Synthesis and Characterization of Nio Nanocrystals by using Sol-Gel Method with Various Precursors (original) (raw)

Sol-Gel Synthesis and Characterization of Nio Nanoparticles

Journal of Science and Technology, 2017

In order to study the roles of the crystallite size of an active phase in a catalytic reaction it is of utmost importance to be able to synthesize pure phases of crystallite in the desired size range with a narrow size distribution. The method to produce a nano of Nickel oxide ( ) is described. Nanoparticles (NPs) of are prepared by thermal decomposition of freshly prepared nickel hydroxide by a sol gel route at 300° .This sample is characterized by Xray diffractometer (XRD) and UV–visible spectroscopy. The average crystalline space or the separation between atomic planes of ( ) NPs is found to be about (2 5nm) and the average of particle size is (919 nm). According to our X-ray and neutron diffraction data, all NiO powders are antiferromagnetically ordered at room temperature. صلختسملا ف زفحملا لعافتلا نإ ةیونانلا تامیسجلا ةسارد ي ) ونانلا مجح يف ( ةیقن راوطأ ریضحتل يمظع ةیمهأ وذ طشنلا روطلا تاذ ةرولبلا نم ) قیقدلا ندعملا ( قیض يمجح عزوت يف دوشنم يمجح ىدم يف . اهب ترضح يتلا ةقیرطلا...

APPLICATION OF SOL-GEL METHOD FOR SYNTHESIS OF Ni ( OH ) 2 AND NiO NANOPARTICLES

2018

The sol-gel method was used for obtaining Ni(OH)2 and NiO. For structural characterization of the material we used XRay Diffraction (XRD). Morphological structures and chemical composition were examined by scanning electron microscopy (SEM.). The results obtained, it was found that the average particle size of the Ni(OH)2 is about 15.8 nm and the thermal treatment for calcination at 350° C obtain NiO particle size is 48.5 nm. The result of DSC analysis of the precursor product showed that the proper calcination temperature was 350°C.

Realizing NiO nanocrystals from a simple chemical method

Nanocrystalline NiO has been prepared successfully by a simple chemical route using NiCl2·6H2O and NaOH aqueous solution at a temperature of 70°C. The prepared material has been characterized from XRD, SEM, and M–H characteristics. It has been found that NiO nanocrystals have been formed which shows a superparamagnetic/superantiferromagnetic behaviour.

A simple route to the synthesis of high-quality NiO nanoparticles

Journal of Nanoparticle Research, 2007

Dispersed nickel oxide nanoparticles were obtained by a simple and low-cost method using a mixture of gelatin as organic precursor and NiCl 2 AE 6H 2 O as Ni source. The average particle size was estimated from X-ray powder diffraction (XRPD) peaks using the Rietveld refinement. The values ranged from 3.2 to 79 nm. We observed that the particle size changes as a function of synthesis time, with a notable decrease after the addition of NaOH to the solution. Field emission scanning electron microscopy (FE-SEM) measurements show that particles have well defined shapes and are dispersed in an organic matrix. X-ray absorption near edge spectroscopy (XANES) shows also the formation of fcc NiO nanoparticles structures.

Direct Solvothermal Synthesis of Phase-Pure Colloidal NiO Nanocrystals

Chemistry of Materials, 2020

Nickel (II) oxide (NiO) nanocrystals have potential applications in catalysis and photocatalysis and as precursors for nanostructured thin films of NiO used as photocathodes in dye-sensitized solar cells. Previously reported methods for synthesizing NiO nanocrystals typically produce Ni(OH)2 or Ni as an intermediate phase that is subsequently converted to NiO via calcination or oxidation. Here, we report a reproducible solvothermal method to access colloidal, monodisperse NiO nanocrystals of high optical quality from aminated nickel carboxylate precursor complexes in a single synthetic step at a low reaction temperature (180 ºC). The use of a tertiary alcohol, such as tert-butanol or tert-amyl alcohol, as a solvent and the presence of amines and a trace amount of water are all necessary for the formation of NiO. The high optical quality of these nanocrystals combined with the reproducibility and scalability of the synthesis will enable future spectroscopic and reactivity studies of colloidal NiO nanocrystals in the context of their optoelectronic and catalytic applications.

Structural and optical characterization of NiO nanoparticles synthesized by sol-gel route

Nucleation and Atmospheric Aerosols, 2012

We have successfully synthesized (Ni,Al) co-doped ZnO nanostructured powders via the sol-gel technique at low temperature. The elemental analysis confirms the incorporation of the Ni and Al ions into the ZnO matrix. The structural study revealed that the nanopowder samples are assembled in flower-shaped Zn 0.9-x Ni 0.1 Al x O nanostructures with average crystallite sizes ranging from 39 to 53 nm. The XRD patterns show that the Zn 0.9-x Ni 0.1 Al x O nanopowders have a hexagonal wurtzite polycrystalline structure. Weak diffraction peaks related mainly to nickel oxides are also detected in the samples. The highest crystallite size, lowest lattice parameters and unit cell volume are obtained for the nanopowder samples that contain 1.5 at.% of aluminum. The decomposition process of the dried gel system is investigated by thermogravimetric analysis (TGA). Raman scattering and FT-IR measurements confirm the wurtzite structure of the synthesized Zn 0.9-x Ni 0.1 Al x O nanopowders. The energy band gap of the synthesized nanopowders (~3.32 eV) was estimated by using the Brus equation and the crystallite sizes obtained from XRD data, for comparison. The strain in the nanopowder samples (~2.7 × 10-3) was also calculated according to the Stokes-Wilson equation.

Synthesis and characterization of NiO nanoparticles for electrochemical applications

Colloids and Surfaces A: Physicochemical and Engineering Aspects, 2012

Due to the outstanding electrical, magnetic and catalytic properties, nickel oxide (NiO) has been received considerable attention during the past decades. In this study, NiO nanoparticles were prepared by solgel method, which is one of the simplest and lowest-cost techniques. The synthesis was accomplished by using Poly(alkylene oxide) block copolymer as the surfactant, and Ni(NO 3) 2 •6H 2 O as the inorganic precursor. The effect of experimental parameters, such as calcination temperatures and H 2 O concentration on the NiO nanoparticles formation were investigated. TGA, XRD, SEM, TEM and N 2 adsorptiondesorption isotherms were used to characterize the microstructure and specific surface area of the samples. TGA and FTIR analyses demonstrated that copolymers were expelled at 573 K. The formation of NiO nanoparticles and their structural features were greatly dependent on the calcination temperature. The sample calcined at 923 K was composed of pure NiO nanoparticles as shown by XRD. As H 2 O concentration was increased, the reoxidation process of metallic Ni to form NiO would reduce, but it would not affect the structural type of NiO nanoparticles. In general, the addition of water would weaken and inhibit oxidation effects. The temperature of stable metallic Ni was increased up to 823 K. The specific surface area evaluated from the N 2 adsorptiondesorption indicated that the samples consisting of non-porous NiO nanoparticles. Increasing H 2 O addition resulted in an increase of specific surface area of nanocrystalline NiO powder.