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Experimental setup for electrochemical etching to prepare a gold STM tip.
Optical micrographs of tips etched from a gold wire with radius of . Images show (a) an underetched tip (cut off current of 1 mA), (b) an optimal etched tip (cut off current of 0.5 mA), and (c) an overetched tip (cut off current of 0.05 mA).
The scanning electron micrographs of etched tip with apex radius of tens of nanometer achieved using the optimal cut off current value of 0.5 mA. The images show the tip at (a) low magnification and (b) high magnification.
The tip etching result and corresponding etching current.
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