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Tungstate sharpening: A versatile method for extending the profile of ultra sharp tungsten probes
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10.1063/1.4797483
/content/aip/journal/rsi/84/3/10.1063/1.4797483
http://aip.metastore.ingenta.com/content/aip/journal/rsi/84/3/10.1063/1.4797483

Figures

Image of FIG. 1.
FIG. 1.

Shadowgraph images of the WO4 2− layer at various stages in probe fabrication. The difference in light/dark areas indicate where WO4 2− is flowing as in the diagram on the left, such that the etching converges to a sharp point.

Image of FIG. 2.
FIG. 2.

A cross section of a 3D model for the tungstate sharpening. The connection to the tungsten probe is electrically insulated from the KOH.

Image of FIG. 3.
FIG. 3.

Automated current analysis of typical tungstate sharpening with various etching regimes.

Image of FIG. 4.
FIG. 4.

Coulometric graph of tungsten removed for 2 different duty cycles showing repeatability.

Image of FIG. 5.
FIG. 5.

The typical range of lengths for short and long probes, their overall profile and the respective cut-off currents.

Image of FIG. 6.
FIG. 6.

SEM images for the apex profile and a 15 nm radius probe tip.

Image of FIG. 7.
FIG. 7.

STM image of HOPG crystal lattice in air at room temperature. Voltage bias: 770 mV.

Image of FIG. 8.
FIG. 8.

Set-up for mechanically stirred tungstate sharpening (enhanced online). [URL: http://dx.doi.org/10.1063/1.4797483.1]doi: 10.1063/1.4797483.1.

Image of FIG. 9.
FIG. 9.

Hydrolysis stirring using bubbles to clean the probe surface (enhanced online). [URL: http://dx.doi.org/10.1063/1.4797483.2]doi: 10.1063/1.4797483.2.

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/content/aip/journal/rsi/84/3/10.1063/1.4797483
2013-03-28
2014-04-17
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Tungstate sharpening: A versatile method for extending the profile of ultra sharp tungsten probes
http://aip.metastore.ingenta.com/content/aip/journal/rsi/84/3/10.1063/1.4797483
10.1063/1.4797483
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