Figure 2. Pathway of transformation of a-C nanorods into ordered
nanostructures. The first step of the transformation, a-C nanorod-toopened
tube or PUNT, is common for all a-C wires. Depending on the
line density and heating temperature, i.e., the location of the phase
diagram in Figure 1, the transformation at final stage can be either
PUNT-to-CNT or PUNT-to-GNR