Nanocrystalline Ce doped CoFe2O4 as an acetone gas sensor

Khandekar, M.S.; Tarwal, N.L.; Mulla, I.S.; Suryavanshi, S.S.

doi:10.1016/j.ceramint.2013.06.021

Cited by 79 publications

(16 citation statements)

References 33 publications

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“…Nanostructured spinel ferrites have an enormous prospective material for several innovative scientific and technological applications [1][2][3]. Spinel ferrites are widely used in microwave devices [4], solar cells [5], magneto-strictive sensors [6], transducers [7], super-capacitors [8], power supplies for a large variety of electronic gadgets [9], drug delivery [10], memory devices [11], catalysis [12] and spintronics devices [13].…”

Section: Introductionmentioning

confidence: 99%

Sol–gel auto-ignition fabrication of Gd3+ incorporated Ni0.5Co0.5Fe2O4 multifunctional spinel ferrite nanocrystals and its impact on structural, optical and magnetic properties

Pawar¹,

Khirade

Vinayak³

et al. 2020

SN Appl. Sci.

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Monophasic nanocrystals of rare earth gadolinium (Gd 3+) ion doped nickel-cobalt ferrite, Ni 0.5 Co 0.5 Gd y Fe 2−y O 4 (y = 0.00, 0.025, 0.050, 0.075, 0.100 and 0.125) have been synthesized by l-ascorbic acid assisted sol-gel auto-ignition process. Thermogravimetric and differential scanning calorimetry, X-ray diffraction, Fourier transform infrared spectroscopy (FTIR), transmission electron microscopy (TEM) with selected area electron diffraction (SAED) patterns, ultraviolet-visible spectrophotometry and vibrating sample magnetometer were employed to characterize the microstructure, optical and magnetic properties. Structural investigations verified the presence of cubic spinel phase short of any contamination peak. The average crystallite size was seen in nano-regime dimensions and well confirmed by TEM results. SAED patterns showed bright and intense ring of (311) plane revealed the establishment of spinel ferrite nanocrystals. Lattice constant (a) increases steadily with the rise in Gd 3+ content following the Vegard's law. FTIR spectra confirmed the creation of spinel ferrite structural geometry. Saturation magnetization (M s) and a remanence magnetization (M r) decreased from 29.77 to 20.78 emu/g and 21.62 to 15.79 emu/g, respectively, with increasing the Gd 3+ content. However, coercivity (H c) is significantly increased. The highest value of H c = 1132 Oe was found for y = 0.075 sample. The reduction in M s values can be justified owing to the replacement of Fe 3+ existing at the octahedral [B]-sites by the Gd 3+ ions which is paramagnetic at room temperature. The elucidation of magnetic parameters with Gd 3+ doping was attributed to the discrepancy of anisotropy constant, the paramagnetic nature of Gd 3+ and crystallite size effect.

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Section: Introductionmentioning

confidence: 99%

Sol–gel auto-ignition fabrication of Gd3+ incorporated Ni0.5Co0.5Fe2O4 multifunctional spinel ferrite nanocrystals and its impact on structural, optical and magnetic properties

Pawar¹,

Khirade

Vinayak³

et al. 2020

SN Appl. Sci.

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show abstract

“…For instance, the effect of addition of different surfactants such as agarose, starch, polystyrene, polyvinyl alcohol (PVA),, malic acid, hexamethylenetetramine (HMT), oxalyl dihydrazide (ODH), thiourea, ethylene glycol, citric acid, urea, glucose, and glycine has been investigated in order to optimize its physical and chemical properties. Moreover, the numerous studies have been done to modify morphology, size, and magnetic properties of CFO by doping the alloying elements such as V, Ni, Mn, Ti–Al, Ce, Zn, Gd, In, and rare earth elements . On the other hand, the most common methods which are used for the synthesis of CoFe 2 O 4 nanoparticles are co‐precipitation, solvothermal, hydrothermal, micro‐emulsion, and sol‐gel methods .…”

Section: Introductionmentioning

confidence: 99%

Effect of apple cider vinegar agent on the microstructure, phase evolution, and magnetic properties of CoFe₂O₄ magnetic nanoparticles

