Abstract
Highly dendritic graphene crystals up to 0.25 mm in diameter are synthesized
by low pressure chemical vapor deposition inside a copper enclosure. With their
sixfold symmetry and fractal-like shape, the crystals resemble snowflakes. The
evolution of the dendritic growth features is investigated for different growth
conditions and surface diffusion is found to be the growth-limiting step
responsible for the formation of dendrites. The electronic properties of the
dendritic crystals are examined down to sub-Kelvin temperatures, showing a
mobility of up to 6300 cm$^2$V$^-1$s$^-1$ and quantum Hall oscillations are
observed above 4T. These results demonstrate the high quality of the transport
properties despite their rough dendritic edges.
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