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efficient, scalable approach for the ordered, uniform assembly of NW arrays on substrates for integration in multifunctional circuits.

ROLL PRINTING OF NANOWIRES ON SUBSTRATES

We recently developed an NW roll-printing technology to address the need for large-scale assembly of aligned NW arrays on foreign substrates (Fan et al., 2008b; Yerushalmi et al., 2007). The overall process involves (1) optimized catalytic growth of the desired crystalline NWs by CVD on a cylindrical substrate (i.e., roller), and (2) patterned transfer of NWs directly from the roller to a receiver substrate via differential roll printing, as illustrated in Figure 1.

FIGURE 1 Differential roll printing of NWs. (a) Schematic drawing of the printing setup. (b) Optical photograph of the assembled apparatus (top view). The inset shows the blank and NW-coated glass tubes used as rollers (I and II, respectively). (c) The NW alignment and density (inset) as a function of roller-to-wheel size ratio. (d) The alignment of the printed film is nearly independent of NW length. Source: Yerushalmi et al., 2007. Reprinted with permission.

FIGURE 1 Differential roll printing of NWs. (a) Schematic drawing of the printing setup. (b) Optical photograph of the assembled apparatus (top view). The inset shows the blank and NW-coated glass tubes used as rollers (I and II, respectively). (c) The NW alignment and density (inset) as a function of roller-to-wheel size ratio. (d) The alignment of the printed film is nearly independent of NW length. Source: Yerushalmi et al., 2007. Reprinted with permission.



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