software exhibited the forming of the BaTi2Fe4O11 hexagonal phase. TEM and SEM images demonstrated that the coating of BaTi0.7Fe0.3O3 has been successfully controlled with exquisite nano-oval NiFe2O4 shapes. The NFO shielding can significantly promote the thermal stability and the relative permittivity of BFT@NFO pero-magnetic nanocomposites and lowers the Curie temperature. Thermogravimetric and optical analysis were used to test the thermal stability and estimate the effective optical parameters. Magnetic studies showed a decrease in saturation magnetization of NiFe2O4 NPs compared to their bulk system, which is attributed to surface spin disorder. Herein, characterization and the sensitive electrochemical sensor were constructed for the evaluation of peroxide oxidation detection using the chemically adjusted nano-ovals barium titanate-iron@nickel ferrite nanocomposites. Finally, The BFT@NFO exhibited excellent electrochemical properties which can be ascribed to this compound possessing two electrochemical active components and/or the nano-ovals structure of the particles which can further improve the electrochemistry through the possible oxidation states and the synergistic effect. The result advocates that when the BTF is shielded with NFO nanoparticles the thermal, dielectric, and electrochemical properties of nano-oval BaTi0.7Fe0.3O3@NiFe2O4 nanocomposites can be synchronously developed. Thus, the production of ultrasensitive electrochemical nano-systems for the determination of hydrogen peroxide is of extensive significance.

Dataset Information

Magnetic, Pseudocapacitive, and H₂O₂-Electrosensing Properties of Self-Assembled Superparamagnetic Co_0.3Zn_0.7Fe₂O₄ with Enhanced Saturation Magnetization.

Publications

Magnetic, Pseudocapacitive, and H<sub>2</sub>O<sub>2</sub>-Electrosensing Properties of Self-Assembled Superparamagnetic Co<sub>0.3</sub>Zn<sub>0.7</sub>Fe<sub>2</sub>O<sub>4</sub> with Enhanced Saturation Magnetization.

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