Synthesis of CuO@NiO core-shell nanoparticles by homogeneous precipitation method

Bayal, Nisha; Jeevanandam, P.

doi:10.1016/j.jallcom.2012.05.086

Cited by 69 publications

(23 citation statements)

References 71 publications

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“…The presence of band at around 1390 cm -1 is ascribed to the trapped nitrates. The absorption band around 1630 cm -1 , which exists in all the composites, is assigned to bending vibrational modes of water molecules [47]. The absorption peak lying around 3390 cm -1 is ascribed to the stretching vibrations of weakly bound water molecules.…”

Section: Ftir Spectral Analysismentioning

confidence: 92%

BiFeO3–CoFe2O4–PbTiO3 composites: structural, multiferroic, and optical characteristics

2014

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Three-phase magnetoelectric composites (1 -x) (0.7BiFeO 3 -0.3CoFe 2 O 4 )-xPbTiO 3 (or equivalently written as (1 -x)(0.7BFO-0.3CFO)-xPT) with x variations 0, 0.30, 0.35, 0.40, 0.45, and 1.0 were synthesized using hybrid processing route. The effects of PT addition on structural, multiferroic, and optical properties have been subsequently investigated. A detailed Rietveld refinement analysis of X-ray diffraction patterns has been performed, which confirms the presence of structural phases of individual constituents in the composites. Field emission scanning electron microscopy images are taken for microstructural analysis and grain size determination. Transmission electron microscopy analysis of 0.3CFO-0.7BFO reveals the average particle size to be lying in the window of 10-15 nm. The temperature-dependent dielectric constant at various frequencies (1, 10, 50, 100, and 500 kHz) has been studied, and the dielectric study reveals the increase of dielectric constant and decrease of average dielectric loss of composites with incorporation of PT content. Room temperature ferromagnetic behavior of composites is confirmed through the observation of magnetization versus magnetic field (M-H) hysteresis loops. The variation of magnetization with temperature indicates the presence of spin glass behavior in composites. Magnetoelectric coupling is evidenced in the composites through the observation of dependence of the dielectric constant on magnetic field, and magnetodielectric response of 2.05 % is observed for 45 mol% addition of PT content. The fractional change of magnetic field-induced dielectric constant can also be expressed as De r * cM 2 , and the value of c is found to be *1.08 9 10 -2 (emu/g) -2 for composite with x = 0.40. Fourier transformed infrared spectroscopy of samples is carried out to analyze various bonds formation in the composites.

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Section: Ftir Spectral Analysismentioning

confidence: 92%

BiFeO3–CoFe2O4–PbTiO3 composites: structural, multiferroic, and optical characteristics

2014

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“…Based on the literature, the combination of metals or metal oxides in a common matrix can result in materials with new structures and superior properties . To obtain these nanosized materials different procedures such as impregnation, sol–gel, sonochemical, hydrothermal, thermal decomposition and chemical vapor deposition have been utilized …”

Section: Introductionmentioning

confidence: 99%

“…Based on the literature, the combination of metals or metal oxides in a common matrix can result in materials with new structures and superior properties. [10] To obtain these nanosized materials different procedures such as impregnation, sol-gel, sonochemical, hydrothermal, thermal decomposition and chemical vapor deposition have been utilized. [11][12][13][14][15][16][17] Numerous reports are accessible on the application of metal and metal oxides nanocatalysts, for the reduction of nitroaromatic compounds in the presence of NaBH 4.…”

Section: Introductionmentioning

confidence: 99%

“…[43] NiO nanoparticles also exhibit catalytic activity for the reduction of nitrophenol in excess NaBH 4 solution. [10,[44][45][46][47][48] Its combination with other free metals or metal oxides for nitrophenol reduction has been reported. [10,46] Newly, the catalytic reduction of nitroaromatic compounds in excess NaBH 4 solution has attracted significant attention because the reductive product has wide applications in many industries.…”

Section: Introductionmentioning

confidence: 99%

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Nano NiO/AlMCM‐41, a green synergistic, highly efficient and recyclable catalyst for the reduction of nitrophenols

