原子力显微镜AFM原理及操作手册.pdf
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原子力显微镜AFM原理及操作手册.pdf
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Page1AsylumResearch2014AtomicForceMicroscopyPart2:
StandardmodesandapplicationsAsylumResearchPage2AsylumResearch2014CommonmodesofoperationAfewapplicationsAfewNEWapplications!
andsomecoolimagesPrinciplesofAFMPage3AsylumResearch2014ForcemeasurementsContactmodeAC(tapping)modeandsourcesoferrorinmeasurementsModesofOperationPage4AsylumResearch2014SampleLightSourceFocusingOpticsCantileverPositionSensitiveDetectoryxzShakePiezoVarythetip-sampleseparation,usuallywithoutfeedback-50Deflection(nm)-1.6-1.2-0.8-0.4ZPosition(m)F=-kxModesofOperationforcecurvesPage5AsylumResearch2014DeflVoltsVorDeflectionnmorForceNForce=(DeflVolts)*(DeflInvOLS)*(k)nNVnm/VnN/nmDeflectionTipsampledistancenmModesofOperationforcecurvesPage6AsylumResearch2014k=21.40.4pN/nm15x10-12105PowerSpectrum(nm/Hz)14kHz121086420Frequency(kHz)12kA212kBTEquipartitiontheoremquantifiesthermal(Brownian)motionAdvantages-“standard”-non-destructive-easytouseDisadvantages:
-mustfirstcalibratesensitivity-valuesgoodtoonly10%SpringconstantcalibrationModesofOperationforcecurvesPage7AsylumResearch2014ModesofOperationforcecurvesPage8AsylumResearch2014ArraysofForcecurvescanbeusedtocalculatethelocalstiffnessofasampleModesofOperationforcecurvesPage9AsylumResearch20146420-2nm-4.8-4.6-4.4-4.2-4.0-3.8mARTIFACTSopticalinterferencePage10AsylumResearch201420151050-5nm-50050nmARTIFACTStip/substrateinteractionPage11AsylumResearch2014302520151050nm1.41.21.00.80.60.40.20.0m0.5Hz5Hz10HzVelocity:
Increasingvelocityaddshysteresisbetweenapproach&retractportionsofcurveARTIFACTShydrodynamiceffectsPage12AsylumResearch2014BsurfacechargepullscantilevertosurfaceARTIFACTSsurfacechargingPage13AsylumResearch2014LaserMirrorCantileverQuadPDSurfaceVtLaserMirrorCantileverQuadPDSurfaceVtLaserMirrorCantileverQuadPDSurfaceVtLaserMirrorCantileverSurfaceQuadPDtVSurfaceLaserMirrorCantileverQuadPDSurfaceLaserMirrorCantileverQuadPDSurfaceLaserMirrorCantileverQuadPDModesofOperationcontactmodePage14AsylumResearch2014TipsampledistancenmDeflVoltsVPointoffirstcontactSetpointModesofOperationcontactmodeDeflectionfeedbackPage15AsylumResearch2014ChangesinheightwhilescanningaredisplayedonthecomputerastopographyModesofOperationcontactmodePage16AsylumResearch2014LaserMirrorCantileverQuadPDVSurfacetLaserMirrorQuadPDVCantileverSurfacetLaserMirrorCantileverQuadPDVSurfacetLaserMirrorQuadPDVCantileverSurfacetLaserMirrorCantileverQuadPDVSurfacetLaserMirrorCantileverQuadPDVSurfacetLaserMirrorCantileverQuadPDVSurfacetLaserMirrorCantileverQuadPDVSurfacetLaserMirrorCantileverQuadPDVSurfacetSurfaceLaserMirrorCantileverVtQuadPDSurfaceLaserMirrorCantileverQuadPDVtSurfaceLaserMirrorCantileverVQuadPDtSurfaceLaserMirrorCantileverQuadPDVtSurfaceLaserMirrorCantileverVtQuadPDModesofOperationAC(tapping)modePage17AsylumResearch2014Tip-sampledistanceAmplitudeSetpointFreeamplitudePointoffirstcontactModesofOperationAC(tapping)modeAmplitudefeedbackPage18AsylumResearch2014SampleLightSourceFocusingOpticsCantileverPositionSensitiveDetectoryxzShakePiezoZfeedback6050403020100m6050403020100mChangesinheightwhilescanningaredisplayedonthecomputerastopographyModesofOperationAC(tapping)modePage19AsylumResearch2014ARTIFACTS:
TipSize&ShapeEffectsImageisnotequivalenttoaphotograph.Weseeaconvolutionofsamplesurfacewithshapeoftip.Tipmustfitinbetweensurfacefeatures.Aslongastipissmallerthanfeatures,accurateXYrepresentationofsurface.VeecoPage20AsylumResearch2014ProbeSimulatorbyJosephGriffithSampleAFMTipMeasuredtopographyGoodTipBadTipReallyBadTipARTIFACTS:
TipSize&ShapeEffectsPage21AsylumResearch2014-1.0m-0.50.00.51.0ZSensor121086420m2umcubeparticles:
ImagessideoftipSurfaceimagestipARTIFACTS:
SurfaceimagesthetipPage22AsylumResearch20142.01.51.00.50.0m543210m-40-2002040nm2.01.51.00.50.0m543210m-40-2002040nmARTIFACTS:
FunkytipPage23AsylumResearch201486%setpoint55%setpoint5umx5um10umpitchVLSIcalibrationgrid;ACmodeimageinairparachutinggoodtrackingARTIFACTS:
ToomuchforceappliedPage24AsylumResearch2014Integralgain=40Integralgain=2Integralgain=95umx5umscan,10umpitchVLSIcalibrationgrid;ACmodeimageinairARTIFACTS:
Feedbackloopeffects(highgain)Page25AsylumResearch201448mV66mV500mV302520151050302520151050m5umx5um100umpitchVLSIcalibrationgrid;ACmodeimageinairARTIFACTS:
Feedbackloopeffects(driveamplitude)Page26AsylumResearch2014302520151050m302520151050m-20-1001020nm-200nm-150-100-500Height2520151050m302520151050m302520151050m-20-1001020nm-200nm-150-100-500Height302520151050mARTIFACTS:
ScanrateeffectsPage27AsylumResearch2014ImagesApplicationsmeasurementsPage28AsylumResearch2014250nmscanDNAinliquidImagesPage29AsylumResearch2014Consecutiveupanddownscans
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- 原子 显微镜 AFM 原理 操作手册