. "Roll Printing of Crystalline Nanowires for Integrated Electronic and Sensor Arrays--Ali Javey, Zhiyong Fan, Johnny C. Ho, and Roie Yerushalmi." Frontiers of Engineering: Reports on Leading-Edge Engineering from the 2008 Symposium. Washington, DC: The National Academies Press, 2009.
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Frontiers of Engineering: Reports on Leading-Edge Engineering from the 2008 Symposium
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.