Theoretical model and experimental study on environmental dissipation mechanism of tapping mode atomic force...

Area of Science:

• Physics
• Materials Science
• Surface Science

Background:

• Tapping mode atomic force microscopy (TM AFM) phase imaging is influenced by probe-sample interactions.
• Energy dissipation during these interactions is a critical factor in phase contrast.
• Understanding environmental contributions is key to interpreting TM AFM data.

Purpose of the Study:

• To investigate the impact of external environmental factors on energy dissipation in TM AFM.
• To quantify the contributions of air viscous damping, squeeze film damping, and liquid bridge force.
• To correlate experimental findings with theoretical models for improved phase imaging interpretation.

Main Methods:

• Utilized the tune test method within TM AFM.
• Systematically varied probe position and ambient humidity.
• Measured and analyzed theoretical and experimental quality factors.

Main Results:

• Quantified energy dissipation through air viscous damping, squeeze film damping, and liquid bridge force.
• Developed a model based on these damping mechanisms, showing rational agreement with experimental data.
• Identified distinct dominant energy dissipation mechanisms at different probe positions and humidity levels.

Conclusions:

• Environmental conditions significantly alter energy dissipation mechanisms in TM AFM.
• The established theoretical model provides a rational basis for understanding experimental observations.
• Results offer critical insights for both experimental and theoretical advancements in TM AFM phase imaging.