Nano-scale simulative measuring model for tapping mode atomic force microscopy and analysis for measuring a...

Area of Science:

• Materials Science
• Nanotechnology
• Surface Science

Background:

• Atomic Force Microscopy (AFM) is crucial for nanoscale imaging.
• Tapping Mode AFM (TM-AFM) is widely used for surface characterization.
• Understanding edge effects in TM-AFM is vital for accurate measurements.

Purpose of the Study:

• To construct a nano-scale simulative measuring model for TM-AFM.
• To compare simulation results with experimental measurements, focusing on edge effects.
• To identify key factors contributing to surface errors in TM-AFM measurements.

Main Methods:

• Developed a simulative model using Morse potential and vibration theory for tip-sample interaction.
• Modeled the probe tip with Silicon (Si) atoms and the sample as a nano-scale ladder.
• Compared simulative measurements with experimental data.

Main Results:

• Identified scan rate and probe tip bevel angle as primary causes of surface error and edge effects.
• Found good agreement between simulated and experimental results for the sample edge's vertical section.
• Demonstrated that the bevel angle in simulations closely matched experimental observations.

Conclusions:

• The constructed TM-AFM simulative model is reasonable and effective.
• The model accurately predicts edge effects and surface errors in nano-scale measurements.
• This work provides a reliable tool for analyzing TM-AFM measurement inaccuracies.