Journal
NANO LETTERS
Volume 11, Issue 8, Pages 3295-3300Publisher
AMER CHEMICAL SOC
DOI: 10.1021/nl201655c
Keywords
Scrolled graphene and multiwalled CNTs; electrical and mechanical properties; in situ transmission electron microscope measurements
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Funding
- Japan Society for the Promotion of Sciences (JSPS)
- German Academic Exchange Service (DAAD)
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The electrical and mechanical properties of multiwalled carbon nanotubes and of scrolled graphene structures, synthesized from iron-phthalocyanine in a catalytic chemical vapor deposition process, were investigated in situ in a transmission electron microscope. These experiments enabled us to get a more detailed quantitative picture of the peculiarities of the two different types of carbon nanostructures. The nanoscrolls showed superior conductance >10G(o), against <= 1G(o) of the nested tubes, and a much enhanced electric sustainability (similar to 10(8) A/cm(2)). While the pronounced nonlinear increase in current in the nested tube structure with increasing applied voltage is directly related to an increasing number of tubes involved, the electric breakdown has correspondingly been characterized by fractional ablation of the successive layers. Scrolls, on the contrary, do not show any fractional electric response. Mechanical bending has been found easier with scrolled graphenes than with nested tubes. This observation confirms the prediction of higher flexibility of the scroll structure in interesting phenomena like intercalation and electroactuation.
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