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Synthesis and characterization of a nickel selenide series via a hydrothermal process

Author:
Sobhani, Azam   Salavati-Niasari, Masoud  


Journal:
Superlattices and Microstructures


Issue Date:
2014


Abstract(summary):

A series of nickel selenides (NiSe and NiSe2) has been successfully synthesized from the reaction of SeCl4 with NiCl2 center dot 6H(2)O in the presence of cetyltrimethyl ammonium bromide (CTAB) as surfactant and hydrazine hydrate (N2H4 center dot H2O) as reductant at 180 degrees C for 12 h through a simple hydrothermal method. The morphology, phase structure and composition of NixSey can be controlled by adjusting the Ni/Se ratio of the raw materials, the quantity of reductant, the reaction temperature and so forth. The products were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM) and energy-dispersive X-ray spectroscopy (EDS) analysis. It was found that when the ratio of Ni/Se is 1:1 or 3:2, flower-like assemblies of NiSe nano-sheets are formed, at 180 degrees C for 12 h. When the ratio of Ni/Se is 1:2 at 180 degrees C, the products are found to be the mixture of hexagonal NiSe and cubic NiSe2. With decrease of nickel content in molar ratio of 1:2 (Ni:Se), nanospheres are agglomerated and microstructures are formed. With the reaction temperature decreasing from 180 degrees C to 120 degrees C, we reach pure NiSe2 nanoparticles. The formation mechanism of the nickel selenides has been investigated in detail by means of XRD and SEM analyses. (C) 2013 Elsevier Ltd. All rights reserved.


Page:
79-90


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