DNA NANOTECHNOLOGY AND ITS BIOLOGICAL APPLICATIONS - Bio-Inspired and Nanoscale Integrated Computing - page 363

(a) (b)

0.15

Metallized 4 × 4 ribbon

0.10

0.05

Drain

Source

0.00

− 0.05

Silicon oxide

− 0.10

Silicon − 0.15

− 0.10 − 0.05 0.00 0.05 0.10

Voltage (V)

(c) (d)

Figure 13.8. DNA-templated fabrication of metal nanowires.

used for attaching molecular electronic devices to 2D or 3D DNA nanostructures.
See Figure 13.8 [14] for an example of conductive wires composed of self-assembled
DNA tubes covered with gold or silver.
Figure 13.8a is a SEM image of bare self-assembled DNA nanotube on silicon
oxide surface (scale bar equals 500 nm). Figure 13.8b is a SEM image of a gold-
coated DNA nanotube on silicon oxide surface (scale bar equals 500 nm). Figure
13.8c is a schematic representation of the measured device (inset of Figure 13.8d)
showing the tempated nanowire and source and drain electrodes fabricated by
electron beam lithography. Figure 13.8d gives the current/voltage curve of a gold
nanowire. Smaller, smoother silver nanowires are presented in [14, 15].

13.6.2. Methods for Programmable Assembly
of Patterned 2D DNA Lattices
The first experimental demonstration of 2D DNA lattices by Winfree and Seeman
provided very simple patterning by repeated stripes determined by a stem loop