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\subsubsection{\texorpdfstring{Carbon nanohorns}{Carbon nanohorns}}
\label{sec:carbon_nanohorns}


We have determined the stability, optimun geometry, and electronic
properties of nanometer-sized capped graphitic cones, called
,,nanohorns". Different nanohorn morphologies were considered, which
differe in the relative location of the five terminating pentagons.
Simulated scanning tunneling microscopy images of the various
structures at different bias voltages reflect a net electron transfer
towards the epntagon vertex sites. We found that the density of states
at the tip, ovservable by scanning tunneling spectroscopy, can be used
to discriminate between different tip structures.

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