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New paper on electrochemical etching of sharp Iridium tips

posted Nov 11, 2011, 6:38 AM by William Paul   [ updated Dec 22, 2011, 12:02 PM by SPM Evaporator ]

Note: Electrochemical etching of sharp iridium tips
Rev. Sci. Instrum. 82, 116105 (2011); doi:10.1063/1.3662473

Jean-Benoît LalanneWilliam PaulDavid Oliver, and Peter H. Grütter

We describe an etching procedure for the production of sharp iridium tips with apex radii of 15–70 nm, as determined by scanning electron microscopy, field ion microscopy, and field emission measurements. A coarse electrochemical etch followed by zone electropolishing is performed in a relatively harmless calcium chloride solution with high success rate.