Qhov sib txawv tseem ceeb ntawm SEM thiab TEM yog SEM tsim cov duab los ntawm kev kuaj pom cov khoom siv hluav taws xob, thaum TEM tsim cov duab los ntawm kev kuaj cov hluav taws xob xa mus.
SEM thiab TEM yog cov cuab yeej tshuaj ntsuam xyuas uas peb siv hauv electron microscopy kom tau txais cov duab ntawm cov khoom me me uas siv cov nqaj ntawm electrons.
SEM yog dab tsi?
SEM stands rau scanning electron microscope. Nws tsim cov duab ntawm cov qauv los ntawm kev tshuaj xyuas qhov chaw ntawm cov qauv. Nws siv lub beam ntawm electrons uas tsom mus rau tus qauv. Cov electrons no cuam tshuam nrog cov atoms ntawm qhov chaw ntawm cov qauv, ua cov cim sib txawv los qhia qhov topography ntawm qhov chaw. Ib lub tshuab kuaj pom cov cim no los tsim cov duab. Lub ntes peb siv ntawm no yog Everhart-Thornley ntes.
Daim duab 01: Sample Chamber of SEM
Daim duab muab los ntawm cov txheej txheem no yog peb qhov loj me, thiab nws tuaj yeem mus txog qhov siab tshaj plaws ntawm 2 lab qhov loj. Ntxiv mus, qhov kev daws teeb meem yog li 0.4 nanometers.
TEM yog dab tsi?
TEM sawv cev rau kev xa khoom hluav taws xob tshuab hluav taws xob. Lub tshuab ntsuas no xa cov nqaj ntawm electrons los ntawm cov qauv. Yog li, qhov no tsim cov duab ntawm cov qauv sab hauv ntawm cov qauv. Tsis tas li ntawd, daim duab no yog tsim los ntawm kev sib cuam tshuam ntawm electrons thiab atoms ntawm cov qauv. Ntxiv mus, peb tuaj yeem tau txais cov duab ntawm lub vijtsam fluorescent lossis cov duab thaij duab.
Daim duab 2: Ib daim duab tau los ntawm TEM
Thaum xav txog qhov kev daws teeb meem, qhov ntsuas no tuaj yeem muab txog 0.5-angstrom daws teeb meem. Tsis tas li ntawd, nws tuaj yeem nthuav tawm ib qho piv txwv txog li 50 lab lub sij hawm tshaj qhov qub. Txawm li cas los xij, daim duab muab los ntawm TEM yog ob sab.
Qhov txawv ntawm SEM thiab TEM yog dab tsi?
SEM stands rau scanning electron microscope thaum TEM stands rau kis electron microscope. Qhov sib txawv tseem ceeb ntawm SEM thiab TEM yog tias SEM tsim cov duab los ntawm kev kuaj pom cov khoom siv hluav taws xob, thaum TEM tsim cov duab los ntawm kev ntes cov hluav taws xob xa mus. SEM txheeb xyuas qhov chaw ntawm tus qauv thaum TEM tsom xam cov qauv sab hauv. Lwm qhov sib txawv ntawm SEM thiab TEM yog lawv qhov kev daws teeb meem Qhov kev daws teeb meem ntawm SEM cov txheej txheem yog li 0.4 nanometers whereas TEM muab txog 0.5 angstroms.
Summary – SEM vs TEM
SEM stands rau scanning electron microscope thaum TEM stands rau kis electron microscope. Qhov sib txawv tseem ceeb ntawm SEM thiab TEM yog tias SEM tsim cov duab los ntawm kev kuaj pom cov khoom siv hluav taws xob, thaum TEM tsim cov duab los ntawm kev kuaj cov hluav taws xob xa mus.
