Nanotube adhesive sticks better than a gecko's foot

Microfabricated aligned multiwalled carbon nanotube setae and spatulas. (A) Optical picture of gecko foot showing that the setae are arranged in many lobes along the foot. (B) SEM image of natural gecko setae terminating into thousands of smaller spatulas. (E–H) SEM images of synthetic setae of width 50 (E), 100 (F), 250 (G), and 500 (H) µm. (C and D) Side views (C) and higher magnification SEM image (D) of the 100 µm setae. Image courtesy of the University of Akron.