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Synthesis and Morphology Control of TiO2 Nanocrystals by Hydrothermal Method

Author: ZhangLiMing
Tutor: WeiZhiRen
School: Hebei University
Course: Optics
Keywords: Hydrothermal method Titania Nanofibers Rutile Anatase
CLC: TB383.1
Type: Master's thesis
Year: 2009
Downloads: 147
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Abstract


In this thesis, the hydrothermal method, the reaction in the temperature of 180 ° C for 24 h, the degree of filling of 68%. Hydrothermal Synthesis of sodium titanate nanotubes as precursor synthesized under acidic conditions, the smaller particle size of rutile and anatase TiO2, neutral and alkaline solution under the conditions of synthesis of long leaf-shaped anatase mineral phase nano-TiO2 crystal, the maximum length of 2.5 m, a width of up to 250 nm, a small amount of long leaf-shaped anatase nano TiO2 crystals under strong alkaline conditions, but there are more unreacted sodium titanate nanotubes. Soaked in hydrochloric acid solution of sodium titanate tube precursors were synthesized in neutral and weakly alkaline conditions the rod of about 50 of the 100 nm and 60-110nm long sheet anatase phase TiO2 in synthesized under alkaline conditions of about 300 of the 500 nm leaf-shaped anatase phase TiO2. Experimental results show that the titanium and sodium titanate nanotubes under hydrothermal conditions the dissolution velocity and the solution pH value, pH value the smaller the dissolution faster, smaller crystal particle, whereas the dissolution slow down, · crystal scales larger. Hydrothermal synthesis of sodium titanate fiber precursor synthesis under strong acidic conditions granular rutile and anatase TiO2 mixed crystals synthesized in the acidic conditions of the trend of self-organized anatase mineral phase nano-TiO2 crystal fiber; strong alkaline conditions, the crystalline phase of the synthesized product was essentially unchanged at sodium titanate fiber structure. Soaked in hydrochloric acid solution of sodium titanate fiber precursor synthesized anatase phase nano-TiO2 crystal fiber with self-organizing trends. Experimental results show that: the hydrothermal stability and the pH value of the solution of the titanium and sodium titanate fiber, when the pH value of the solution is small (strongly acidic) faster dissolution of the fiber, only the formation of nanoparticles. Moderate pH values ??under the conditions of anatase TiO2 crystallization rate faster ships dissolution speed of the fiber, so that it can be attached to the surface of the fiber crystallinity, the formation of the directional growth of nano-polycrystalline maintain a fibrous state, it is possible to obtain a quasi-single crystal nanofibers. In strong acid solution under the conditions of TiCl4 as precursor synthesized about 50-200nm columnar rutile phase TiO2 nanocrystals. Under the same reaction conditions, in the preparation of an aqueous solution of TiCl4 were added FeCl3 · 6H2O and NiCl2 · 6H2O were synthesized by about 1-3μm ribbon rutile phase TiO2 nanofibers. Analysis Fe3 and Ni2 solution in the {101} plane of the interface, inhibiting the growth rate of the {110} crystal faces, resulting in the growth of TiO2 nanocrystals in the [001] direction of the one-dimensional.

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