石墨烯的透射电子显微镜研究课件

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1、Structure Determination of Graphene by TEMXIAO Gaobo11900474R石墨烯的透射电子显微镜研究OutlineBrief introduction about grapheneReview of TEMHow scientists use TEM to study the structure of grapheneSummary石墨烯的透射电子显微镜研究Graphene is a one-atom-thick planar sheet of sp2-bonded carbon atoms that are densely packed in

2、a honeycomb crystal lattice.Molecular structure of grapheneHigh resolution transmission electron microscope images of graphene石墨烯的透射电子显微镜研究Graphene is as the strongest material ever measured,some 200 times stronger than structural steelElectrical conductivity97.7%transmittance of white lightThermal

3、conductivity石墨烯的透射电子显微镜研究OutlineBrief introduction about grapheneReview of TEMHow scientists use TEM to study the structure of grapheneSummary石墨烯的透射电子显微镜研究TEM-Transmission electron microscope石墨烯的透射电子显微镜研究Working modes of TEMu Diffraction modeu Imaging mode 1 Amplitude contrast A)mass/thickness B)dif

4、fraction 2 Phase contrast石墨烯的透射电子显微镜研究Diffraction modeFor a thin sheet of single crystal,its reciprocal lattice is a set of parallel rodsFor polycrystalline specimen,its reciprocal lattice is series of concentric spheresThe diffraction pattern can be seen as a magnified view of a planar section thro

5、ugh the reciprocal lattice normal to the incident beam.石墨烯的透射电子显微镜研究Amplitude contrastPhase contrastImanging moderelatively low resolutions(1nm)very high resolutions(1nm)石墨烯的透射电子显微镜研究OutlineBrief introduction about grapheneReview of TEMHow scientists use TEM to study the structure of grapheneSummary

6、石墨烯的透射电子显微镜研究J.C.Meyer,2007,Nature lettersMicrometre-sized metallic scaffoldGrapheneFolded regionBright-field TEM image of suspended grapheneMonolayer graphene,a fold exhibits only one dark lineBilayer graphene,a fold exhibits two dark lines2nm2nm石墨烯的透射电子显微镜研究For single-layer graphene,intensities in

7、 reciprocal space are continuous rods For two-layer samples,an intensity variation along the rods is presentJ.C.Meyer,2007,Solid State CommunicationsSingle-layer grapheneBilayer graphene(AB stacked)石墨烯的透射电子显微镜研究atomically flatcorrugatedor?石墨烯的透射电子显微镜研究0o14o26oDiffraction pattern of graphene at diffe

8、rent incident anglesJ.C.Meyer,2007,Nature letters石墨烯的透射电子显微镜研究Reciprocal lattice of flat grapheneReciprocal lattice of corrugated grapheneThe increase of diffraction spot size can be explained by a corrugated surface,whose reciprocal lattice is a series of cone shaped volumes.J.C.Meyer,2007,Nature l

9、ettersIncreasing spot size at larger incident angle石墨烯的透射电子显微镜研究By using aberration-correction in combination with a monochromator,1-resolution is achieved at an acceleration voltage of only 80 kV.J.C.Meyer,2008,Nano lettersLattice with defectsConfiguration of defects1nm石墨烯的透射电子显微镜研究alar.Girit,2009,

10、ScienceDynamics of carbon atoms at the edge of a hole石墨烯的透射电子显微镜研究Carbon adatomHydrogen adatoms on the same sampleJ.C.Meyer,2008,NatureHydrogen adatomsCarbon adatomHydrogen adatomIndividual carbon adatom on graphene2nm2nm石墨烯的透射电子显微镜研究SummaryIn the past,TEM has been used to differentiate single-layer

11、 graphene.to study the surface morphology.to study the lattice defects.to investigate individual foreign atoms on graphene.石墨烯的透射电子显微镜研究References 1 A.Fasolino et al.,Intrinsic ripples in graphene,NATURE MATERIALS2007,6(11),858-861.2 AC Ferrari et al.,Raman spectrum of graphene and graphene layers,P

12、hys.Rev.Lett.2006,97(18),.3 CO Girit et al.,Graphene at the Edge:Stability and Dynamics,Science 2009,323(5922),1705-1708.4 A.V.Krasheninnikov et al.,Engineering of nanostructured carbon materials with electron or ion beams,Nature materials 2007,6(10),723.5 Z.Liu et al.,Open and Closed Edges of Graph

13、ene Layers,Phys.Rev.Lett.2009,102(1),.6 J.C.Meyer et al.,On the roughness of single-and bi-layer graphene membranes,Solid State Communications,2007,143(12):101.7 JC Meyer et al.,The structure of suspended graphene sheets,Nature 2007,446(7131),60-63.8 JC Meyer et al.,Imaging and dynamics of light ato

14、ms and molecules on graphene,Nature 2008,454(7202),319-322.9 JC Meyer et al.,Direct Imaging of Lattice Atoms and Topological Defects in Graphene Membranes,NANO LETTERS 2008,8(11),3582-3586.石墨烯的透射电子显微镜研究10 W.Moritz et al.,Structure Determination of the Coincidence Phase of Graphene on Ru(0001),Phys.R

15、ev.Lett.2010,104(13),.11 KS Novoselov et al.,Electric field effect in atomically thin carbon films,Science 2004,306(5696),666-669.12 C.Stampfer et al.,Energy Gaps in Etched Graphene Nanoribbons,Phys.Rev.Lett.2009,102(5),.13 Knut W.Urban and Knut W.Urban,Studying atomic structures by aberration-corrected transmission electron microscopy,Science(New York,N.Y.)2008,321(5888),506.14 Knut W.Urban and Knut W.Urban,Electron microscopy:The challenges of graphene,Nature materials 2011,10(3),165.石墨烯的透射电子显微镜研究Thanks for your attention石墨烯的透射电子显微镜研究