One-pot Solvothermal Synthesis And Properties Of1D Nise, Ni₃S₂and NiSe-Ni₃S₂Alloyed Compound Nanorod Arrays

Nickel selenide is an important member of nickel chalcogenide, as a p-type semiconductor, NiSe can be used for fabrication of solar cells because of its desirable band gap of2.0eV. And has wide range of applications in the fields of electricity, optics, and magnetism. Nickel sulfide is a potential electrode material for lithium-ion battery. In particular, single crystalline Ni3S2is a good metallic conductor with a room temperature resistivity of about1.8×10-5Ω·cm leading to ease in transportation for electrons. Each constituent of the semiconductor composite have different dielectric constants and band gaps. It can produce new band gap and electronic energy level, and form a new electron-hole recombination center. Carriers compound path are changed, and then show stronger and higher function characteristics. Especially the one-dimensional multicomponent nanostructures, such as alloy nanowires and nanorods, it can produce more unique nature compared to each pure compound.The properties of nickel selenides sensitively depend on their compositions and morphologies. Therefore, it has important scientific significance and application value to develop some facile preparation methods to fabricate NiSe and its composite semiconductor nanomaterials with a particular crystal structure and morphologies.In this paper, a general one-pot solvothermal route was adopted to produce well-aligned NiSe, Ni3S2and NiSe-Ni3S2compounds nanorod arrays on Ni substrate. The growth mechanism of material show that metal foil was used as nickel source, and it also favored unidirectional diffusion of metal ions, resulting in the vertical growth of one dimensional nanostructures on the substrate. Different solvents and surfactants were used to study the influence on the morphology and structure of the products. Discuss the different amount of surfactant on the morphology changes of nanorods arrays. The structure, composition and morphology of as-prepared samples are carefully studied through a variety of modern analysis and test method. Investigate the distribution of the Ni, S and Se elements in the rod-like NiSe-Ni3S2products. The results showed the NiSe-Ni3S2composite was alloyed nanoheterostructure. And the possible growth mechanism for the alloyed compound nanostructure has been proposed. Comparative study the magnetic properties of NiSe, Ni3S2and NiSe-Ni3S2alloy compounds nanorod arrays. Magnetic characterization suggested that the obtained NiSe-Ni3S2nanoheterostructures transformed into paramagnetic behavior, and the magnetization intensity of the NiSe-Ni3S2sample lay between these two counterparts. The optical properties of the as-produced samples at room temperature were investigated, different original reactant ratio (S/Se) in determining the ultraviolet luminous intensity of the NiSe-Ni3S2alloyed compound have been carried out. Luminescence properties indicated that ultraviolet luminous intensity of the alloy materials could be significantly enhanced through doping Ni3S2into NiSe sample.