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Synthesis and Properities of Iron Sulfide Nanomaterials

Author: WangXia
Tutor: WuSiXin
School: Henan University
Course: Inorganic Chemistry
Keywords: Iron-sulfur nanomaterials Preparation Morphology Electrical Properties Magnetic Properties
CLC: TB383.1
Type: Master's thesis
Year: 2011
Downloads: 89
Quote: 0
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Abstract


Iron-sulfur nano material has a very important purpose, especially iron-sulfur clusters in vivo electron transfer, substrate binding and activation of the ultra-high density magnetic storage, magnetic separation, catalyst, biomedicine, sensing important application value. Preparation of a non-toxic, magnetic iron-sulfur nanomaterials caused widespread concern. Due to the iron-sulfur compound is unstable in air, the preparation conditions are relatively harsh, it must be prepared under anaerobic conditions, so the use of a simple synthetic method to prepare the iron-sulfur nanomaterials has a very important significance. In this paper, we use organic precursor lysis method, hot injection method and thermal decomposition method successfully prepared a series morphology of iron sulfide nanomaterials, and the structure and morphology characterization of the resulting samples using a variety of modern testing methods investigated the nature of the magnetic and electrical properties of the sample. In this thesis, the content and the results are as follows: 1. The controlled morphologies iron sulfur nanomaterials synthesis and properties of our cracking through the use of oleylamine the unit organic precursor method successfully prepared Fe7S8 nanomaterials. By SEM analysis, the iron source and a sulfur source has an important influence on the particle size and morphology of the product prepared. We merely by changing the source of iron and reaction time, synthetic three different morphologies Fe7S8 nanomaterials are dendritic, wheat-like, hexagonal nano flaky. The results show that self-assemble into three different morphologies of samples by magnetic and electrical properties of the prima facie evidence, transformed by the paramagnetic ferromagnetic aptitude, the Fe7S8 nanomaterials dendritic conductivity than wheat-like, hexagonal nano-sheet high about three orders of magnitude. 2 hot injection prepared iron-sulfur nanomaterials we use a simple hot-injection synthesis step successfully synthesized pyrrhotite Fe7S8 and sulfur complex iron ore Fe3S4 nanomaterials. From TEM analysis of the results, we can conclude that, when Fe (NO3) 3.9 H2O as an iron source temperature on the morphology and particle size of the product has important implications; by XRD analysis when FeCl3 · 6H2O as iron source The reaction temperature plays an important role in the crystal structure of the product nanosheet. When temperature increases, within the range of temperature of 180 ° C to 260 ℃ cubic system Fe3S4 transition to a hexagonal crystal system Fe7S8; further magnetic analysis showed that the magnetic properties of the product is not only related to the crystal structure, and there are elements of the sample related to the ratio; we also on the electrical properties of the samples were analyzed, the results show that: the that Fe7S8 sample is about an order of magnitude higher than Fe3S4 sample conductivity. Thermal decomposition of prepared iron-sulfur nano material the use of hexadecyl xanthate iron of the iron-sulfur nanomaterials as the precursor, the use of environmentally friendly thermal decomposition method successfully prepared. Sample decomposition preparation process does not require adding any solvent, no inert gas protection. Through analysis of experimental results, we found that the important influence of temperature on the morphology of the samples.

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