Characterizing nanoscale scanning probes using electron microscopy: A novel fixture and a practical guide

Area of Science:

• Materials Science
• Nanotechnology
• Analytical Chemistry

Background:

• Atomic Force Microscopy (AFM) probe tip geometry is critical for lateral resolution and quantitative analysis accuracy.
• Existing methods for probe tip characterization, like inverse imaging, have limitations.
• Direct imaging via electron microscopy (EM) offers advantages but has faced challenges with mounting and throughput.

Purpose of the Study:

• To develop and present a novel probe fixture for transmission electron microscopy (TEM).
• To enable repeatable, non-destructive imaging of multiple AFM probes.
• To facilitate accurate characterization of AFM probe tip geometry.

Main Methods:

• Design and fabrication of a specialized probe fixture for commercial TEM.
• Development of a reference grid for beam alignment within the fixture.
• Establishment of best practices for repeatable, non-destructive probe imaging.

Main Results:

• The fixture allows for repeatable mounting of multiple AFM probes.
• It includes a reference grid for efficient beam alignment.
• Demonstrated successful characterization of commercial AFM probes using the fixture.

Conclusions:

• The developed probe fixture significantly enhances the reliability and efficiency of EM-based AFM probe characterization.
• This method provides direct, accurate nanoscale geometry data, reducing uncertainty in AFM measurements.
• The fixture design and best practices are detailed for widespread adoption in nanoscale research.