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Study on the Preparation of Several Nano-semiconductors Using Ionic Liquids

Author: TaoXiaoJun
Tutor: WuYongZhong
School: Shandong University
Course: Materials Science
Keywords: CdS ZnS PbTe Ionic liquid Microwave Nanomaterials Controllable Preparation
CLC: TB383.1
Type: Master's thesis
Year: 2011
Downloads: 44
Quote: 0
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Abstract


Nanomaterials There are many ways, such as fumed, template method, microwave method. However, some method requires the use of volatile organic solvents or require more severe reaction conditions, which cause environmental pollution and increase production costs. Thus, the solvent may be used as a green ionic liquid to replace the volatile organic solvent as the reaction nanofabrication media. Explore ionic liquids in nanofabrication applications, is conducive to the development of a process is simple, environmentally friendly green preparation method, a variety of nano-structures in ionic liquids have been successfully prepared. At present, the ionic liquids in the preparation of inorganic nanomaterials applied research has become a hot research topic. Due to microwave heating with heating rate, the reaction time is short, can provide a more uniform temperature distribution and crystallinity of the product increases the advantages of receive widespread attention. Therefore, in this paper we have taken in the ionic liquid was prepared by microwave heating system, a variety of nanomaterials. 1 Use the ionic liquid precursors by microwave heating, rapid response and synthesis of CdS Nanostructures micro-spherical ZnS nanoparticles, and two kinds of nanocrystals were characterized by XRD tests to detect its composition, calculated the lattice constant, and with Standard cards are compared, the basic agreement; EDS analysis of the use of the composition of two products are in compliance with chemical formula composition; using FESEM were characterized by their morphology, and the reaction time, temperature, reactant concentration on nanocrystalline Morphology was studied through the analysis of experimental results presented its possible reaction mechanism. (2) shall be prepared by microwave rapid heating PbTe hierarchical structure of PbTe under different reaction conditions the growth pattern. Product by XRD detection phase, the morphology was observed by FESEM with EDS detect its composition, based on these results a simple analysis of product formation process. The resulting reaction PbTe show a variety of morphologies, with the reaction conditions, including a funnel-like structure, flower-like structures and dendritic structure. Adding ionic liquids studied processes and products of the reaction structure and properties, and found that after adding ionic liquid system has not the same shape, but more regular crystal, the crystal surface is more rules. On the hierarchical structure of the prepared PbTe nanocrystals made electrochemical performance testing. 3 using microwave heating is first prepared one-dimensional nanowires and Te Te nanorods and use XRD, SEM, HRTEM characterize the phase structure was studied Te Te nanowires and nanorods absorption and fluorescence properties. And Te nanowire respectively, Te nanorods template preparation PbTe PbTe nanorods and nanowires, and analyze the phase structure. On PbTe PbTe nanowires and nanorods were electrochemically tested in the PbTe nanowires and an oxidation peak appears a reduction peak. In PbTe nanorod samples, there has been an oxidation peak, there was no reduction peak, and PbTe nanorods CV curves compared to oxidation peaks appear in the correct location of the electric potential, indicating that this sample is more easily oxidized PbTe, and difficult to be restore.

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