《华中科技大学文华学院毕业设计(论文)文献综述及外文文献翻译》1.doc

《华中科技大学文华学院毕业设计(论文)文献综述及外文文献翻译》1.doc

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华中科技大学文华学院

毕业设计（论文）外文文献翻译

（本科学生用）

题目:

对用高温高压连续流微反应合成磷化铟晶体的研究

学生姓名：

饶龙学号：

080110021117

学部（系）:

信息科学与技术学部

专业年级:

电子科学与技术2班

指导教师：

慎晓丽职称或学位：

讲师

2012年2月27日

外文文献翻译（译成中文1000字左右）：

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InvestigationofIndiumPhosphideNanocrystalSynthesisUsingaHigh-

TemperatureandHigh-PressureContinuousFlowMicroreactor

JinyoungBaek,PeterM.Allen,MoungiG.Bawendi,*andKlavsF.Jensen

Indiumphosphide（InP）nanocrystals[1]areofsignificantinterestforuseinoptoelectronicdevices,specificallyasareplacementforCdSenanocrystalsincommercialapplications.However,thecurrentmechanisticunderstandingandsyntheticproceduresforInPnanocrystalshasnotyetreachedthesamelevelasforCdSenanocrystalsynthesis.[2]Usingatrulycontinuousthree-stagemicrofluidicreactortopreciselytunereactionconditionsinthemixing,aging,andsequentialgrowthregimes,ourstudydescribedherebuildsonpreviousInPnanocrystalsynthetic[3]andmechanisticwork[4]toprobethesignificantexperimentalparametersinvolvedinInPnanocrystalsyntheses.WefindthatthegrowthofInPnanocrystalsisdominatedbytheagingregime,whichis

consistentwithamodelofInPnanocrystalgrowthwherenanocrystalgrowthisdominatedbynonmolecularprocessessuchascoalescencefromnonmolecularInPspeciesandinterparticleripeningprocesses.[4]TheInPgrowthmodelisincontrasttothemolecular-basedgrowthofnanocrystalsasobservedinCdSeandPbSenanocrystals.[2a–f]WeobservethatthesizeofInPnanocrystalsispredominantlydependentontheconcentrationoffreefattyacidinsolutionandtheagingtemperature.OtherexperimentalparameterssuchasinjectiontemperatureandparticleconcentrationdonotappeartosignificantlyaffectInPnanocrystalsizeorsizedistributions.Inaddition,weprobetheabilitytogrowlargerInPnano-crystalsthroughthesequentialinjectionofprecursorsinthethirdstageofthemicrofluidicreactor.Theuseofhightemperaturesandhighpressuresinacontinuousmicrofluidicsystemallowsforawideselectionofsolvents,precursors,andligandsystems,providingavastlyincreasedparameterspacetoexploresyntheticconditions.Theutilizationoflow-molecular-weightsolventsathighpressuresofferssupercriticalconditionstunablefromliquidtogaslikeprovidinghighdiffusionrates,improvedmixing,[6]andtheabilitytosolubilizevariouscompoundsinaccessiblebysolventsemployedintraditionalnanocrystalsyntheses.[2b,c,3,7]Theuseofasupercriticalsolventinamicrofluidicreactorresultsinnarrowerresidencetimedistributions,producinghomogeneousreactionconditionsidealfornano-crystalsynthesis.[8]Microfluidicsystemsallowprecisecontroloverreactionconditionsandreproducibility[9]asaresultofrigorouscontrolofheatandmasstransfer.[10]Inaddition,themicrofluidicsystemcanbeutilizedforfastscreeningofreactionparameterswithinsitureactionmonitoring.[11]Figure1illustratesourtrulycontinuousthree-stagesili-con-basedmicrofluidicsystemconsistingofmixing,aging,andsequentialinjectionstagesoperatingatapressureof65bar,

withoutincorporatinganymanualbatchmanipulationbetweensynthesissteps.[2h]Wehaveseparatedeachstageinordertoindependentlyprobemixingandagingprocesses.ThefirsttwostagesofthereactorwereutilizedforthesystematicstudyofInPnanocrystalformation（Figure1a,b）.Themixingreactorwasmaintainedatauniformtemperaturetoinvestigatetheeffectofdifferentmixingtemperatures.Alternatively,thefirstreactionstagecanbeheatedtocreateatemperaturegradientinordertorapidlyobtainhighlycrystallineInPnanocrystalswithrelativelynarrowsizedistributions（seeFigureS1intheSupportingInformation,）.Thesecond（aging）stageofthereactorwasoperatedattemperaturesrangingfrom200–3408Ctostudytheeffectofagingtemperature.Inthethirdstageofthesystem,asequentialinjectionreactor（Figure1c）wasusedtosupplymoremolecularprecursorsforthefurthergrowthofInPnanocrystals.InthecaseofmostInPnanocrystalsyntheses,boththeagingandsequentialgrowthreactorsweremaintainedat3208Ctoutilizesupercriticaloctane（Tc=296.178CandPc=2.50mPa）.Octanewasselectedasthesolventinordertoprovideexcellentmixing,fastdiffusivity,andsufficientdensityforthesolubilizationofallreagents.

对用高温高压连续流微反应合成磷化铟纳米晶体的研究

JinyoungBaek,彼得·m·艾伦,Moungig.Bawendi、*和Klavsf·詹森

磷化铟（InP）纳米晶[1]用于光电设备具有的重大价值,特别是在商业应用中作为一个硫化锌奈的替代品。

然而，就硫化锌纳米晶体的合成来说，当前对InP纳米结晶机械的理解和合成程序尚未达到相同的水平。

使用一个真正的连续三阶段的微流控反应堆来精确协调混合、老化和连续增长状态的反应条件,我们这里描述的研究建立在之前的铟的纳米晶体合成和机械的工作之上来探测重要的实验参数包含InP纳米晶体的合成。

我们发现的增长主要来自InP纳米晶体老化的状态,这是用一种模型一致InP纳米晶体增长,主要是无分子状态组成的纳米晶体生长过程,如聚结从无