Experimental study on synthesis of NiO nano-particles

Liu, Xiang; Deng, X.Y.; Ye, Jin

doi:10.1016/s1359-6462(02)00108-2

Cited by 150 publications

(74 citation statements)

References 6 publications

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“…It was reported that NiO nanoparticles synthesised in a similar manner could grow up to 13 nm in diameter, even though the precursor was calcined at 400°C [19]. The size of NiO nanoparticles in the nanocomposite was less than a half of them.…”

Section: Original Research Papermentioning

confidence: 97%

Fine‐microstructure Mediated Efficient Hydrogen Oxidation in Ni/YSZ Anode Fabricated from Novel Co‐precipitation Derived Nanocomposites

2010

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Fine‐microstructure mediated efficient hydrogen oxidation was demonstrated on nickel/yttria‐stabilised zirconia (Ni/YSZ) anode fabricated from NiO/YSZ nanocomposite particles, synthesised via a novel co‐precipitation method using YSZ nanoparticles with the average size of 3 nm. Transmission electron microscopy image revealed that nanocomposite particles calcined at 600 °C consisted of homogeneously distributed NiO and YSZ nanocrystals, approximately 5 nm large. The Ni/YSZ anode was fabricated by sintering the screen‐printed nanocomposites at 1,300 °C and their subsequent reduction. The anode had a uniform porous microstructure consisting of fine grains in the range of 200–300 nm, and exhibited quite low area‐specific resistance (ASR) of 2.29, 0.43 and 0.15 Ω cm2 at 600, 700 and 800 °C, respectively.

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Section: Original Research Papermentioning

confidence: 97%

Fine‐microstructure Mediated Efficient Hydrogen Oxidation in Ni/YSZ Anode Fabricated from Novel Co‐precipitation Derived Nanocomposites

2010

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“…14 Among various magnetic nanoparticles, nickel oxide (NiO) have attracted much attention due to size dependent crystal structure, vibration modes and magnetic properties, and its applications in catalysis, energy conversion, storage devices, battery cathodes, antiferromagnetic (AFM) layer, gas sensors, electrochromic films, and transparent conducting films. 15,16 In addition, the development of NiO based nanoparticles and thin films were focused to obtain ferromagnetism (FM) above room temperature such that these oxides with cubic structure could easily facilitate integration of spintronic devices. Bulk NiO exhibits a cubic structure with a Néel temperature (T N ) of 523 K. However, Néel 17 suggested that fine particles of AFM nature should exhibit either a weak FM or superparamagnetism (SPM).…”

Section: Introductionmentioning

confidence: 99%

Enhanced room temperature ferromagnetism in antiferromagnetic NiO nanoparticles

2015

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We report systematic investigations of structural, vibrational, resonance and magnetic properties of nanoscale NiO powders prepared by ball milling process under different milling speeds for 30 hours of milling. Structural properties revealed that both pure NiO and as-milled NiO powders exhibit face centered cubic structure, but average crystallite size decreases to around 11 nm along with significant increase in strain with increasing milling speed. Vibrational properties show the enhancement in the intensity of one-phonon longitudinal optical (LO) band and disappearance of two-magnon band due to size reduction. In addition, two-phonon LO band exhibits red shift due to size-induced phonon confinement effect and surface relaxation. Pure NiO powder exhibit antiferromagnetic nature, which transforms into induced ferromagnetic after size reduction. The average magnetization at room temperature increases with decreasing the crystallite size and a maximum moment of 0.016 μB/f.u. at 12 kOe applied field and coercivity of 170 Oe were obtained for 30 hours milled NiO powders at 600 rotation per minute milling speed. The change in the magnetic properties is also supported by the vibrational properties. Thermomagnetization measurements at high temperature reveal a well-defined magnetic phase transition at high temperature (TC) around 780 K due to induced ferromagnetic phase. Electron paramagnetic resonance (EPR) studies reveal a good agreement between the EPR results and magnetic properties. The observed results are described on the basis of crystallite size variation, defect density, large strain, oxidation/reduction of Ni and interaction between uncompensated surfaces and particle core with lattice expansion. The obtained results suggest that nanoscale NiO powders with high TC and moderate magnetic moment at room temperature with cubic structure would be useful to expedite for spintronic devices.

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“…In the literature, various methods have been reported for the synthesis of nanocrystalline NiO from different starting materials for some valuable applications. Most of these methods are; thermal decomposition [21,22], carbonyl method, sol-gel technique [23], microwave pyrolysis [24], solvothermal [25], anodic arc plasma [26], Sonochemical [27], precipitation-calcination [28] and microemulsion [29]. However, mostly these are high-temperature and high-pressure methods; rely on surface-capping agents or demand for organic-metallic precursors and seems to be expensive for an industrial scale application.…”

Section: Introductionmentioning

confidence: 99%

Synthesis of Pyramid-Shaped NiO Nanostructures using Low-Temperature Composite- Hydroxide- Mediated Approach

Shahid¹,

Khan²,

Zakria³

et al. 2016

J Material Sci Eng

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Composite-hydroxide-mediated (CHM) approach was used to synthesize NiO nanocrystals. The proposed method makes use of molten composite hydroxides; providing reaction media and lower the process temperature. Processing temperature and reaction time are the two potential parameters to control the growth of a nanomaterial. The method was used at temperatures in the range of 180-250°C and formation of the nanomaterial was monitored using XRD, SEM, EDX, FTIR, and UV-visible spectroscopy. The produced nanomaterial was purely polycrystalline with an average crystallite size in the range of 23.71-36.92 nm. Method suggested formation of pyramid shaped NiO nanocrystals in the temperature range 220-250°C. Evidence on the elemental composition, purity, and chemical bonding were obtained from EDX and FTIR analysis respectively. Estimation on direct bandgap was made from the optical analysis and found to be in the range 4.0-4.8 eV. The method is attractive and seems a cost effective route for the growth of transition metal oxides for research purpose. For further efficacy, the approach can be examined for other technologically significant nanostructures.

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Experimental study on synthesis of NiO nano-particles

Cited by 150 publications

References 6 publications

Fine‐microstructure Mediated Efficient Hydrogen Oxidation in Ni/YSZ Anode Fabricated from Novel Co‐precipitation Derived Nanocomposites

Fine‐microstructure Mediated Efficient Hydrogen Oxidation in Ni/YSZ Anode Fabricated from Novel Co‐precipitation Derived Nanocomposites

Enhanced room temperature ferromagnetism in antiferromagnetic NiO nanoparticles

Synthesis of Pyramid-Shaped NiO Nanostructures using Low-Temperature Composite- Hydroxide- Mediated Approach

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