Nanotech 2010

High resolution imaging of biological materials using hydrophobic carbon nanotube AFM probes

J.-H. Lee, C.K. Najeeb, J. Chang, W.-S. Kang, G.-H. Nam, J.-H. Kim
Ajou University, KR

Keywords: hydrophobic, CNT-probe, high resolution AFM imaging, Langmuir-Blodgett technique


Carbon nanotube (CNT) tipped atomic force microscope (AFM) probes have shown a significant potential for obtaining high resolution imaging of nanostructure and biological materials. In this work, we report a simple method to fabricate single-walled carbon nanotube (SWNT) nano-probes for atomic force microscopy (AFM) using the Langmuir-Blodgett (LB) technique. Moreover, to obtain hydrophobic property of SWNT-AFM probes with a capability of high resolution imaging in atmospheric and high relative humidity conditions, the SWNT-AFM probe was modified through vapor deposition of trichloro[1H, 1H, 2H, 2H,-perfluorotyl]silane (FTOS). Using this FTOS-modified SWNT-AFM probe, a high resolution image of plasmid DNA standard sample was acquired. The measured dimension of plasmid DNA had a middle width of 4~5 nm (true width 2nm). We demonstrate that the FTOS-modified SWNT-AFM probes have extremely high resolution imaging capability, which allows to measure higher resolution images than with conventional AFM probe.
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