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Preparation of TEM Sample (English)
이름 : TEM | 작성일 : 2011.07.13 15:45 | 조회수 : 15215
 
 
 
TEM Sample Preparation for Inorganic Materials
• From transmission electron microscopy, people need thin (<100nm) samples
• How are we going to make TEM samples that thin from bulk materials like a brick or an airplane?
• Several methods -depends on initial form of materials and what information is needed Sample
 
Preparation –Hard Materials Samples
• Powders (particles, fibers)
• Bulk (stones, crashed planes)
• Semiconductors (computer chips, devices)
• How to prepare each of these?
 
 
Sample Preparation –Powders
• If particle size is small enough to be electron transparent on its own (<100nm):–Add small amount of powder in solvent–Ultrasonicateto disperse particles well–Place a small drop of suspension on carbon-coated grids–Different types of carbon: amorphous, holey, lacey (increasing pores)
• If particle size is larger:–Disperse particles in resin–Microtomeusing glass or diamond knives (depends on hardness of particles)?
 
 
Sample Preparation –Bulks
• Some specimens can be prepared by just using mortar and pestle to crush the specimen into tiny pieces and then suspend the small particles in anonaqueoussolvent, and then catch the particles on a carbon film TEM grid.
• Some specimens can be prepared by cutting the sample into thin slices using a diamond saw, then cutting 3-mm-diameter disks from the slice, thinning the disk on a grinding wheel, dimpling the thinned disk, then ion milling it to electron transparency.
 
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