Comparative investigation of NiO nano- and microstructures for structural, optical and magnetic properties

Manikandan, A.; Vijaya, J. Judith; Kennedy, L. John

doi:10.1016/j.physe.2013.02.013

Cited by 83 publications

(22 citation statements)

References 46 publications

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“…It is known that the amount of heat supplied is the main factor for crystal growth . By supplying a high amount of heat, agglomerations tend to occur to minimize their surface free energy . This resulted in the formation of bigger particle sizes at higher temperature due to higher rate of agglomerations.…”

Section: Resultssupporting

confidence: 91%

“…51 By supplying a high amount of heat, agglomerations tend to occur to minimize their surface free energy. 52 This resulted in the formation of bigger particle sizes at higher temperature due to higher rate of agglomerations. Furthermore, the increase in particle size could also be explained by the greater loss of oxygen at high calcination temperatures.…”

Section: Resultsmentioning

confidence: 99%

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Synthesis and Characterization of NiO Nano‐Spheres by Templating on Chitosan as a Green Precursor

et al. 2016

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In this study, nickel oxide was prepared through the calcination of extrusion dripped chitosan/nickel nitrate beads. The morphology and structural properties of the products were studied using various characterization techniques. Uniformly distributed nickel oxide was formed as observed from the studies of surface morphology where the processing parameters play a huge role on the resulting morphology. TEM results have shown that nickel oxide with crystallite sizes of 10–30 nm was obtained. The Fourier-transform infrared spectra studies show an intense peak at 525 cm−1, which is attributed to the vibration of Ni–O bond. Furthermore, the XRD results show NiO diffraction peaks correspond to (111), (200), (220), (311), and (222) which indicates that a bunsenite structure with a face-centered cubic phase was produced in this study. The usage of 500°C as the lower limit in this study is justified due to the complete removal of the templating material as seen in the thermalgravimetric analysis studies. Furthermore, it was obtained that the largest surface area of nickel oxide synthesized using this technique is 48.024 m2/g with pore sizes of 19.843 nm. The usage of chitosan as a green template for the synthesis of nanoparticles has shown promising results which allows a more economical and sustainable approach for the fabrication of nanomaterials

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Section: Resultssupporting

confidence: 91%

Section: Resultsmentioning

confidence: 99%

Synthesis and Characterization of NiO Nano‐Spheres by Templating on Chitosan as a Green Precursor

et al. 2016

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“…On the other hand, as a result of the large increase in the crystallite size of the synthesized materialsa at F/O 4:1 using glycine, the corresponding specific surface area is expected to be drastically reduced (25) . Compared with the reported crystallite size ,surface area and weight fraction of NiO nanoparticles prepared by different methods, solution-phase (26) , solution combustion (25,27) , solvothermal (28) and microwave combustion (27) ,our sample synthesized at 400 •C with F/O 4:1 using urea is much enhanced as shown in Table 4.…”

Section: Phase Formation With Different Ratios Of Fuel To Nitrate At mentioning

confidence: 82%

Single Step Solid Combustion Route for Preparing Nanosized NiO.

2014

Egypt. J. Chem.

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“…The growth mechanism may involve three steps, such as combustion synthesis of NiO, carbothermal reduction of NiO to Ni-rich vapors/ions, and re-oxidation of Ni-rich vapors/ions to NiO nanoparticles [41]. The combustion synthesis that could have taken place inside the microwave oven is enumerated as follows [42]:…”

Section: X-ray Diffraction Analysismentioning

confidence: 99%

Synergy effect in the photocatalytic degradation of textile dyeing waste water by using microwave combustion synthesized nickel oxide supported activated carbon

Suresh¹,

Vijaya²,

Balasubramaniam³

et al. 2014

Desalination and Water Treatment

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A B S T R A C TNickel oxide nanoparticles supported activated carbon (NSAC) photocatalyst was successfully prepared using a cost-effective microwave irradiation method. The earned UV lightsensitive NSAC composites were characterized using powder X-ray diffraction, Fourier transform infrared spectroscopy, High-resolution scanning electron microscope with energydispersive X-ray analysis, X-ray photoelectron spectroscopy, and Brunauer-Emmett-Teller surface area analyzer. Optical properties of NSAC composites were investigated using UVVis diffuse reflectance spectroscopy and photoluminescence spectroscopy, which exposed prolonged light absorption in UV light region and hold better charge separation capability, respectively, as compared to pure NiO. The photocatalytic activity was tested by the degradation of textile dye waste water (TDW) under UV light irradiation. Chemical oxygen demand of TDW was calibrated before and after the photocatalysis experiment under UV light to evaluate the mineralization of wastewater. The results demonstrated that NSAC composites showed imposing photocatalytic enrichment over pure NiO. The coordinated blending of the oxygen vacant sites, structural defects of NiO along with electron transmission capacity, and presence of surface oxygen on AC has led to the lasting light absorption, delayed charge recombination, and sustenance, which favor the enrichment of the photocatalytic activity of NSAC.

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Comparative investigation of NiO nano- and microstructures for structural, optical and magnetic properties

Cited by 83 publications

References 46 publications

Synthesis and Characterization of NiO Nano‐Spheres by Templating on Chitosan as a Green Precursor

Synthesis and Characterization of NiO Nano‐Spheres by Templating on Chitosan as a Green Precursor

Single Step Solid Combustion Route for Preparing Nanosized NiO.

Synergy effect in the photocatalytic degradation of textile dyeing waste water by using microwave combustion synthesized nickel oxide supported activated carbon

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