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Single freestanding multi-wall carbon nanotubes on a nickel substrate. Physicists at Boston College have grown these structures for the first time on a grid pattern, which might permit the tubes to be used in field emission flat panel displays. It is not known why the tubes taper at the top, making them look like nanoscopic versions of the Washington Monument.
reported by: Ren et al., Applied Physics Letters, 23 August 1999