Carbon nanobud
In nanotechnology , a carbon nanobud is a material that combines carbon nanotubes and spheroidal fullerenes , both allotropes of carbon , in the same structure , forming "buds" attached to the tubes . 
<triplet> carbon nanotube <subj> carbon <obj> made from material <subj> allotropes of carbon <obj> instance of <triplet> fullerene <subj> allotropes of carbon <obj> subclass of