Multifrequency AFM integrating PeakForce tapping and higher eigenmodes for heterogeneous surface characterization

Area of Science:

• Materials Science
• Nanotechnology
• Surface Science

Background:

• Multimodal atomic force microscopy (AFM) is crucial for nanoscale characterization.
• Distinguishing material compositions in heterogeneous nanomaterials often requires complex AFM setups and probe selection.

Purpose of the Study:

• To develop a simplified multifrequency AFM technique integrating PeakForce tapping with higher eigenmode vibrations.
• To achieve simultaneous high-resolution topographical imaging and material composition differentiation.

Main Methods:

• Employed non-resonant and higher eigenmode frequencies in conjunction with PeakForce tapping mode.
• Applied higher eigenmode vibrations at low amplitudes to avoid interference with topographical and nanomechanical mapping.

Main Results:

• Successfully achieved simultaneous high-resolution topographical imaging and compositional mapping.
• Demonstrated that low-amplitude higher eigenmode vibrations do not significantly disrupt standard PeakForce tapping measurements.
• Showcased effective compositional differentiation in heterogeneous nanomaterials.

Conclusions:

• The novel multifrequency AFM technique simplifies probe selection for material differentiation.
• This integrated approach enhances practicality and broadens probe compatibility for advanced nanomaterial analysis.