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Fabrication and Property Study of One-dimensional Semiconductor Nanomaterials

Author: HanYuZuo
Tutor: YaoSuZuo
School: Tianjin University
Course: Applied Chemistry
Keywords: Semiconductor The nanowires ( pipe ) Electrodeposition Sol - gel Composite nanomaterials
CLC: TB383.1
Type: Master's thesis
Year: 2006
Downloads: 242
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Abstract


In this paper, the electrochemical and chemical methods , anodic aluminum oxide (AAO) film as a template to prepare a one-dimensional semiconductor nanowires , nanotubes were characterized by their morphology and structure , and the factors influencing the process of preparation , the formation of mechanism and material properties . Twice anodizing process in oxalic acid electrolyte system highly ordered nanopore arrays alumina template . The atomic force microscope (AFM) on the fine structure of the AAO membrane were tested, and found that the the AAO film surface six square nanopore hole end as a plum-like . Hard template method and soft template prepared nanometer semiconductor CdS . To AAO template, under conditions In addition to the barrier layer , no pre - gilded , DC deposition prepared CdS nanowires of uniform diameter about 75nm, and the template aperture . Raman spectra of CdS nanowires is blue-shifted fluorescence spectra of a significant emission peak at 573 nm . Dodecyl sulfate (SDS) as a soft template using ultraviolet photochemical reduction of CdS nanomaterials synthesis of different morphologies ( spherical , needle- , rod- and worm -like ) . X-ray diffraction (XRD) test CdS nanorods hexagonal structure ( wurtzite structure ) . UV - visible spectroscopy (UV-vis) absorption edge ( The wavelength λe of = 480 nm ) the relative for bulk CdS blue shift . AAO as a template , using the sol - gel method to obtain TiO 2 nanowires and nanotubes by a scanning electron microscope ( SEM ) , transmission electron microscopy ( TEM ) , XRD , UV -vis TiO < sub> 2 nanowire and nanotube morphology , structure and optical properties of the test . The results show that , TiO 2 nanotubes for anatase , UV - visible spectrum absorption edge is about 350 nm, relative to the TiO 2 powder slightly blue shift . AAO template prepared the concentric cable structure TiO 2 / PAN composite nanowires and the \uniform thickness . TiO 2 / PAN composite nanotube diameter of about 100nm, a wall thickness of about 40nm .

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