Structural and optical properties of α-Fe2O3 nanoparticles realized by simple thermal decomposition route

Srivastava, Manas; Kumar, Upendra

doi:10.1088/1402-4896/abc281

Cited by 9 publications

(2 citation statements)

References 29 publications

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“…'D' was calculated from the intercept of the Size-Strain Plot (SSP) and the micro-strain (h) was obtained from the slope, according to equation (1). The lattice parameter was estimated by combining Bragg's law with the cubic phase relation (equation ( 2)) [29,30]:…”

Section: X-ray Diffractionmentioning

confidence: 99%

Mixed magnetic behavior in gadolinium and ruthenium co-doped nickel oxide nanoparticles

Abdallah¹,

Awad²

2022

Phys. Scr.

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Pure and different concentrations from (Gd, Ru) co-doped NiO nanoparticles, capped with Polyvinylpyrrolidone (PVP), were fabricated by the co-precipitation method. The nanoparticles were characterized by different techniques. The Rietveld refinements of X-Ray Diffraction (XRD) patterns confirmed the formation of the pure face-centered-cubic NiO phase. The X-ray Photo-induced Spectroscopy (XPS) assured the trivalent oxidation state of the doped ions Gd3+ and Ru3+ and unveiled the multiple oxidation states of nickel ions (Ni2+ and Ni3+), emerging from the vacancies in the samples. The Transmission Electron Microscope (TEM) images showed the pseudospherical morphology of the samples and the Energy Dispersive X-ray permitted the quantitative analysis of the presented elements and their homogeneous distribution. The Raman and Fourier Transform Infra-Red (FTIR) spectra depicted the fundamental vibrational bands of NiO nanoparticles, confirming their purity. The UV-visible spectroscopy enabled the absorption measurements and the energy gap calculations. The co-dopants increased the energy bandgap of NiO nanoparticles from 3.15 eV for pure NiO to 3.62 eV with the highest concentration of the co-dopants (x = 0.02) The photoluminescence (PL) spectra gave insights into the possible defects present in the samples, such as nickel vacancies, single and double oxygen vacancies, and oxygen interstitials. The Vibrating Sample Magnetometer (VSM) studied the room temperature M-H loops of the co-doped samples. A combination of ferromagnetic, antiferromagnetic, and paramagnetic contributions was noticed and treated according to the law of approach to saturation and bound magnetic polaron (BMP) model. The magnetic parameters, such as the saturation magnetization, exchange and anisotropy field, and the BMP concentration were extracted from the fitted models and discussed in terms of the co-dopants’ concentration. The co-doped samples showed a softer magnetic behavior, which is recommended for data storage applications.

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Section: X-ray Diffractionmentioning

confidence: 99%

Mixed magnetic behavior in gadolinium and ruthenium co-doped nickel oxide nanoparticles

Abdallah¹,

Awad²

2022

Phys. Scr.

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“…Magnetic α-Fe 2 O 3 nanoparticles could prepared via many approaches, such as, hydrothermal method [31], pyrolytic process [32], coprecipitation method [33], sol-gel method [34,35], surfactant assisted reflux method [36]. These methods have some disadvantages of long preparation period, complicated operation and high cost.…”

Section: Introductionmentioning

confidence: 99%

Adsorption characteristics of bovine serum albumin onto α-Fe₂O₃ nanoparticles prepared via the alcohol solution combustion process of ferric nitrate

