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Title of article :
Confinement of the field electron emission to atomic sites on ultra sharp tips
Author/Authors :
Moh’d Rezeq، نويسنده , , Moh’d and Joachim، نويسنده , , Christian and Chandrasekhar، نويسنده , , N.، نويسنده ,
Issue Information :
هفته نامه با شماره پیاپی سال 2009
Pages :
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Abstract :
The spatially controlled field assisted etching method for sharpening metallic tips, in a field ion microscope (FIM), is used to study the evolution of the field emission when the tip apex radius is decreased below 1 nm. Unlike the conventional image formation in a field emission microscope (FEM), we demonstrate that at this scale the field emission is rather confined to atomic sites. A single atom apex fabricated at the end of such tips exhibits an outstanding brightness compared to other atomic tips. The measurements have been repeated for two double atom tips, with different atom-atom separations, and images of atomic field emission localization have also been obtained. We have found that the field emission intensity alternates between adjacent atoms when the applied voltage is gradually increased beyond a threshold value.
Keywords :
Field emission microscopy , Nanotips , Electron emission , Atomic localization , Field ion microscopy
Journal title :
Surface Science
Link To Document :