Carbon-Nanotube Tip for Highly-Reproducible Imaging of Deoxyribonucleic Acid Helical Turns by Noncontact Atomic Force Microscopy

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Copyright (c) 2000 The Japan Society of Applied Physics
, , Citation Takayuki Uchihashi Takayuki Uchihashi et al 2000 Jpn. J. Appl. Phys. 39 L887 DOI 10.1143/JJAP.39.L887

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Author affiliations

1 Joint Research Center for Atom Technology (JRCAT), Angstrom Technology Partnership (ATP),

2 1-1-4 Higashi, Tsukuba, Ibaraki 305-0046, Japan

3 Department of Physics and Electronics, Osaka Prefecture University, 1-1 Gakuen-cho, Sakai,

4 Osaka 599-8531, Japan

5 JRCAT, National Institute for Advanced Interdisciplinary Research (NAIR), 1-1-4 Higashi,

6 Tsukuba, Ibaraki 305-8562, Japan

7 Department of Electronic Engineering, Graduate School of Engineering, Osaka University,

8 2-1 Yamada-oka, Suita, Osaka 565-0871, Japan

Dates

  1. Received 16 May 2000
  2. Accepted 28 June 2000

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Abstract

A carbon nanotube (CNT) was used as a tip for a noncontact-mode atomic force microscope (NC-AFM). A CNT tip was attached to an Au/Si tip by a well-controlled procedure in a scanning-electron-microscope (SEM) chamber. The NC-AFM with the CNT tip produced highly reproducible images of right-handed helical turns of linear deoxyribonucleic acid (DNA) with a spacing of 3.5 ±1.0 nm. The full-width at half-maximum (FWHM) of the cross section of DNA measured was 3.1 ±0.6 nm.

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10.1143/JJAP.39.L887