Figure 2

Three techniques for guided self-assembly of horizontally aligned arrays of synthesized NWs. (a) Schematic illustration of Langmuir–Blodgett assembly of NWs at a liquid-air interface (top), and image of aligned NWs (bottom). Reprinted with permission from Yang.⁵¹ Copyright 2003 Nature Publishing Group. (b) Inflated bubble of polymer with embedded NWs (top). Contacting a substrate transfers aligned NWs (bottom). The insets provide magnified views. Reprinted with permission from Yu et al.⁶⁶ Copyright 2007 Nature Publishing Group. (c) Schematic illustration of dry contact transfer of NWs from a source to a receiving substrate in a roller press, by use of directional shear forces (top) and image of transferred NWs (bottom) on a wafer, with magnified views of representative regions. Reprinted with permission from Fan et al.⁶⁸ Copyright 2009 WILEY-VCH.