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(Color) (a) The upper panel shows curves of the DWNT-FET under the influence of ambient air condition with various source-drain voltages. A schematic drawing of the device is given in inset. (b) Scanning electron microscopy figure of the DWNT-FET and high-resolution transmission electron microscopy figure of DWNT used for this work.
(Color) Transfer characteristics of DWNT-FET under ambient air, vacuum of , and at intermediate pumping stages.
(Color) Schematic band structure of the carbon nanotube (blue) and the LUMO level of the adsorbators (red), with respect to the Fermi level.
(Color) Adsorption geometry of oxygen molecule on the wall of the (10,0) nanotube and ab initio band structure the oxygen adsorbed nanotube system. Arrows in (b) indicate oxygen molecular states.
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