Abstract
Holes and carbon dots on a nanometer scale are formed on highly oriented pyrolytic graphite (HOPG) surfaces by scanning tunneling microscopy (STM). A hole of 25 Å in diameter and 7 Å in depth at the center is made by applying a voltage pulse (+10 V, 0.1 ms) on the graphite surface in air. A carbon dot of 8 Å in diameter and 7 Å in height is deposited by applying a short voltage pulse (+4 V, 50 μs) in a mixed gas of acetone and hydrogen at 20 Torr. The results indicate the possibility of nanostructure fabrication by an ångström-size electron beam emitted from a STM tip presumably through reactions with ambient gas molecules.
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