A scanning tunneling microscope (STM) for biological applications: design and performance.

Area of Science:

• Biophysics
• Microscopy
• Materials Science

Background:

• Traditional scanning tunneling microscopy (STM) often requires vacuum conditions, limiting its application in biological studies.
• There is a need for STM systems that can operate under ambient conditions to study biological samples in a more natural state.

Purpose of the Study:

• To describe the design and performance of a new scanning tunneling microscope (STM) specifically adapted for biological applications.
• To integrate an auxiliary light microscope for improved specimen targeting and identification.
• To evaluate the suitability of various conductive films as specimen supports for biological samples.

Main Methods:

• The study details the construction of an ambient-pressure scanning tunneling microscope (STM).
• The system incorporates an auxiliary light microscope for sample navigation.
• Performance was validated using gold and graphite standards, and conductive films (carbon, platinum/carbon) on glass/mica were assessed as specimen supports.

Main Results:

• The developed scanning tunneling microscope (STM) operates effectively at ambient pressure.
• Evaporated carbon and platinum/carbon films on glass or mica were found suitable as specimen supports.
• Initial successful applications on biological material coated with platinum/carbon are demonstrated.

Conclusions:

• The designed scanning tunneling microscope (STM) is suitable for biological applications under ambient pressure.
• The integrated light microscope enhances usability for biological sample analysis.
• The system provides a viable platform for high-resolution imaging of biological specimens.