nature杂志二维硼纳米片的实验法实现ppt课件.pptx

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1、二维硼纳米片的实验法实现二维硼纳米片的制备Feng等人采用外延生长的策略实现了在Ag（111）基底表面生长不同周期排列结构的两种二维硼纳米片。该材料具有良好的化学惰性，不易被氧化，有望在微电子器件中得到应用。Contents010203040506AbstractGrowthof2DboronStructuresof2Dboron.XPSstudyon2Dboron.FormationmechanismConclusionsAbstractAvarietyoftwo-dimensionalmaterialshavebeenre

2、portedinrecentyears,yetsingle-elementsystemssuchasgrapheneandblackphosphorushaveremainedrare.Boronanalogueshavebeenpredicted,asboronatomspossessashortcovalentradiusandtheflexibilitytoadoptsp2hybridization,featuresthatfavourtheformationoftwo-dimensionalallotropes,and

3、oneexampleofsuchaborophenematerialhasbeenreportedrecently.Here,wepresentaparallelexperimentalworkshowingthattwo-dimensionalboronsheetscanbegrownepitaxiallyonaAg(111)substrate.Twotypesofboronsheet,aβ12sheetandaχ3sheet,bothexhibitingatriangularlatticebutwithdifferenta

4、rrangementsofperiodicholes,areobservedbyscanningtunnellingmicroscopy.Densityfunctionaltheorysimulationsagreewellwithexperiments,andindicatethatbothsheetsareplanarwithoutobviousverticalundulations.Theboronsheetsarequiteinerttooxidizationandinteractonlyweaklywiththeir

5、substrate.Weenvisagethatsuchboronsheetsmayfindapplicationsinelectronicdevicesinthefuture.Densityfunctionaltheory：密度泛函理论：电子结构理论的经典方法，特别是Hartree-Fock方法和后Hartree-Fock方法，是基于复杂的多电子波函数的。密度泛函理论的主要目标就是用电子密度取代波函数做为研究的基本量。因为多电子波函数有3N个变量（N为电子数，每个电子包含三个空间变量），而电子密度仅是三个变量的函数，无论在概

6、念上还是实际上都更方便处理。B12icosahedralcagesVSgraphitebulkformboronclustersVScarbonclustersvariouscagestructuresB12—，B13+，B19—，B36planarorquasi-planar我是图一.Boronhasthesameshortcovalentradiusandtheflexibilitytoadoptsp2hybridizationascarbon,whichwouldfavourtheformationofvariouslo

7、w-dimensionalallotropes.boronnanotubes,fullerenesand2Dboronsheets13–15particularlyinteresting1.The2Dboronstructurehasbeenpredictedtobemetallic16–20,despitebulkboronbeingasemiconductor.2.Some2DboronstructureshaverecentlybeenpredictedtohostDiracfermions22Diracfermions

8、无质量的狄拉克费米子就是满足狄拉克方程的费米子。特性有:速度接近光速，质量为0，表现为良好的导电特性，电子运动受拓扑学保护。应用上石墨烯、拓扑绝缘体表面态的电子都具有这种性质。TheoreticalpredictionVSexperimentalrealization2Dbo