Studies on the structure and gas sensing properties of nickel–cobalt ferrite thin films prepared by spin coating

Nanoparticles with controllable sizes of ferrite spinel CoFe2O4 were formed by thermal treatment of cobalt-iron glycerolate. Thermal behavior during the heating was studied by differential thermal analysis combined with thermogravimetry. The precursor, as well as the prepared nanoparticles, were analyzed by a broad spectrum of analytic techniques (X-Ray photoelectron spectroscopy (XPS), X-Ray diffraction (XRD), Energy dispersive spectroscopy (EDS), Atomic absorption spectroscopy (AAS), Scanning electron microscopy (SEM), and Raman spectroscopy). The particle size of nanoparticles was obtained from Transmission electron microscopy and also calculated using Scherrer formula. A vibrating sample magnetometer (VSM) in a Physical Property Measurement System was used to analyze the magnetic properties of nanoparticles.

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“…The evolution of particle size with temperature is obvious. The acquired diffraction patterns are in good agreement to the literature [29,31]. …”

Section: Resultssupporting

confidence: 88%

“…The last peak was found at ~782.4 eV, this Co2p peak confirmed the presence of cobalt in the glycerolate. The observed positions for Co2p and Fe2p are in good agreement with the literature [29]. Chemical composition Co 1 Fe 1.80 C 42.06 O 25.57 (Co being fixed to 1) was calculated from the spectrum.…”

Section: Resultssupporting

confidence: 87%

Synthesis and Properties of Nanosized Stoichiometric Cobalt Ferrite Spinel

et al. 2018

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“…They have great potential for applications in medicine, for hyperthermia treatment, controlled drug delivery and biosensors, electronics, as humidity or gas sensor, magnetic field sensors, inductors and high frequency applications, as well as applications as catalysts and photocatalysts for various reactions or the removal of undesired pollutants . As a response to the large demand numerous techniques have been employed to obtained ferrites in nanoparticle form, thin and thick films, or controlled morphology such as nanocubes and nanorods .…”

Section: Introductionmentioning

confidence: 99%

Increased sensibility of mixed ferrite humidity sensors by subsequent heat treatment

Vîrlan

Tudorache

Pui

2017

Int J Applied Ceramic Tech

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The study presents the effects of different calcination temperatures on the size and morphology of mixed Co‐Ni ferrites, and the respective changes in the magnetic and electrical properties, with emphasis on their applicability as humidity sensors. The data suggests that the heat treatment does not significantly change the magnetic properties, but significant variations on the morphology of the nanoparticles, correlated with large changes in the electrical properties of the nanoparticles in terms of electrical permittivity and resistivity with electrical field frequency and humidity, with a clear influence of the calcination temperature over the sensibility of the materials to humidity.

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“…Nickel containing mixed metal oxide is one of the most attractive materials that have been widely investigated. Zn-doped NiFe 2 O 4 [12], NiMoO 4 [13], Ni x Mn 3−x O 4 [14], Ni x Zn 1−x Fe 2 O 4 [15], Ni 1−x Co x Fe 2 O 4 [16] are some examples of the mentioned materials where A site is occupied by Ni cations. Among them, nickel titanate has been investigated as a tribological coating to reduce friction and wear at high temperature [17][18][19][20].…”

Section: Introductionmentioning

confidence: 99%

CeO₂/NiTiO₃nanocomposites; synthesis, photoluminescence and magnetic behavior

Enhessari

Sakhaei

Salehabadi

et al. 2017

Materials Science-Poland

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Pure phase NiTiO 3 was obtained via a modified sol-gel method. Addition of CeO 2 in a modified oxidizing atmosphere in stearic acid at 750°C led to the growth of several nanoscaled Ce-rich phases. The formation of NiTiO 3 and CeO 2 /NiTiO 3 was strongly confirmed based on metal-oxygen and metal-metal absorption bands. The nanometric formation of crystals and narrow distribution of nanoparticles were confirmed by XRD and FE-SEM. The magnetic properties indicated weak ferromagnetic behavior of NiTiO 3 and paramagnetic behavior of CeO 2 /NiTiO 3 nanocomposites. The paramagnetic properties were improved gradually into superparamagnetic upon increasing CeO 2 domain to 30 mol%. It was observed that the current density can achieve 1 × 10 −9 A/cm 2 for the sample containing 30 mol% CeO 2 at an electrical field equal to 40 V/cm.

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Studies on the structure and gas sensing properties of nickel–cobalt ferrite thin films prepared by spin coating

Cited by 80 publications

References 26 publications

Synthesis and Properties of Nanosized Stoichiometric Cobalt Ferrite Spinel

Synthesis and Properties of Nanosized Stoichiometric Cobalt Ferrite Spinel

Increased sensibility of mixed ferrite humidity sensors by subsequent heat treatment

CeO₂/NiTiO₃nanocomposites; synthesis, photoluminescence and magnetic behavior

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Studies on the structure and gas sensing properties of nickel–cobalt ferrite thin films prepared by spin coating

Cited by 80 publications

References 26 publications

Synthesis and Properties of Nanosized Stoichiometric Cobalt Ferrite Spinel

Synthesis and Properties of Nanosized Stoichiometric Cobalt Ferrite Spinel

Increased sensibility of mixed ferrite humidity sensors by subsequent heat treatment

CeO2/NiTiO3nanocomposites; synthesis, photoluminescence and magnetic behavior

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CeO₂/NiTiO₃nanocomposites; synthesis, photoluminescence and magnetic behavior