Dab tsi yog Atomic Force Microscope (AFM)?
Atomic Force Microscope (AFM) yog ib qho kev sim tshiab rau kev soj ntsuam cov kab mob saum npoo av ntawm cov qauv los ntawm kev siv cov kev sib cuam tshuam ntawm cov atoms thiab cov molecules. Nws yog txawm peem rau nrog ib tug nanoscale sojntsuam tsau ntawm ib tug flexibly tswj microscale elastic cantilever. Thaum qhov kev sojntsuam mus txog tus qauv, kev sib cuam tshuam ntawm cov atoms ntawm qhov kev sojntsuam thiab cov atoms ntawm cov qauv saum npoo khoov lub cantilever thiab tshem tawm ntawm nws qhov chaw qub. Daim duab peb-dimensional yog rov tsim dua raws li qhov deflection lossis vibration zaus ntawm kev sojntsuam thaum lub sijhawm kuaj, kom lub ntsej muag morphology thiab atomic muaj pes tsawg leeg ntawm cov qauv tuaj yeem tau txais tsis ncaj.
Nws kawm txog cov qauv saum npoo thiab cov khoom ntawm cov ntaub ntawv los ntawm kev kuaj xyuas qhov tsis muaj zog sib cuam tshuam ntawm cov qauv saum npoo thiab cov khoom me me ntawm lub zog-sensitive. Ib qho kawg ntawm microcantilever, uas yog rhiab heev rau lub zog me me, yog tsau, thaum lub microtip ntawm qhov kawg mus txog tus qauv thiab cuam tshuam nrog nws. Kev sib cuam tshuam quab yuam ua rau deformation lossis hloov pauv hauv lub xeev kev txav ntawm microcantilever.
Thaum kuaj cov qauv, cov ntsuas ntsuas pom cov kev hloov pauv no kom tau txais kev faib tawm ntawm kev sib cuam tshuam, thiab yog li cov ntaub ntawv txheej txheem nto nrog nanoscale daws teeb meem. AFM feem ntau muaj lub cantilever nrog lub ntsej muag ntse, lub ntsuas hluav taws xob cantilever, lub voj voog tawm tswv yim rau kev tswj cov lus tsa suab, lub piezoelectric ceramic scanner rau cov qauv scan, thiab lub computer tswj system rau cov duab nrhiav, tso saib thiab ua. Cov lus tsa suab ntawm microcantilever tuaj yeem kuaj pom los ntawm cov txheej txheem hluav taws xob xws li kev ntsuas qhov ntsuas tam sim no, lossis cov txheej txheem kho qhov muag nrog rau cov nqaj deflection thiab interferometry. Thaum lub taub yog txaus nyob ze rau cov qauv thiab luv-ntau repulsive rog muaj nyob nruab nrab ntawm lawv, nrhiav pom ntawm no repulsion enables nto imaging ntawm atomic daws teeb meem; qhov kev daws teeb meem feem ntau yog nyob rau theem nanometer. Kev ntsuas AFM txwv tsis pub muaj kev txwv tshwj xeeb ntawm cov qauv thiab tuaj yeem siv rau cov khoom siv, cov tshuab adsorbed thiab lwm yam.
