Optical and electrochemical properties of nanosized NiO via thermal decomposition of nickel oxalate nanofibres

Wang, Xiong; Song, Jimei; Gao, Lifu; Jin, Jiaqi; Zheng, Huagui; Zhang, Zude

doi:10.1088/0957-4484/16/1/009

Cited by 179 publications

(80 citation statements)

References 15 publications

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“…18 Extensive studies have been reported over a last decade on particle size dependent magnetic properties [10][11][12] and finite size versus surface effects on magnetic properties, 19 effect of substitution, 20 and room temperature magnetic crossover [21][22][23][24] of NiO prepared by various techniques. A combined experimental and computation study carried out by Yi et al showed a remarkable size-dependent magnetism with large magnetization of 105 emu/g and ferromagnetic ordering temperature of 35 K, when the size of the NiO cluster is about 1 nm.…”

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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Section: Introductionmentioning

confidence: 99%

Enhanced room temperature ferromagnetism in antiferromagnetic NiO nanoparticles

2015

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“…Stoichiometric NiO at R.T is an insulator with a resistivity of 10 13 Ω cm.The electrical conductivity of NiO can be manipulated by changing the concentration of Ni ion during doping [2]. Nickel oxide has demonstrated excellent properties such as catalytic [3] , magnetic ,electrochromic ,optical and electrochemical properties [4]. Znic is a first transition element in group 2 .…”

Section: Introductionmentioning

confidence: 99%

Effect of Zn Doping on Structural and some Optical Studies of Nano NiO Films Prepared by Sol-Gel Technique

Hashim

Sami

2015

ILCPA

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ABSTACT. This research deals with the study of the structural andoptical properties of NiO and Zn doped NiO nano films with different ratios (0.01,0.05,0. 1mol %). NiO nano films in thickness 100nm were deposited on a glass substrate using sol-gel spin coating technique. XRD results indicated that the films are polycrystalline and have cubic structure with a preferred orientation along (111). The average grain sizes of the crystallites estimated from XRD data was found to lie in the range of 19. 11 -25.05 nm. Data of AFM indicate that the surface of films is smooth.The optical transmittance value of nano NiO film reaches to 94% in the VIS and NIR regions, while it is value of films deposited with 0.1mol%Zn reaches to (91)% which is important for its applications as window layers in solar cells. The values of optical energy gap of NiO and Zn doping by 0.01,0.05,and 0. 1 mol % were equal to 3.73, and 3.58,3.42, 3.41 eV respectively.

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“…The UV-Vis absorption peak was observed at 274 nm and the transmittance at 296 nm for the synthesized SrO NPs. The peak at 274 nm occurs due to the quantum size effect of monodispersed colloidal particles and the transmittance peak indicates the controlled size of particles and purity of the sample [28]. Athar reported the UV-Vis spectrum with broad spectrum at 265 nm and 290 nm which is due to the quantum size effect and surface morphology of the particles, respectively [11].…”

Section: Optical Propertiesmentioning

confidence: 96%

Biomimetic Synthesis and Antibacterial Properties of Strontium Oxide Nanoparticles Using Ocimum Sanctum Leaf Extract

Apsana¹,

Pp²,

Devanna

et al. 2018

Asian J Pharm Clin Res

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Objective: The investigation and synthesis of nanoparticles using green chemical methods is an emerging field due to ecologically derived materials. In the present study, the reaction under microwave irradiation technique is proposed for synthesizing the strontium oxide nanoparticles (SrO NPs) by reacting the strontium nitrate powder with Ocimum sanctum L. leaf extract followed by heat treatment at 500 o C for 2 h. Methods:The crystalline nature, size, and morphological structure of the SrO powder sample were characterized by techniques such as powder X-ray diffraction (PXRD), scanning electron microscopy, ultraviolet (UV)-Vis spectroscopy, Fourier-transform infrared spectroscopy (FTIR) and photoluminescence (PL) spectral analysis. To investigate the antibacterial properties of SrO NPs, pathogens such as Escherichia coli, Staphylococcus aureus, Pseudomonas aeruginosa, Proteus vulgaris, Klebsiella pneumonia, and Morganella morganii was tested in Mueller-Hinton disc diffusion method. Results:The particle size of the SrO NPs is calculated to be 42 nm using Debye-Scherrer equation. The SrO NPs exhibited absorption peak in the range of 250-350 nm centered at 274 nm in UV region. In addition, it is demonstrated that band gap energy was calculated to be 5.39 eV from Tauc's plot. The SrO NPs has shown the efficient antibacterial effect by inhibiting zone against Gram-negative bacteria. Conclusion:The main aim of the study is to synthesize cost-effective and eco-friendly green synthesis of SrO NPs from the OS (O. sanctum) leaf extract and their characterization. The mechanism for the formation of SrO NPs in the presence of eugenol as reducing agent is also discussed. The present green chemical approach using plant-based materials for the synthesis of nanoparticles enhances the eco-friendliness, compatibility, effectiveness, and reduces the toxicity.

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Optical and electrochemical properties of nanosized NiO via thermal decomposition of nickel oxalate nanofibres

Cited by 179 publications

References 15 publications

Enhanced room temperature ferromagnetism in antiferromagnetic NiO nanoparticles

Enhanced room temperature ferromagnetism in antiferromagnetic NiO nanoparticles

Effect of Zn Doping on Structural and some Optical Studies of Nano NiO Films Prepared by Sol-Gel Technique

Biomimetic Synthesis and Antibacterial Properties of Strontium Oxide Nanoparticles Using Ocimum Sanctum Leaf Extract

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