Synthesies And Properties Of Daul-Metal Iron (Copper) Molybdenum Sulfur Nanocrystals

In this thesis, the Mo-Fe-S nanocrystallines and Cu-Mo-S nanomaterials were prepared by thermal decomposition method and the one-pot method, respectively. The structures of obtained compounds were characterized by means of modern testing, and we also investigated the IV curve, magnetic and electrochemical properties of the sample, respectively. The effects of different preparation methods on the structures and properties were studied. The content and results are as follows:1. Synthesis and characterization of MoFeS₃ nanostructures prepared by precursor thermal decomposition.Using (Et4N) 2 [S₂MoS₂FeCl₂] as a precursor, MoFeS₃ nanocrystals was prepared by precursor thermal decomposition in the oleyamine. The morphology, composition and crystal structure of MoFeS₃ nanocrystals were characterized by Transmission electron microscopy (TEM), electron spectroscopy (EDS), X-ray photoelectron spectroscopy (XPS) and X-ray powder diffraction (XRD), respectively. I-V performance of the samples was investigated. The results showed that the reaction temperature has an obvious influence on the structure of MoFeS nanomaterials. The crystallinity of samples is good as the pyrolysis temperature.2. Synthesis and characterization of MoFeS₃ and MoFe₆S₈ nanostructures through one-pot reaction.The nanocrystalline MoFeS₃ and MoFe₆S₈ was prepared in the oleyamine using the "one-pot reaction" method, by FeCl₂·4H₂O as an iron source, and (Et₄N)₂MoS₄ as the sulfur and molybdenum source. The morphology and crystal structure of MoFeS₃ and MoFe₆S₈ were seriously influenced by reaction time, reaction temperature. The morphology and crystal structure of MoFeS₃ and MoFe₆S₈ were characterized by transmission electron microscopy (TEM), field emmision scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS) and X-ray powder diffraction (XRD), respectively. Moreover, the optical property of the MoFeS₃ and MoFe₆S₈, nanocrystals was evaluated by the UV absorption. We also performed magnetic and current voltage characterization. The electrochemical property of the sample was measured by the cyclic voltammetry. The results showed that the structure of MoFeS nanomaterials can control by the proportion of different reactants. Due to the electron transfer property of MoFeS nanocrystals, it can be potentially used for catalysis. 3. Synthesis and characterization of CuMoS nanostructures via the "one-pot reaction".The nanocrystalline CuMoS was prepared in the oleyamine using the "one-pot reaction", CuCl₂·2H₂O as an iron source, and (Et₄N)₂MoS₄ as the sulfur and molybdenum source. The morphology, composition and crystal structure of CuMoS nanocrystals were characterized by Transmission electron microscopy (TEM), electron spectroscopy (EDS), X-ray powder diffraction (XRD), respectively. We also performed magnetic and current voltage characterization. The electrochemical property of the sample was measured by the cyclic voltammetry. The results showed that the structure of CuMoS nanomaterials can be controlled by changing temperatures, the morphology of product is not significantly affected at reaction time. As the electron transfer performance of CuMoS nanocrystals, provides a possibility to be used for fixation nitrogen and catalysis.