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May 2012

Volume 30, Issue 3, Articles (03xxxx)

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J. Vac. Sci. Technol. B 30, 03D111 (2012); http://dx.doi.org/10.1116/1.3699011 (5 pages)

Yusuke Yamashiro, Yasuhide Ohno, Kenzo Maehashi, Koichi Inoue, and Kazuhiko Matsumoto
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High-percentage success method for preparing and pre-evaluating tungsten tips for atomic-resolution scanning tunneling microscopy

James K. Schoelz, Peng Xu, Steven D. Barber, Dejun Qi, Matthew L. Ackerman, Gobind Basnet, Cameron T. Cook, and Paul M. Thibado

J. Vac. Sci. Technol. B 30, 033201 (2012); http://dx.doi.org/10.1116/1.3701977 (5 pages) | Cited 7 times

Online Publication Date: 6 April 2012

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A custom double-lamella method is presented for electrochemically etching tungsten wire for use as tips in scanning tunneling microscopy (STM). For comparison, tips were also manufactured in-house using numerous conventional methods and examined using an optical microscope. Both sets of tips were used to obtain STM images of highly oriented pyrolytic graphite, the quality of which varied. The clarity of the STM images was found to be correlated to the optically measured cone angle of the STM tip, with larger cone angles consistently producing atomically resolved images. The custom etching procedure described allows one to create larger cone angles and consequently proved superior in reliably producing high-quality tips.
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07.79.Cz Scanning tunneling microscopes
81.65.Cf Surface cleaning, etching, patterning
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