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The Preparation and Properties of Modified TiO2 Thin Films

Author: WangYuYan
Tutor: WangYang
School: Zhejiang University of Technology
Course: Materials Physics and Chemistry
Keywords: TiO2 thin films doped PTA sol hydrophilicity photo catalyst
CLC: TB383.2
Type: Master's thesis
Year: 2011
Downloads: 75
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Abstract


Titanium dioxide （TiO2） is one of the most promising photocatalysts due to its chemical inertness,non-toxic nature,low cost,and has been studied for decades.Potential application,such as anti-fouling,declorizing,sterilizing,antifogging,self-cleaning,etc.are in prospect. However there were two problem that existed in this promising materia,one is the short lifetime of charge carries resulting from higher rate of electron and hole pairs recombination another is that these photo-induced hydrophilic conversion of TiO2 films was actived only irradiating with UV light which is only 4% that contained in solar light.How to improve photo-catalytic activity of TiO2 thin films and increase the light utilization to visible light are the key to technology application of TiO2 photocatalyst.Therefore,developing high photo-active TiO2 photocatalyst is of great importance.In order to prepare good TiO2 thin films,many methods have beenused,including magnetic sputter method,chemical vaper deposition, sol-gel method,etc.Among them sol-gel method is one of the major methods for preparing TiO2 thin films.However traditional sol-gel method has brought environmental problems because they use abundant organic solution or inorganic strong acid solution to avoid the hydrolyzation of Ti4+ iron.TiO2 precursor solution by NH3·H2O modified peroxo-titania acid（PTA） method.This new method takes non-iron water as solvent and H2O2 as complex agent though which it will cause no pollution and low cost.The TiO2 thin films and Fe、N modified TiO2 thin films were prepared on glass substrates by peroxo titanic acid （PTA） sol..The influences of different technological process on hydrophilicity and photocatalyst of the TiO2 thin films were studied by using UV-vis abosorption spectrum,X-ray diffraction,Atomic force microscope,contact angle measurement and decoloration of MB the aim was to find the optimum technology of preparing hydrophilic and photocatalytic TiO2 thin films.The study of TiO2 films indicated that the TiO2 thin films with 4 layers that annealed at 500℃for 2h show the best hydrophilicity,the water contact angle of the TiO2 thin films was 4°under UV light irradiation for 1h, TiO2 thin films with 4 layers that annealed at 400℃for 2h show the best photocatalysis,it could decolorate 20.5% MB under UV light irradiation for 2h. The study of preparation of Fe doped TiO2 film on glass substrate indicated that the addition of Fe in TiO2 film restrain the growth of TiO2 grain,the absorption edge of the Fe-doped TiO2 thin films have red shift,under UV irradiation,the hydrophilicity of lower Fe concentrations doped TiO2 thin films was better than the undoped TiO2 thin films. the hydrophilicity of higher Fe concentrations doped TiO2 thin films was worse than the undoped TiO2 thin films.The N doped TiO2 thin films reveal that the addition of N in TiO2 thin films make the absorption edge red shift.when N:Ti in sol was 2:1,the spectra of TiO2 thin films shift to visible light range.Under visible light irradiation for 3h the N doped TiO2 thin that N:Ti in sol was 2:1 and 3:1 show the best hydrophilicity.The N doped TiO2 thin that N:Ti in sol was 3:1 show the best photo-catalyst.The study of Fe、N co-doped TiO2 film indicated that the co-doped TiO2 film can irradiate by visible light, The decrease in water contact angle of co-doped TiO2 thin films was faster than N doped TiO2 thin films,the decolorated rate of MB by co-doped TiO2 thin films was better than N doped TiO2 thin films.The TiO2 thin film that the experiment prepared has good hydrophilicity and photocatalytic under ultraviolet and visble light,It provide a solid foundation for pratical application of TiO2 thin films.

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