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Get to know the onion: Conductance measurements for functionalized carbon nano-onions were conducted using an STM-based molecular junction approach (see picture). It was found that electron transmission through these systems occurs by a tunneling mechanism. The carbon-based core seems to provide a very efficient medium for electron transmission, with conductance values comparable to those of metallic nanowires.
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Sęk et al. (2012) studied this question.
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