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Effect of Complexants on the Microstructure and Properties of ZnO Thin Films

Author: LinWei
Tutor: ZhaoLianHua
School: Yanbian University
Course: Inorganic Chemistry
Keywords: ZnO thin films Complexing agent Photocatalytic Conductive
CLC: O614.241
Type: Master's thesis
Year: 2010
Downloads: 25
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Abstract


Zinc oxide (ZnO) is a wide gap of the hexagonal structure with a direct band gap of Ⅱ - Ⅵ semiconductor material (3.37eV). ZnO 60 meV exciton binding energy (room temperature thermal ionization 26 meV) and strong ultraviolet stimulated emission, there is great potential for the development of short wavelength light emitting devices become after following GaN wide bandgap semiconductor in another area of ​​research focus. Has a transmittance of up to 90% in the visible region, as well as good electrical conductivity, surface acoustic wave, solar cells, gas sensing and pressure-sensitive components, LCD and other fields has been more widely used, has a broad application prospects. In addition, zinc oxide degradation in aqueous solution such as dyes and oxidation of protocatechuic Reactive Blue 19 showed better than TiO2 photocatalytic properties. Most of the researchers modified by means of ion doped semiconductor composite powder of ZnO. However, the presence of oxidants shortcomings easy deactivation, easy reunion and difficult recovery, thus limiting its practical application. The nanocrystalline ZnO immobilized research to become an important aspect of the development of photocatalytic. So far, most people tend to study the thickness of the film, the calcination temperature, the sol concentration and sol PH value structure and properties of ZnO films. However, the influence of complexing agents on the structure of the film and its photocatalytic properties, electrical properties reported rarely. In this study, using the sol - gel method, respectively ethanolamine (MEA), diethanolamine (DEA), triethanolamine (TEA) as a complexing agent in the two types of glass substrate of ZnO thin films using X-ray diffractometer (XRD) , atomic force microscopy (AFM), UV-vis spectrometer, X-ray photoelectron spectroscopy (XPS) and other technical studies of complexing agent on the structure of ZnO thin films and its performance. The experimental results show that: 1) a complexing agent selected, the the grain diffusion distance, so that the preferential orientation film prepared from the crystal surface structure were different, wherein, MEA / ZnO films exhibit a good (002) crystal plane preferred orientation, DEA / ZnO films followed, TEA / ZnO, the film is anisotropic. 2) MEA / ZnO film was dense ball type, showing a smaller roughness, with its (002) plane orientation of higher correlation. 3) The average particle size of the ZnO thin films prepared three kinds of complexing agents or less, but the photocatalytic activity was quite different. The activity following order: DEA / ZnO gt; TEA / ZnO gt; MEA / ZnO. DEA / ZnO film best light absorption properties, more defects, and the higher of the active species (adsorbed oxygen, and a hydroxyl group) amount is likely to become the best of its photocatalytic performance reasons. 4) the three complexing agent prepared conductive properties of ZnO thin films order: MEA / ZnO gt; DEA / ZnO gt; TEA / ZnO. MEA / ZnO smaller grain boundary energy and electron - hole recombination rate less, is the main reason for its conductive properties. The experimental results for the ZnO films the basis of theoretical studies of the structure and its performance provides a theoretical basis, ZnO films in the field of research to the application of great significance.

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CLC: > Mathematical sciences and chemical > Chemistry > Inorganic Chemistry > Metal elements and their compounds > Section II group metal element and its compounds > The zinc Vice family (Ⅱ B group metal elements ) > Zinc Zn
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