Fig. 1
From: Engineering plants with carbon nanotubes: a sustainable agriculture approach
Schematic illustration of the structure and morphology of CNTs. A Scanning electron microscope (SEM) image of a zigzag shaped SWCNT [74]. B Transmission electron microscope (TEM) image of a MWNT containing a concentrically nested array of nine SWNTs [75]. C SEM image of large amount of helically coiled CNTs [76]. D TEM images of typical coiled CNTs with a nanobell structure [77]. E SEM images of the coiled CNTs > 20 mm in length [77]. F SEM image of array of CNTs grown with zigzag morphology using a three-stage growth process [78]