The formation of rings composed of uniformly sized triple-walled carbon nanbtubes has been demonstrated and characterized by high resolution transmission electron microscopy. These rings are found in the products from acetylene decomposition on Fe/MgO catalyst in a fluidized bed. This finding expands the libratory of building blocks based on nanotubes and demonstrates the existence of crystalline structures from complex multiwalled carbon nanotubes.
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Key Laboratory of Green Reaction Engineering and Technology, Department of Chemical Engineering, Tsinghua University, Beijing 100084, People's Republic of China;
