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Controlled Hydrothermal Synthesis and Structural Characterization of a Nickel Selenide Series
Author(s) -
Zhuang Zhongbin,
Peng Qing,
Zhuang Jing,
Wang Xun,
Li Yadong
Publication year - 2005
Publication title -
chemistry – a european journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.687
H-Index - 242
eISSN - 1521-3765
pISSN - 0947-6539
DOI - 10.1002/chem.200500724
Subject(s) - nickel , hydrothermal circulation , materials science , nucleation , scanning electron microscope , aqueous solution , hydrothermal synthesis , selenide , chemical engineering , phase (matter) , metal , nanotechnology , selenium , chemistry , metallurgy , composite material , organic chemistry , engineering
A series of nickel selenides (NiSe 2 microcrystals, Ni 1− x Se and Ni 3 Se 2 microspheres) has been successfully synthesized through a convenient, low‐temperature hydrothermal method. A good nucleation and growth environment has been created by forming a uniform and transparent solution reaction system. The compositions (including the x value of Ni 1− x Se), phase structures, as well as the morphologies of nickel selenides, can be controlled by adjusting the Ni/Se ratio of the raw materials, the pH, the reaction temperatures and times, and so forth. The newly produced Se microspheres in the system have been used as both reactant and in situ template to the Ni 1− x Se microspheres. It is found that Ni 1− x Se microspheres act as the intermediate precursor during the formation of Ni 3 Se 2 microspheres. Under certain conditions, hexagonal NiSe microspheres can be converted into rhombohedral NiSe nanowires in solution. The formation mechanisms of a series of nickel selenides has been investigated in detail by means of X‐ray diffraction (XRD) and scanning electron microscopy (SEM) analyses. This work has provided a general, simple, and effective method to control the composition, phase structure, and morphology of metal selenides in aqueous solution, which will be important for inorganic synthesis methodology and further applications of selenides.