Note: Circuit design for direct current and alternating current electrochemical etching of scanning probe microscopy tips.

We present control circuits designed for electrochemically etching, reproducibly sharp STM probes. The design uses an Arduino UNO microcontroller to allow for both ac and dc operation, as well as a comparator driven shut-off that allows for etching to be stopped in 0.5-1 μs. The Arduino allows the instrument to be customized to suit a wide variety of potential applications without significant changes to hardware. Data is presented for coarse chemical etching of 80:20 platinum-iridium, tungsten, and nickel tips.

[1]  J. Yates,et al.  Reproducible Electrochemical Etching of Tungsten Probe Tips , 2002 .

[2]  I. Shvets,et al.  Atomically resolved p(3×1) reconstruction on the W(1 0 0) surface imaged with magnetic tips , 1999 .

[3]  M. S. Jeong,et al.  Efficient electrochemical etching method to fabricate sharp metallic tips for scanning probe microscopes , 2006 .

[4]  J. Llopis.  Corrosion of Platinum Metals and Chemisorption , 1969 .

[5]  L. Hsia,et al.  Optimization of AC Electrochemical Etching for Fabricating Tungsten Nanotips with Controlled Tip Profile , 2010 .

[6]  M. S. Jeong,et al.  Effects of process parameters on the electrochemical etching of sharp metallic tips with an attached mass. , 2007, The Review of scientific instruments.

[7]  Two step optimized process for scanning tunneling microscopy tip fabrication , 2010 .

[8]  Richard J. Colton,et al.  On the electrochemical etching of tips for scanning tunneling microscopy , 1990 .

[9]  S. Kandel,et al.  Ambient-pressure vapor deposition of octanethiol self-assembled monolayers. , 2005, Langmuir : the ACS journal of surfaces and colloids.

[10]  C. Zhang,et al.  Fabrication of silver tips for scanning tunneling microscope induced luminescence. , 2011, The Review of scientific instruments.

[11]  Bing-Feng Ju,et al.  Systematic study of electropolishing technique for improving the quality and production reproducibility of tungsten STM probe , 2009 .

[12]  K. Mørch,et al.  Preparation of platinum/iridium scanning probe microscopy tips , 1999 .

[13]  Bing-Feng Ju,et al.  The art of electrochemical etching for preparing tungsten probes with controllable tip profile and characteristic parameters. , 2011, The Review of scientific instruments.

[14]  Fabio Biscarini,et al.  Electrochemically etched nickel tips for spin polarized scanning tunneling microscopy , 2000 .

[15]  P. J. Bryant,et al.  Technique for shaping scanning tunneling microscope tips , 1987 .

[16]  M. Fotino.  Tip sharpening by normal and reverse electrochemical etching , 1993 .

[17]  I. Luzinov,et al.  Capillary and surface effects in the formation of nanosharp tungsten tips by electropolishing. , 2009, Langmuir : the ACS journal of surfaces and colloids.