Zhu

et al. 2022

Mater. Res. Express

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The α-Fe2O3 nanoparticles were prepared via the alcohol solution combustion process of ferric nitrate. The scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS). X-ray diffraction (XRD), and vibrating sample magnetometer (VSM) were taken to characterize the prepared α-Fe2O3 nanoparticles. The average particle sizes of the as-prepared α-Fe2O3 nanoparticles were approximately 180 nm, and their magnetic property was approximately 0.42 emu·g-1 after the measurement. The different concentrations of BSA solutions and the adsorption times were investigated to investigate the adsorption characteristics of bovine serum albumin (BSA) onto α-Fe2O3 nanoparticles. For larger adsorption capacity and higher removal rate, the dose of α-Fe2O3 nanoparticles in aqueous solution was selected at 2.5 mg·mL-1. The adsorption process of BSA onto α-Fe2O3 nanoparticles conformed to the pseudo-first-order kinetic model. While, the correlation coefficient (R2) of the Temkin isothermal model was higher than Langmuir model and Freundlich isothermal model, suggesting that the isothermal model of BSA onto α-Fe2O3 nanoparticles was more in line with Temkin isotherm model. Which suggested that the adsorption behavior of magnetic α-Fe2O3 nanoparticles for BSA belonged to multi-molecular layer chemisorption. When BSA concentration was 600 mg·L-1 and the pH of solution was 5, the adsorption capacity of BSA onto magnetic α-Fe2O3 nanoparticles achieved 114.2 mg·g-1, and the adsorption rate could still reach 70.3% of the first time after 7 cycles.

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Self‐Formed Fluorinated Interphase with Fe Valence Gradient for Dendrite‐Free Solid‐State Sodium‐Metal Batteries

Lian

Jiang

Gao

et al. 2023

Adv Funct Materials

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The poor anode/electrolyte compatibility and dendrite growth have discouraged the development of solid‐state sodium‐metal batteries (SSSMBs). Here, a self‐formed interphase with a unique Fe valence gradient is designed to stabilize the anode interface of Na3Zr2Si2PO12 solid electrolyte. This interphase consists of a Fe‐ and NaF‐containing outer layer near the Na anode and a Fe2+/Fe3+‐rich inner layer, which are in situ formed upon contacting Na with a sodiophilic α‐Fe2O3‐xFx interlayer specially coated on Na3Zr2Si2PO12. The NaF and Fe prevents continuous reduction reactions and homogenize the electric filed, while the iron oxide gradient layer offers buffering Na storage during plating, further suppressing dendrite growth. Benefiting from the dynamically stable, low‐impedance and dendrite‐free interface, the symmetric cells achieve a 20‐fold reduction in interfacial resistance and a fourfold enhancement in critical current density (CCD) at 25 °C, and powered a high CCD of 1.9 mA cm‐2 and a 1000‐h cycle life at 1 mA cm‐2 at 80 °C. The corresponding SSSMBs based on Na3V2(PO4)3 cathodes deliver a capacity retention rate of 96% over 120 cycles at 1 C. This robust interface design supports one of the best electrochemical performances ever reported and offers a comprehensive solution to stabilize the Na3Zr2Si2PO12/Na interface toward practical SSSMBs.

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Structural and optical properties of α-Fe₂O₃ nanoparticles realized by simple thermal decomposition route

Cited by 9 publications

References 29 publications

Mixed magnetic behavior in gadolinium and ruthenium co-doped nickel oxide nanoparticles

Mixed magnetic behavior in gadolinium and ruthenium co-doped nickel oxide nanoparticles

Adsorption characteristics of bovine serum albumin onto α-Fe₂O₃ nanoparticles prepared via the alcohol solution combustion process of ferric nitrate

Self‐Formed Fluorinated Interphase with Fe Valence Gradient for Dendrite‐Free Solid‐State Sodium‐Metal Batteries

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Structural and optical properties of α-Fe2O3 nanoparticles realized by simple thermal decomposition route

Cited by 9 publications

References 29 publications

Mixed magnetic behavior in gadolinium and ruthenium co-doped nickel oxide nanoparticles

Mixed magnetic behavior in gadolinium and ruthenium co-doped nickel oxide nanoparticles

Adsorption characteristics of bovine serum albumin onto α-Fe2O3 nanoparticles prepared via the alcohol solution combustion process of ferric nitrate

Self‐Formed Fluorinated Interphase with Fe Valence Gradient for Dendrite‐Free Solid‐State Sodium‐Metal Batteries

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Product

Resources

About

Structural and optical properties of α-Fe₂O₃ nanoparticles realized by simple thermal decomposition route

Adsorption characteristics of bovine serum albumin onto α-Fe₂O₃ nanoparticles prepared via the alcohol solution combustion process of ferric nitrate