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Functional Ionic Liquids Assisted Synthesis and Characterization of Metal Sulfide or Selenide

Author: LiKangFeng
Tutor: YingTaoKai
School: Zhejiang Normal University
Course: Organic Chemistry
Keywords: Functional ionic liquids Nanomaterials CdS Cadmium selenide Lead sulfide Optical Properties
CLC: TB383.1
Type: Master's thesis
Year: 2011
Downloads: 21
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Abstract


Inorganic micro / nano-materials with special mechanical, optical, electrical, magnetic, and biological characteristics and concern. As special performance greatly depends on the size and morphology of the material, so controllable preparation of various structural characteristics of the material, and to explore its potential applications, has become a research focus in recent years. Conventional synthetic methods mostly water and an organic solvent or a combination of additives to obtain the inorganic material having a specific structure and performance. Although the organic solvent in the synthesis method by virtue of their different physical-chemical properties of application is very broad, but low boiling point and high vapor pressure, toxicity and the low solubility of inorganics limits its range of applications, especially its high vapor pressure and high less toxic and has caused serious pollution to the environment. Looking for a low-toxicity, low vapor pressure, as well as the design and material instead of traditional organic substances used in material synthesis, it is very important. Ionic liquids (Ionic Liquids, abbreviated as ILs) is constituted by the organic cation and an inorganic or organic anion, the molten salt, and has a high thermal stability, excellent ion conductivity and thermal conductivity, and non-volatile, or \wide liquid-way adjustable solubility and design advantages, it appears a great solution to this problem and fit well with the future development of green chemistry theme. Examples of ionic liquids used in many fields of organic synthesis, catalysis, analysis, electrochemical, and separation is too numerous to mention, and research in the field of inorganic micro / nanomaterials synthesis is in the ascendant. The role it plays in the field of materials synthesis from a single solvent, the templating agent, or surface active agent to the substance of the several roles, both as a template and the precursor, and at the same time serve as solvents or reaction substrate. Synthesized in the conventional ionic liquids based on the three functions of the ionic liquid, and for the dendritic structure of cadmium sulfide (CdS), cadmium selenide (CdSe) the nanospheres and lead sulfide (PbS) nanosheet Synthesis , fully reflects the variety of auxiliary performance of the function of the ionic liquid. And the use of scanning electron microscopy (SEM), transmission electron microscopy (TEM), X--ray diffraction instrument (XRD), room temperature light induced luminescence spectrum analyzer (PL), Fourier transform infrared spectroscopy analyzer (FTIR) and UV - visible absorption spectrometer ( of the products were characterized by the UV-vis) and other means. (1), cadmium chloride (CdCl2) and butyl methylimidazolium thiocyanate ([BMIM] SCN) as the starting material, non-template hydrothermal prepared with special morphology of CdS dendritic structure. Experimental results show that the ionic liquid in the reaction not only play a role of surface active agent, and also as a reactant to provide a sulfur source, a good indication of the role of multiple roles, and gives the reaction mechanism. In addition, the special nature of the product on the morphology to exhibit photoluminescence performance with the dissimilarity of the bulk material. (2), butyl methylimidazolium chloride ([of the BMM] Cl), cadmium chloride (CDC12) and potassium thiocyanate (KSCN), at room temperature the reaction of a cadmium ion-containing ionic liquids ([BMIM] [Cd ( SCN) 3]) for the precursor, and then in aqueous solution with the selenomethionine sodium (NaSeSO3) synthesized by CdSe nanoparticles self-assembled nano-ball. Experimental study of the parameters such as reaction temperature, time and pH on the morphology and fluorescence properties. (3) Pb (NO3) 2 and thiourea (TA) as raw materials containing dual functional groups of glycine ionic liquid ([BMIM] Gly) assisted Hydrothermal Method stacked PbS nanocubes Nano tablets. The experimental results show that the morphology of the product can be controlled by changing the experimental parameters. In addition also gives the formation mechanism of PbS nanosheets polymerization stage is divided into three stages: the nucleation stage, the stage of crystal growth and the crystal itself. In addition PbS nanosheets exhibit fluorescence properties different from the previous reported.

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