Disordered carbon-black/polymer composites form microscopic
three-dimensional percolative electrical networks. These
composites have widespread commercial applications. We have
directly imaged the conductive network at the surface of these
composites using an Electric Force Microscope. We can quantify
the geometry of the conductive network to a resolution of 100 nm.
This technique could be useful in the future construction of
nanometer-scale electronic circuits.