Afshari

Isfahani

Hasani

et al. 2019

Int J Applied Ceramic Tech

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In the present study, spinel structure CoFe2O4 nanoparticles were successfully synthesized by the sol‐gel auto‐combustion technique. The effect of apple cider vinegar (ACV) addition as an organic biocompatible agent on the size, morphology, and magnetic properties of CoFe2O4 nanoparticles was investigated in detail. The phase evolution, particle size, and lattice parameter changes of the synthesized phase have been estimated by using Rietveld structure refinement analysis of X‐ray powder diffraction data. Also, Fourier transform infrared spectra (FT‐IR) of the samples verified the presence of two expected bands correspond to tetrahedral and octahedral metal‐oxygen complexes within the spinel structure. Furthermore, microstructural observations revealed that ultrafine particles have a semi‐spherical morphology. It was shown that the particles size decreased from ~45 to ~17 nm with an increase in the amount of ACV. Magnetic properties were carried out by vibrating sample magnetometer (VSM) at room temperature. Both the saturation magnetization (Ms) and coercivity (Hc) were found to be significantly dependent on the crystallite size and the amount of ACV.

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“…Gas detection depends on various properties of material like optical, electrical, calorimetric etc and spinel ferrites possess all above mentioned characteristics and are superior as compared to the other materials like carbonaceous allotropes, carbon polymer composites, conducting polymers etc used as gas sensors [1][2][3]. Among inverse spinel ferrites, the most suitable ferrite used for gas sensor is nickel ferrite and is used for the detection of various gases like chlorine, acetone, NOx, CO, NH 3 , H 2 and H 2 O [4][5][6][7][8][9][10].…”

Section: Introductionmentioning

confidence: 99%

Tailoring of electrical properties in nanostructured (NiO)_0.25(Fe₂O₃)_0.75 composite and compound for sensing applications

Farooq

Anis-ur-Rehman

Haq

2019

Mater. Res. Express

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Compound and composite of the (NiO) 0.25 (Fe 2 O 3 ) 0.75 nanoparticles have been prepared by without water and surfactants (WOWS), Sol-gel method. Synthesized nanoparticles are calcined at 500°C/2 h and pellets are sintered at 550°C/1 h. The compound and composite showed cubic lattice and rhombohedral crystallographic lattices respectively. Morphological analysis is done by Scanning electron microscope and Transmission electron microscope. UV characterization was done to calculate band gap energies for both samples. DC electrical conductivity as a function temperature from 373.15 to 703.15 K was done by two-probe method. DC conductivity has been explained by hopping mechanism. Activation energies were calculated from Arrhenius plots. AC electrical properties namely; dielectric constant, dielectric loss tangent, ac conductivity and impedance were measured as a function of frequency (20 Hz-3 MHz). AC electrical properties were explained by Maxwell-Wegner model, Koop's theory and Johnsher's power law. Composite of (NiO) 0.25 (Fe 2 O 3 ) 0.75 showed enhanced properties as compared to compound.

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Nanocrystalline Ce doped CoFe2O4 as an acetone gas sensor

Cited by 79 publications

References 33 publications

Sol–gel auto-ignition fabrication of Gd3+ incorporated Ni0.5Co0.5Fe2O4 multifunctional spinel ferrite nanocrystals and its impact on structural, optical and magnetic properties

Sol–gel auto-ignition fabrication of Gd3+ incorporated Ni0.5Co0.5Fe2O4 multifunctional spinel ferrite nanocrystals and its impact on structural, optical and magnetic properties

Effect of apple cider vinegar agent on the microstructure, phase evolution, and magnetic properties of CoFe₂O₄ magnetic nanoparticles

Tailoring of electrical properties in nanostructured (NiO)_0.25(Fe₂O₃)_0.75 composite and compound for sensing applications

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Nanocrystalline Ce doped CoFe2O4 as an acetone gas sensor

Cited by 79 publications

References 33 publications

Sol–gel auto-ignition fabrication of Gd3+ incorporated Ni0.5Co0.5Fe2O4 multifunctional spinel ferrite nanocrystals and its impact on structural, optical and magnetic properties

Sol–gel auto-ignition fabrication of Gd3+ incorporated Ni0.5Co0.5Fe2O4 multifunctional spinel ferrite nanocrystals and its impact on structural, optical and magnetic properties

Effect of apple cider vinegar agent on the microstructure, phase evolution, and magnetic properties of CoFe2O4 magnetic nanoparticles

Tailoring of electrical properties in nanostructured (NiO)0.25(Fe2O3)0.75 composite and compound for sensing applications

Contact Info

Product

Resources

About

Effect of apple cider vinegar agent on the microstructure, phase evolution, and magnetic properties of CoFe₂O₄ magnetic nanoparticles

Tailoring of electrical properties in nanostructured (NiO)_0.25(Fe₂O₃)_0.75 composite and compound for sensing applications