Efficient Transfer Doping of Carbon Nanotube Forests by MoO3

Santiago Esconjauregui, Lorenzo D’Arsié, Yuzheng Guo, Junwei Yang, Hisashi Sugime, Sabina Caneva, Cinzia Cepek & John Robertson
We dope nanotube forests using evaporated MoO3 and observe the forest resistivity to decrease by 2 orders of magnitude, reaching values as low as ∼5 × 10–5 Ωcm, thus approaching that of copper. Using in situ photoemission spectroscopy, we determine the minimum necessary MoO3 thickness to dope a forest and study the underlying doping mechanism. Homogenous coating and tube compaction emerge as key factors for decreasing the forest resistivity. When all nanotubes are fully coated...
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