Sharpening method of nanotubes
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United States of America Patent
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Aug 17, 2004
Grant Date -
Oct 2, 2003
app pub date -
Mar 18, 2003
filing date -
Mar 18, 2002
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A method for sharpening a nanotube including the steps of: connecting the base end portion of a nanotube to an electrode with the tip end portion of the nanotube protruded from the electrode; connecting the tip end portion of the nanotube to another electrode; applying a voltage between the electrodes so as to cause an electric current to flow in the middle portion of the nanotube which is located between the two electrodes; evaporating constituent atoms of the nanotube layer by layer from a evaporation starting region, which is located in the middle region of the nanotube (and can be a crystal defect region, or a curved portion), by the heat generated by the electric current, thus reducing the diameter of the evaporation starting region; and cutting the evaporation starting region that has the reduced diameter, thus forming a sharpened end on the nanotube.
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