Single-step electrochemical method for producing very sharp Au scanning tunneling microscopy tips

A single-step electrochemical method for making sharp gold scanning tunneling microscopy tips is described. 3.0 M NaCl in 1% perchloric acid is compared to several previously reported etchants. The addition of perchloric acid to sodium chloride solutions drastically shortens etching times and is sho...

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Veröffentlicht in:	Review of scientific instruments 2007-11, Vol.78 (11), p.113703-113703-4
Hauptverfasser:	Gingery, David, Bühlmann, Philippe
Format:	Artikel
Sprache:	eng
Schlagworte:	ELECTROCHEMISTRY Electrochemistry - methods Equipment Design Equipment Failure Analysis ETCHING GOLD Gold - chemistry Image Enhancement - instrumentation Image Enhancement - methods MATERIALS SCIENCE Microscopy, Scanning Tunneling - instrumentation Miniaturization Nanostructures - chemistry Nanostructures - ultrastructure PERCHLORIC ACID Reproducibility of Results SCANNING TUNNELING MICROSCOPY Sensitivity and Specificity SODIUM CHLORIDES SOLUTIONS Transducers TRANSMISSION ELECTRON MICROSCOPY
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Beschreibung
Zusammenfassung:	A single-step electrochemical method for making sharp gold scanning tunneling microscopy tips is described. 3.0 M NaCl in 1% perchloric acid is compared to several previously reported etchants. The addition of perchloric acid to sodium chloride solutions drastically shortens etching times and is shown by transmission electron microscopy to produce very sharp tips with a mean radius of curvature of 15 nm .
ISSN:	0034-6748 1089-7623
DOI:	10.1063/1.2804132