Hitachi S4700 Field Emission Microscope
What the heck is a Scanning Electron MicroscopeIt is a microscope that uses electrons to provide a light source for the magnification of objects.
Why does it look different than a regular microscopeElectrons are very small and need a vacuum to work properly. If an electron hits an atom of anything it will loose direction and not be available to illuminate the object.
Electrons are produced by a gun or source
They are accelerated down the column that is under vacuum
Then focused by magnetic lenses
The beam of electrons are then moved across the object by the scanning coils.
As the electrons move across the object they cause electrons to eject from the specimen
These new electrons are detected and reconstructed to produce an image on a screen.
Different guns are similar to different watt light bulbs, less wattage less light and lower resolution.
Are there different types of Electron GunsIncreasing BrightnessTungsten FilamentLaB6 Single CrystalField Emission Tungsten Single Crystal
So What Do Scanning Electron Microscopes Look AtScanning Electron Microscopes allow us to see things that are very small
http://www.eoearth.org/article/Nanoparticles
The Hitachi S4700 is a Field Emission Scanning Electron MicroscopeIt has a resolution of 2.3 nm, about 0.00003 the size of a human hair. Magnification range is 250x-500,000x. Typical magnifications used 250x-200,000xSamples include:
Thin filmsCeramicsMetalsBiologicalCompositesPolymers76.6m
Thin FilmsEpitaxial Thin films on gold single crystalPhoto resist in vias in a silicon wafer
CeramicsCarbon NanotubesHigh Temperature Ceramics, Titanium Diboride
MetalsPhase contrast on heat treated PtFracture surface after tensile testing
CompositesPolymer added to glass for strengthGlass bead chemically altered to hydroxy apatite, bone material
PolymersPolyurea aerogelTitanium dioxide particles in epoxy for added strength
Elemental MicroanalysisAl Cu
Ca PbThe Hitachi S4700 is equipped with an Energy Dispersive Spectrometer for elemental microanalysis determinations.
Interesting Crystal Shapes
Top Related