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Preparation of Samples for Electron Microscopy

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To be visualized by an electron microscope, either transmission or scanning, biological samples need to be fixed (stabilized) so the electron beam does not destroy them and dried thoroughly (desiccated/dehydrated) so the vacuum does not affect them. Fixation needs to be done as quickly as possible because the sample properties will start changing as soon as it is removed from its natural environment. For example, in a tissue sample, the oxygen levels begin decreasing, causing an altered...

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Scanning-probe Single-electron Capacitance Spectroscopy

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Published on: July 30, 2013

Note: A simple, convenient, and reliable method to prepare gold scanning tunneling microscope tips.

Guoguang Qian¹, Swatilekha Saha, K M Lewis

¹Department of Physics, Applied Physics, and Astronomy, Rensselaer Polytechnic Institute, Troy, New York 12180, USA.

The Review of Scientific Instruments

|February 2, 2010

Summary

A straightforward electrochemical etching method prepares gold tips for scanning tunneling microscopy. This technique uses basic equipment and avoids hazardous chemicals for accessible tip fabrication.

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Area of Science:

Materials Science
Surface Science
Analytical Chemistry

Background:

Scanning tunneling microscopy (STM) requires sharp conductive tips for high-resolution imaging.
Traditional methods for preparing STM tips can be complex, expensive, or involve hazardous materials.
There is a need for simpler, safer, and more accessible tip preparation techniques.

Purpose of the Study:

To introduce a simple and safe method for preparing gold tips for STM.
To demonstrate the use of basic laboratory instrumentation for tip preparation.
To provide a procedure for optimizing etching parameters.

Main Methods:

Electrochemical etching of gold wire using a non-hazardous electrolyte.
Utilizing basic laboratory equipment with controlled current limits for etching.
Characterization of prepared tips using optical microscopy and scanning electron microscopy (SEM).

Main Results:

Successfully prepared gold tips suitable for STM applications.
Demonstrated control over the etching process through current limitation.
Verified tip quality and morphology using optical and SEM analyses.

Conclusions:

The developed electrochemical etching method offers a simple, safe, and cost-effective alternative for preparing gold STM tips.
The technique is accessible using standard laboratory equipment, reducing the need for specialized apparatus.
This method facilitates broader adoption of STM by simplifying tip preparation.