Fig. 6.
How to form vertical SWNT films on a wide range of substrates. (A) Photograph of a V-SWNT film free-floating on water after being lifted off from a SiO2/Si substrate by HF etching of the SiO2 layer underlying the SWNTs. (Right) A schematic drawing of the free-floating SWNT film with nanotubes held together by van der Waals interactions. (B) SEM image of a vertical SWNT film after transferring onto a copper substrate with a thin polymer-binding layer at the Cu–SWNT interface. (Inset) A photograph showing a vertical SWNT film (black) on Cu. (Right) A schematic drawing depicting the vertical nanotube film and the Cu interface.