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(Color online) Differential roll printing. (a) Schematic of the DRP setup. (b) Optical photograph of the assembled apparatus used in this work (top view). The inset shows the blank and NW coated glass tubes used as the rollers (I and II, respectively).
(Color online) Parallel arrayed NW printing. (a)–(b) Optical dark field and (c) SEM images of GeNWs printed on a substrate. (d) Large area and aligned arrays of GeNWs printed on glass and photography paper. The substrates were patterned using photolithography and functionalized with poly-L-lysine (see Ref. 16) before printing to enable patterned assembly of NWs (shown as the gray regions).
(Color online) NW printing modulation by wheel size ratio. The percentage of the aligned NWs for various roller to wheel size ratios. The inset shows the NW density as a function of the wheel size ratio.
(Color online) Parallel arrayed NW FETs. characteristic of a representative parallel arrayed NW FET with Nickel S/D and G metal contacts and a top-gated configuration ( by atomic layer deposition) on a plastic substrate. The bottom inset shows the schematic of the NW device structure and the top inset is a photograph of the substrate after NW device fabrication.
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