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Studies on Preparation and Photoelectric Characters of nano-TiO2

Author: DingYingYing
Tutor: LiKuiYing
School: Yanshan University
Course: Materials Science
Keywords: Nanocrystalline TiO2 Surface electronic structure Photoacoustic spectroscopy Surface photovoltage spectroscopy
CLC: TB383.1
Type: Master's thesis
Year: 2006
Downloads: 131
Quote: 1
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Abstract


By using the sol - gel prepared nanocrystalline TiO the 2 . Sample preparation process using two different surfactant ( dodecylamine and octadecylamine ) as inhibiting growth agent , its purpose is to reduce the agglomeration of nano- titanium dioxide particles to increase the specific surface area of the material . In this paper, the detection means of titanium dioxide nano sample structure characterization ; using photoacoustic and surface photovoltaic technology on the nature of the electronic states of the surface of the sample , as well as light-induced surface charge transfer transition characteristics . Samples of X-ray (XRD) results show that the samples anatase content is reduced as the calcination temperature increases ; Similarly, the improvement of the hydrolysis temperature will increase the content of the sample of anatase ; However, extending the calcination time is accelerated process of transformation from anatase to rutile titanium dioxide . Sample the results of a transmission electron microscope (TEM) and high resolution transmission electron microscopy (HRTEM) show that the obtained sample using the above system of two surfactants , octadecylamine as the surfactant significantly reduces the agglomeration between the sample particles and increase the material has a specific surface area . Differential thermal analysis (TG-DSC) curve and Fuli Ai transform infrared absorption (FT-IR) spectroscopy results showed that the finally obtained sample components of the surface active agent has been substantially removed . Experimental determination of nanocrystalline TiO 2 the sample of photoacoustic spectroscopy (PAS), surface photovoltage spectroscopy (SPS) and field-induced surface photovoltage spectroscopy ( EFISPS ) . After the analysis of the test results that the surface photovoltaic response wavelength at 380 nm and anatase TiO 2 surface electronic structure , belonging to the main band gap charge transfer transition ; combined sample photoacoustic spectroscopy and surface photovoltage spectroscopy results showed that with the reduction of the average particle size of the sample , no the radiative transition photoacoustic signal enhancement , while appropriate to reduce the content of anatase in the sample , can significantly reduce the sample surface composition nonradiative transition quantum efficiency .

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CLC: > Industrial Technology > General industrial technology > Materials science and engineering > Special structural materials
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