[1] Mao C, Labean T H, Reif J H and Seeman N C 2000 Nature
407 493

[2] Rothemund P W K 2006 Nature 440 297

[3] Binnig G, Quate C F and Gerber C 1986 Phys. Rev. Lett.
56 930

[4] Rief M, Clausen-schaumann M and Gaub H E 1999 Nat. Struct.
Biol. 6 346

[5] Severin N, Barner J, Kalachev A A and Rabe J P 2004 Nano
Lett. 4 577

[6] Hansma H G,Vesenka J, Siegerist C et al 1992 Science
256 1180

[7] Lyubchenko Y, Shlyakhtenko L, Harrington R et al 1993 Proc.
Natl. Acad. Sci. USA 90 2137

[8] Tang T, Li J, Wang C and Bai C 2000 J. Vac. Sci.
Technol. B 18 1858

[9] BrettAMO and Chiorcea A 2003 Langmuir 19 3830

[10] Tanaka S, Maeda Y, Cai L T et al 2001 Jpn. J. Appl.
Phys. 40 4217

[11] Lagerqvist J, Zwolak M and Ventra M D 2006 Nano Lett.
6 779

[12] Zhou X F, Sun J, Guo Y et al 2005 Phys. Rev. E
71 062901

[13] Li J, Bai C, Wang C et al 1998 Nucl. Acids Res. 26
4785

[14] Wei G, Zhou H, Liu Z, Song Y et al 2005 J. Phys. Chem. B
109 8738

[15] Sasou M, Sugiyama S, Yoshino T and Ohtani T 2003 Langmuir
19 9845

[16] Hansma H G, Sinsheimer R L and Li M 1992 Nucl. Acids Res.
20 3585

[17] Moreno-Herrero F, Colchero L and Baro A M 2003
Ultramicroscopy 96 167

[18] Li X, Sun J, Zhou X et al 2003 J. Vac. Sci. Technol. B
21 1070

[19] Rozhok S, Sun P, Piner R et al 2004 J. Phys. Chem. B
108 7814

[20] Saenger W 1984 Principles of Nucleic Acid Structures (New
York: Springer)

[21] Tanaka K and Okahata Y 1996 J. Am. Chem. Soc. 118
10679

[22] Yang C, Moses D and Heeger A J 2003 Adv. Mater. 15
1364

[23] Greenall R J, Nave C and Fuller W 2001 J. Mol. Biol.
305 669

[24] Hu J, Zhang Y, Gao H, Li M and Hartmann M 2002 Nano Lett.
2 55

[25] Binggeli M and Mate C M 1995 J. Vac. Sci. Technol. B
13 1312