第四届国际一维纳米会议海报Poster-Zhiwei-Liu

UniversityofScienceandTechnologyBeijingUniversityofScienceandTechnologyBeijingThecreepdamageandindentationsizeeffectofone-dimentionalZnOmaterialsZhiweiLiu,XiaoqinYan,YueZhang*StateKeyLaboratoryforAdvancedMetalsandMaterials,SchoolofMaterialsScienceandEngineering,UniversityofScienceandTechnologyBeijing,100083Beijing,PRChina.KeyLaboratoryofNewEnergyMaterialsandTechnologies,UniversityofScienceandTechnologyBeijing,100083Beijing,PRChina.E-mail:[e-mail]-quality1-DZnOmaterialsweresuccessfullysynthesizedbychemicalvapordepositionmethod.Fig.1SEMimageofsynthesized1-DZnO，theinsetisahighermagnificationimage.1TheCreepDamagephenomenonof1-DZnOwasobservedduringthenanoindentationexperimentsandthemechanicalparametersweredetermined.020406080020406080100Load(N)Displacement(nm)ABCCreepdamageFig.5TheL-Dcurveofthenanoindentationexperiment03060901201500.000.050.100.150.200.250.30Force(mN)Displacement(nm)02040608010012010203040506070Elasticmodulus(GPa)Indentationdepth(nm)02040608010012024681012Hardness(GPa)Indentationdepth(nm)Theelasticmodulusisrangedfrom65.9GPato12.3GPaandthehardnesschangedfrom11.1GPato1.8GPawiththeincreaseofindentationdepth.Theindentationcausedthepermanentplasticdeformationandthelongitudinalconductanceofthe1-DZnOtoincreaseby41%.Fig.7I-Vcurvesbeforeandafterindentation,theinsetistheSEMimageofresidualindentimpression.Fig.6L-Dcurvesobtainedinthecyclesloadmodeexperimentandtherelationshipbetweentheelasticmodulus/hardnessandthedepth(a)The1-DZnOexhibitedasignificantcreepdamagephenomenonandtheindentationsizeeffect.(b)Theindentationcausedthemechanicalandtheelectricaldamageinthe1-DZnO.(c)Theresearchresultsmayprovideareferenceofmechanicalpropertiesandasafetyguidanceof1-DZnOactingasbuildingblockinfutureMEMSdevices.Duetotheuniquepiezoelectricandsemiconductingproperties,1-DZnOhasbecomeasubjectofintenseresearcheffortsandshownawiderangeofpotentialapplications.Especially,it’susedasthebuildingblockinMEMS/NEMS.Thefollowingsignificantproblemsareraised:(a)Todeterminethemechanicalproperties;(b)Toinvestigatetheservicesafety.IntroductionExperimentalmethodFig.2SamplepreparationFig.3NanoindenterDCMsystemResultsanddiscussionFig.4ThemeasurementschematicdiagramAcPmaxHAc1dhdP2πErE1μ211Eμ21Er1E=31.68GPa,H=5.82GPa2Indentationsizeeffect3Indentation-inducedmechanicalandelectricaldamageConclusionsIndentationisperformedon1-DZnOCompressedatsomeregionDistancebetweenatomsisshortenedConductivityisenhancedScatteringeffectisweakenedPiezoresistanceeffectmechanismReferences[1]M.Lucas,W.Mai,R.Yangetal.AspectratiodependenceoftheelasticpropertiesofZnOnanobelts.Nanoletters，2007，7（5）：1314-1317[2]G.Feng,A.S.Budiman,W.D.Nixetal.Indentationsizeeffectsinsinglecrystalcopperasrevealedbysynchrotronx-raymicrodiffraction.JournalofAppliedPhysics，2008，104（4）：043501-042513[3]S.X.Mao,M.Zhao,Z.L.Wang.Nanoscalemechanicalbehaviorofindividualsemiconductingnanobelts.Appliedphysicsletters，2003，83(5)：993-995