Facile synthesis of Ni/NiO nanocomposites via thermal decomposition (original) (raw)
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In this paper, plate-like NiO nanoparticles were prepared by one-pot solid-state thermal decomposition of nickel (II) Schiff base complex as new precursor. First, the nickel (II) Schiff base precursor was prepared by solid-state grinding using nickel (II) nitrate hexahydrate, Ni(NO3)2∙6H2O, and the Schiff base ligand N,N′-bis-(salicylidene) benzene-1,4-diamine) for 30 min without using any solvent, catalyst, template or surfactant. It was characterized by Fourier Transform Infrared spectroscopy (FT-IR) and elemental analysis (CHN). The resultant solid was subsequently annealed in the electrical furnace at 450 °C for 3 h in air atmosphere. Nanoparticles of NiO were produced and characterized by X-ray powder diffraction (XRD) at 2θ degree 0-140°, FT-IR spectroscopy, scanning electron microscopy (SEM) and transmission electron microscopy (TEM). The XRD and FT-IR results showed that the product is pure and has good crystallinity with cubic structure because no characteristic peaks of im...
2014
Ni/NiO nanopowders with different metal and oxide phase ratio have been prepared by using thermal decomposition of nickel acetate ammine complexes which contain various ammonia concentrations at the temperature range 300 – 500 oC in air. Obtained powders have been characterized by IR-spectroscopy, XRD and TG, DTA, DTG, TEM, laser granulometry, adsorption-structural method and layer-by-layer Auger analysis. Thermal decomposition of nickel ammine complexes occurred with formation of crystalline hydroxide containing and amorphous carbonate containing precursors. Changing of precursors composition with different NH 3 content and annealing duration and temperature leads to different pore structure, agglomerate size of powders and determinates free and fixed carbon concentrations. Mean crystallite size of nickel depended on temperature only. In the temperature range from 350 to 500 °С the crystallite size of nickel has grown from 50 to 55 nm. Mean crystallite size of nickel oxide depended...
International Nano Letters, 2014
To raise the need of new precursors in the synthesis of NiO nanoparticles, mononuclear nickel(II) Schiff base complexes, viz. Ni(salbn) and Ni(Me 2-salpn), were employed as precursor in solid-state thermal decomposition. Structure, purity and morphology of these nanoparticles have been examined by Fourier transform infrared spectroscopy, X-ray powder diffraction, scanning electron microscopy and transmission electron microscopy (TEM). TEM analysis reveals that the synthesized nanoparticles have cubic particles with an average diameter of around 5-15 nm. This method is simple, less costly, and fast and safe for production of NiO nanoparticles in industrial applications.
Synthesis and Characterization of NiO Nanoparticles by Thermal Decomposition Method
Nickel oxide (NiO) nanoparticles were prepared by Thermal Decomposition method. Thermal decomposition or thermolysis is a chemical decomposition caused by heat. Thermal decomposition was thoroughly studied in order to control the particles size of the as-prepared NiO Nano powders. Transition metal oxides and metals have been researched extensively due to their interesting catalytic, electronic and magnetic properties. It has more applications like electro chromic coatings, plastics, textiles, nanowires, Nano fibers and specific alloy and catalyst applications. It is also used in active optical filters, ceramic structure, p-type transparent conductive films and energy efficient smart windows. The synthesized nickel oxide (NiO) nanoparticles were subjects to various studies like X-ray diffraction (XRD) technique and Fourier Transfer Infrared spectroscopy (FTIR).
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.
Süleyman Demirel Üniversitesi Fen Bilimleri Enstitüsü Dergisi, 2022
Five different Nickel (II) complexes were prepared using a ONNO type Schiff base bis-N;N'(salicylidene)-1,3-propanediamine (LH2) and an ONO type Schiff base N(2-hydroxy)salicylaldimine (SAPH2) in the presence of NH3 or amine and NiO nanoparticles were obtained with thermal decomposition of this complexes in air. The prepared complexes and Schiff bases have been characterized by element analysis, IR spectroscopy, Thermogravimetry (TG), 1 HNMR and 13 CNMR spectroscopy, Mass Spectrometry (MS), Atomic absorption spectrometry (AAS), and Scanning Electron Microscopy (SEM). The surface area of the obtained nanoparticle NiO material was measured by the Brunauer-Emmett-Teller (BET) method. The thermal decomposition products NiO nanoparticles were investigated with XRD, and SEM technics. SEM investigations showed that due to the very little solubility of the prepared two complexes and consequently they were precipitated in the form of nanoparticles. In addition, it observed that this very insoluble complexes are converted to NiO nanoparticles a result of thermal decomposition.