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Preparation and Property Research of CdTe Nanocrystals and TiO2-based Coatings

Author: NieWenHua
Tutor: XiePingBo
School: South China University of Technology
Course: Materials Science
Keywords: Semiconductor CdTe nanocrystals Light Titanium dioxide Self-cleaning
CLC: TB383.1
Type: Master's thesis
Year: 2011
Downloads: 33
Quote: 0
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Abstract


Semiconductor nanomaterials , atomic and structural differences in absorption edge from infrared , near-infrared has been extended to the visible and ultraviolet band , which makes a broad wavelength range , you can find the right semiconductor nanomaterials specific photoluminescence light-induced chemical reactions , light-induced super-hydrophilic self-cleaning research and application . The experimental system of the paper is a synthesis of nanocrystalline CdTe light-emitting materials and preparation TiO 2 < / sub > coating materials, the following two results : (1) consistency through the water into a particle size of about 2.9 nm to 3.8nm the CdTe nanocrystals, simple , innovative and low cost of raw materials . Semiconductor quantum dots synthesized in aqueous solution , the study of particular importance for applications in biological research . Using thioglycolic acid as a stabilizer , synthetic water-soluble CdTe nanoparticles having various fluorescence emission wavelengths , XRD showed that the synthesis of CdTe nano - crystal is a cubic crystalline phase , the lattice in a small amount of sulfur to participate in the ligand . UV absorption and fluorescence emission spectra with the reaction time and redshift , the synthesis of nanocrystals emission FWHM range 35 - 45nm , and monodisperse good . Addition of a strong visible light the CdTe Nanocrystals due to continuous light-induced oxidative corrosion resulting in the decrease of the effective radius and the increase in surface defects , the effective radius decreases caused by the blue shift and the increase of surface defects caused by the weakening of the fluorescence intensity . (2 ) In order to control the structure and surface composition to achieve a controlled performance . To hydrophilic materials titanium dioxide dispersion ( homemade ) , hydrophobic materials PTFE emulsion , a water-soluble polysiloxane ( homemade ) were mixed uniformly in the same dispersion system , the surface can be obtained by selecting a suitable surfactant and control the amount component controllable performance super-hydrophilic , superhydrophobic , the hydrophilic point and hydrophobic point of uniform distribution . Using a pressure spray coating method , spray coating and cured film on a glass plate , and then the film photoluminescence contact angle XRD , IR , thermal properties , SEM characterization . The results showed that this coating film having excellent self-cleaning properties , thermal properties, insulating properties .

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