Dendrites precipitated from cobalt
This cobalt fragment supports an interesting variety of graphene structures precipitated during swift cooling under high vacuum. Notice the sharp boundary between the dark and light halves. Raman analysis detects graphitic carbon on the dark half. The dendrites provide evidence of graphene covering the light half.
These dendrites from the top of the cobalt fragment indicate the presence of carbon, although it is too thin to detect by Raman analysis. Samples prepared without carbon lack dendrites.