In Field ion microscopy (FIM), polycrystalline tungsten nanotip is (110) oriented tip. under the gas etching process, the nanotip becomes more sharp by reducing the atomic layer. During the etching process, how the atomic layer can migrate from (110)-type plane to (111)-type plane at the end of nanotip (in the first layer) in polycrystalline tungsten under the high voltage?
Riaz A. Khan
Atoms leave the upper layer under high voltage and etching conditions, nearly like the vapor layer over the area and can be drifted away with more voltage and harsher etching conditions.
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