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Nanoscale data-storage media development

By Alma Green,2014-02-18 14:42
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Nanoscale data-storage media development

    Nanoscale data-storage media

    development WATCH

    Nanoscience

    N

    Nanoscaledata-storagemedia

    development

    ewadvancementshave

    beenscoredbyCASscien

    tistsonultrahighdensity

    informationstorageastheysuccess

    fullycarriedoutthereversible,eras. ableandrewritablenanorecordingon H2thinfilmsofrotaxane,asuper- molecularstructureofdumbbel1.1ike moleculestrappedwithinthecavity ofmacrocycles.Accordingtoarecent issueofJournaloftheAmerican ChemicalSociety(JACS),thefeatby fargivesthemostdirectevidencefor thenanorecordingbehaviorscaused byconductancetransitioninrotaxane molecules,whichindicatesaprom- isingfutureformolecularmemories afternecessarvchemical

    mOdificatiOns.

    Withgreatpotentialtobeused

    asabuildingblockformolecular electronicsandnanoscaledata.stor- agemedia,rotaxanemoleculescan undergoreversiblestructuraltransi- tionfollowedbyconductanceswitch. inginsolution.However,theconduc

    tanceswitchingstayedambiguousin solid.statefoITO.By2005,CASsci- entistsfromtheInstituteofPhysics (1oP)andtheInstituteofChemistry (IoC)hadjointlyreportedthewrit- ingofhigh-conductancenanoscale marksonrotaxaneH1thinfilms. However,theerasingpartshowed somediculties.

    Baseduponthiswork,thecol

    laboratorsfurtherimprovedthestruc- tureofrotaxanemolecules.Theirlate JACSreportdemon

    stratedhighstability

    ofsomenanodots

    writtenwith3nm

    featuresizeshowsig-

    nificantstabilityinair

    atroomtemperature.

    Accordingtothere

    viewerofthepaper,

    it"providesconvinc

    ingevidencethatthe

datareservingdots

    areab1etobe

    rewritten,erasedand

    Reversibleconductancetransitionsinducedsequentiallyin

    anindividualrotaxanemoleculebytheSTMfield.

    recoveredonanimprovedH2rotaxane thinfilm.Themostamazingpartisa minorchangeinthecorestructureof rotaxanemoleculesthatcanbring enormouslyimpactsuponitsfunc- tionalbehaviors."Theresearchalso foundanintroductioninthehighlight columnofNatureNanotechnologyun

    derthetitleof''hianorecording:rewrit- inghistory.''

    Theresearchteamalsoobserved thestructuralandcOnductancetran. sitionsofasinglerotaxanemolecule atasubmolecularscale.Withthehelp oflow??temperaturescanningtunnel?- ingmicroscopy(SPM),theydiscov

    eredthattheconductanceswitching oftherotaxanemoleculeresultsfrom itsinherentproperty,inotherwords, anintramolecularstructuraltransition ofthemoleculeitselfThefullpaper waspublishedinthefifthissueof AdvancedFunctionalMaterials (AFM)

    Thedevelopmentoffunctional

    materialsfeaturingstability, rewritabilityandreversibilityhasal

    readybecomeahottopicinultrahigh

    densitydatastorageresearch.At CAS,interdisciplinarynanoscientists havejoinedhandsinthisregardl0 yearsago.TheloPresearchteamled byProf.GAOHongjunwasmainly

    responsibleforthepreparationofex- perimentalequipmentsuchasthin filmsandSPM,aswellastherelated theoreticalcomputationandanalysis, whiletheIoCworkgroupheadby

    ResearchersSONGYanlinand

    ZHANGDeqingcarriedoutthede

    signandsynthesisofthemolecules. Targetingatarefinedcontroloverthe structureandphysicalpropertiesof functionmaterialmolecules,they havereapedaseriesofprogresses, amongwhichsevenoftheiracademic paperswerepublishedbytheJACS, AFMandNature.respectively.?

    BulletinoftheChineseAcademyofSciencesJ145

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