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Preparation and characterization of tips for scanning tunneling microscopy of biological specimens

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Hacker, B., Hillebrand, A., Hartmann, T., & Guckenberger, R. (1992). Preparation and characterization of tips for scanning tunneling microscopy of biological specimens. Ultramicroscopy, 42(44), 1514-1518.


Cite as: http://hdl.handle.net/11858/00-001M-0000-0010-7405-2
Abstract
For scanning tunneling microscopy of biological samples a thin, sharp tip is necessary to resolve the highly corrugated structures of biomacromolecules. By DC etching of tungsten wire in NaOH the authors obtain tip radii of 5 nm or less in more than 50% of all cases. For tunneling in fluids these tips are insulated by a wax-coating to minimize faradaic currents. Resulting leakage currents are in the range of 5 to 50 pA. (6 References).