Derikvand

Rahmati

Azadbakht

2019

Applied Organom Chemis

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Highly ordered mesoporous molecular sieves AlMCM‐41 and a new NiO/AlMCM‐41 nanocomposite were synthesized using a sol–gel method. Fourier transform infrared (FT‐IR) spectroscopy, X‐ray diffraction (XRD), transmission electron microscopy (TEM), scanning electron microscopy (SEM), energy dispersive X‐ray spectroscopy (EDX), and N2 adsorption desorption analyses were used to examine the structure, morphology, size and phase composition of the synthesized NiO/AlMCM‐41 nanocomposites. AlMCM‐41 embedded with NiO nanoparticles was subsequently prepared using different nickel loadings in a direct synthetic route. The results show the successful deposition of NiO nanoparticles onto the framework of AlMCM‐41. AlMCM‐41 provides enormous benefits such as environmentally safe, economic viability and porosity when used as support for NiO nanoparticles. The excellent catalytic activities of AlMCM‐41 and NiO/AlMCM‐41 were investigated for the reduction of nitrophenols (4‐NP, 2‐NP) to aminophenols (4‐AP, 2‐AP) in water at ambient temperature. The best observed performance of reduction of NP with 100% conversion into analogous amino derivatives occurred within 6 min with an estimated rate constant of 0.46 min−1. The efficiency of reduction was observed to increase as a function of NiO enrichment. The NiO/AlMCM‐41 nanocomposite could be recycled and reused up to five times without noticeable change in its structure and activity. These properties make NiO/AlMCM‐41 nanocomposite an ideal platform to study various heterogeneous catalytic processes which can have application in purification, catalysis, sensing devices, and green chemistry.

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“…Among chemical routes, precipitation as a simple and low cost method has been widely used for synthesizing mono‐dispersed ultrafine particles . It was also reported that core–shell CuO@NiO and Li 4 Ti 5 O 12 @CeO 2 nanoparticles had been synthesized by coprecipitation method. Moreover, oleic acid is usually used a surfactant to prevent the aggregation of nanoparticles .…”

Section: Introductionmentioning

confidence: 99%

Enhanced Dielectric Properties of Ba_0.5Sr_0.5TiO₃/MgO Composites Prepared by Coprecipitation Derived Core–Shell Powders

Zhang

et al. 2015

J. Am. Ceram. Soc.

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Ba 0.5 Sr 0.5 TiO 3 /MgO (BST/MgO) composite ceramics have been prepared in situ by using an oxalate precipitation process. SEM and TEM images show that oleic acid modified BST/ MgO nanocomposite exhibits helminth-like particles consisting of BST core and MgO shell. Results reveal that oleic acid modification is chemisorbed on MgO particles as a carboxylate to form MgO shell, which connects to interparticles. Accordingly, the BST particles are well surrounded naturally by a thin MgO layer in the composite ceramics. As a result, the oleic acid modified BST/MgO composite ceramics shows better dielectric properties, with permittivity of 203, loss tangent of 0.0025 (at 2.4 GHz), and tunability of 10.2%.

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Synthesis of CuO@NiO core-shell nanoparticles by homogeneous precipitation method

Cited by 69 publications

References 71 publications

BiFeO3–CoFe2O4–PbTiO3 composites: structural, multiferroic, and optical characteristics

BiFeO3–CoFe2O4–PbTiO3 composites: structural, multiferroic, and optical characteristics

Nano NiO/AlMCM‐41, a green synergistic, highly efficient and recyclable catalyst for the reduction of nitrophenols

Enhanced Dielectric Properties of Ba_0.5Sr_0.5TiO₃/MgO Composites Prepared by Coprecipitation Derived Core–Shell Powders

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Synthesis of CuO@NiO core-shell nanoparticles by homogeneous precipitation method

Cited by 69 publications

References 71 publications

BiFeO3–CoFe2O4–PbTiO3 composites: structural, multiferroic, and optical characteristics

BiFeO3–CoFe2O4–PbTiO3 composites: structural, multiferroic, and optical characteristics

Nano NiO/AlMCM‐41, a green synergistic, highly efficient and recyclable catalyst for the reduction of nitrophenols

Enhanced Dielectric Properties of Ba0.5Sr0.5TiO3/MgO Composites Prepared by Coprecipitation Derived Core–Shell Powders

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Enhanced Dielectric Properties of Ba_0.5Sr_0.5TiO₃/MgO Composites Prepared by Coprecipitation Derived Core–Shell Powders