多孔tio2纳米陈列的制备和生长机理探究

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1、万方数据浙江大学硕士学位论文关键词：有限元分析，ATO孔阵列，电流密度分布，TiF4(TiF62-)水解，形貌制备万方数据AbStractAbstractHighlyorderedTi02nanostructures，similartoanodicaluminumoxide(从O)nanopores．combinenotonlytheexcellentsemi-conductorpropertyofTi02butthehighsurface．to．volumeratiosfromnanos缸1lcnlre．wh

2、ichleadingtoitsincreasinginvestigationinsuchareasasphotocatalyticapplications，sensing，andphoto—electrolysis．AstheAAOnanoporespreparation，electrochemicalanodizationisnlemostefficientandconvenientmethodtopreparehighlyorderednanoTi02structures．comparedwithtempl

3、atemethodandsol—gelmethod．Theprimaryquestionfocusedonthefailuretoclarifythereasonwhyt11esimilarpreparationmethodsleadtothedifferentmorphologiesintitaniumandaluminumanodization．Contrarytothealuminumanodizationthatproducestypicalorderedporousstructures，Tianodi

4、zationnormallyproducestubularstructuresofanodictitaniumoxide(ATO)．Uptonow,thepreparationofTi02nanoporebyanodizationisstillachallengewithlimitedprogress·Inthisthesis．ATOnanoporeformationmechanismwasstudiedandwiththemodifiedexperimentalparameters，Ti02nanoporew

5、aspreparatedbysecond-stepanodizationforthefirsttime．Recently,wefoundthattheexistenceofTiF62’hydrolyticreactionleadstothedepositionofTi02onthesurface，whichthenchangedthemorphologyofthebarrier1averandinducedtheanodiccurrentredistribution，andasaresult，thewallof

6、nanoporewasseparatedandnanoporesstructuretransformedtonanotube．Withthisasbackground，inthisstudy,wesystematicallystudiedtheinfluenceofinitialmorphologyoftheTi02barrierlayeronitscurrentdensitydistribution，bycontrollingthemorphologyofthisinitialTi02barrierlayer

7、,thecurrentdensitydistributioncanbeadjustedtofavortheformationofeithertubularstructureorporousstructure．Semi—Shaped，Tri—Shaped，6nnlTri-ShapedmodelswerebuilttodeveloptheidealCUlTentdensitydistributionforATOnanopore．Withthehelpofdistributionsoftheelectricfield

8、，electricpotentialandelectriccurrentdensityintheTi02barrierlayerthatsimulatedbyfiniteelementmethod(FEA)usingANSYS11．0，wefinallyestablishedtheidealtheoreticalmodelforTi02nanopore：6rimTri—Shapedmo