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An atomic force microscope picture of three gold electrodes (the yellow lines, A, B, C) spanned by a 1-nm-high single-wall carbon nanotube (red line). The nanotube is half doped and half un-doped, and shows a rectifier (that is, diode) behavior by allowing current in one direction only.
reported by: Antonov and Johnson in Physical Review Letters, 18 October, 1999. (Courtesy of A.T. Johnson, University of Pennsylvania.)