micro-raman and cathodoluminescence microscopy and ......applications of cathodoluminescence •...
TRANSCRIPT
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Micro-RamanandCathodoluminescence
MicroscopyandSpectroscopy
Zhiheng LiuandMattDeLongDepartment ofPhysicsandAstronomy,UniversityofUtah
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Micro-RamanandPhotoluminescenceSpectroscopyandMicroscopy
• WiTecAlphaSNOMsystem• Sub-micronspatialresolution• 2D-scancapabilityforspectral
imaging• Multiplelaserlinesfor
excitation
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Micro-RamanofGraphene
Sisubstrate
Laser line
Gband
2Dband
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Spectralimageofnanowire
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Cathodoluminescence inSEM
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ApplicationsofCathodoluminescence
• Lightemittingdiodes– Givesemissionspectraasafunctionofpositiononthemicronscale
• Geology– Analysisofzircons,quartzandother luminescentmaterialsonthe
deepsubmicronscale– Infergeologicalhistory
• LuminescenceimagingwithnanoscalespatialresolutionprovidedbySEM.
• Illuminatesstructuresnotvisibleinsecondaryelectronimages.
• Givesdetailedinformationoncomposition(viaspectraandemissionintensities)notpossiblebyothertechniques.
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SecondaryElectronImageofZircon
All-LightCLImageofZircon
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ZirconEmissionSpectrumfrom300to1000nm