Hexagonal mesocrystals formed by ultra-thin tungsten oxide nanowires.pdf

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1、ViewOnline/JournalHomepage/TableofContentsforthisissueCOMMUNICATIONwww.rsc.org/chemcomm

2、ChemCommHexagonalmesocrystalsformedbyultra-thintungstenoxidenanowiresandtheirelectrochemicalbehaviourwDongWang,JingLi,XuanCao,GuangshengPang*andShouhuaFengReceived11thJune2010,Accep

3、ted7thSeptember2010DOI:10.1039/c0cc01835jHexagonalmesocrystalsformedbytungstenoxidenanowiresThetitaniumhornisdipped1cminthesolution.Theresulthavebeensynthesizedusingasolvothermalmethodwithoutanysolutionwastransferredtoa45mLTeflon-linedstainlesssteeltemplate.Theselecteda

4、reaelectrondiffraction(SAED)analysisautoclavewhichwasthenheatedinanovenat2001Cfor24h,oftheregularhexagonalmesocrystaldemonstratesthatthetorealizethesynthesis.Thetungstenoxidehexagonalnanowiresarehighlyordered.Electrochemicalbehaviourofhierarchicalmesocrystalisfoundtobeb

5、uiltfromhighlythemesocrystalshasbeenevaluatedbycyclicvoltammograms.orderedultra-thinnanowires.Afteradetailedstudyofthestructureoftungstenoxidehexagonalmesocrystal,wefindtheManufacturingrealisticnanodevicesusingnanoscalebuildingresultinghexagonalshapemadefromorientedatta

6、chmentofblocksrequiresthemanipulationofthesenanomaterialsintoathenanowireswhichhaveinherentanisotropy.1–7Fig.1showsthefieldemissionscanningelectronmicroscopyhighlyorderedform,butassemblingof1Dnanocrystalsisstillachallengeduetothesmallsizeandtherequirementof(FESEM)imageo

7、ftheas-preparedtungstenoxidemeso-orientationalorder.Mesocrystalswhichhaverecentlybeencrystals.Thelow-magnificationimagesrevealthatthe8mesocrystalshaveauniformsizedistribution(Fig.1a).TheintroducedbyCo¨lfenetal.,maypaveanewwayfordesigningandcontrollingthebottom-upsynthes

8、isofnano-high-magnificationFESEMimagesarepresentedinFig.1b.devices.AmesocrystalisdefinedascolloidalcrystalsthatareThewidthofthemesocrystalsisabout0.4mmandthelengthisbuiltupfromindividualnanocrystalsandarealignedinabout1mm.Themesocrystalsarecomposedofmanyultra-commoncryst

9、allographicregister.Mesocrystalsusuallythinnanowires.Althoughothertungstenoxidenanobundles9havebeensynthesizedpreviou