IEC 216 |
Fabrication and control of self-assembly nanopattern
| Takashi Kanno, Shin-ichj Tanaka, Hiroyuki Tanaka, and Tomoji Kawai. ISIR-Sanken, Osaka University, 8-1 Mihogaoka, Ibaraki Osaka, 567-0047, Japan |
Self-assembly method has lately attracted considerable attention as a simple, low-cost and wide-range bottom-up technique. But, this method is hard to control. To control the self-assembly formation, we must know its mechanism. Two-dimensional DNA network structure (fig. a) is successfully fabricated by deposition of a DNA solution on hydrophilic mica surfaces. After standing on the surfaces for 1 min, surplus sample solution is blown off with air. However boundary layer remain so thick on hydrophilic surfaces that DNA in the remaining solution can entangle each other and conform network structure automatically as the solvent dries. And we have found the mesh size can be controlled by changing the concentration of DNA. While, two-dimensional DNA array structure (fig. b and c) is fabricated by deposition of a hot DNA solution on hydrophobic graphite surfaces. This structure reflects the crystallographic orientation of graphite surfaces. |
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