Figure 1

(a–b) A schematic illustration of the controllable preparation of an individual suspended SWCNT sample using a flow-guided chemical vapor deposition method. (c) The illustration shows the formation of the new core-shell structure by depositing ice around the SWCNTs, when the temperature-controlled stage maintained a cryogenic air environment. (d) An SEM image of suspended nanotubes that cross over the optical slit (indicated by white arrows) and three TEM slits (indicated by blue arrows). (e) Suspended nanotubes coated with ice became visible under an optical microscope as wires across the optical slits.