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Control of the morphology of the nano- TiO 2 and synthetic mechanisms

Author: JiangBaoJiang
Tutor: JingLiQiang；FuHongGang
School: Heilongjiang University
Course: Physical and chemical
Keywords: TiO2 Soft template method Nanorods Oleic acid
CLC: O614.411
Type: Master's thesis
Year: 2007
Downloads: 220
Quote: 0
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Abstract


In this thesis, the \rod reverse micelle reaction template , while controlling the reaction conditions in excess of oleic acid were successfully prepared the structural stability of anatase TiO2 nanorods . At the same time using XRD , FT - IR , TEM and other modern characterization by means of one-dimensional structure formation mechanism and influencing factors of in-depth analysis . In the the TiO2 morphology control process , the use of reverse micelles C17H33COONH ( CH3 ) 3 coryneform \4nm, a length of about 12 to 15 nm anatase TiO2 nanorods by XRD and HRTEM analysis shows : the TiO2 nanorods along the (001) growth direction . Changing the reaction conditions of the synthesis of TiO2 , XRD , FT - IR , TEM characterization of the prepared TiO2 nanorods samples , further analysis of TiO2 nanorods impact of growth factors as well as the formation mechanism synthesis mechanism can be summarized as follows : ( 1 ) oleic acid and trimethylamine synergistic effect at low temperature synthesis of oleic acid amine salt ( C17H33COONH ( CH3 ) 3 ) a rod reverse micelles , in reverse micelles space limit domain and amino selective adsorption specific crystal surface can be synthesized anatase TiO2 nanorods . (2) when the system trimethylamine does not exist , tetrabutyl titanate in oleic acid with water to form spherical reverse micelles hydrolysis of spherical nano- TiO2 . TiO2 nanorods optimum conditions : crystallization temperature of 80 ° C to 90 ° C , and the crystallization time 24 . Increase the ratio of water to titanium , reducing the ratio of oil to titanium are able to promote the growth of TiO2 one-dimensional directional .

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CLC: > Mathematical sciences and chemical > Chemistry > Inorganic Chemistry > Metal elements and their compounds > Section Ⅳ group metal elements and their compounds > The titanium Vice family ( IV B group metal elements) > Ti Ti
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