High-speed multiparametric imaging through off-resonance tapping AFM with active probe

Area of Science:

• Surface science
• Nanotechnology
• Microscopy techniques

Background:

• Off-resonance tapping (ORT) mode atomic force microscopy (AFM) offers weak tip-sample interactions and quantitative property mapping.
• A key limitation of ORT-AFM is its slow scan speed, primarily due to low modulation frequencies.
• Existing ORT-AFM methods struggle to balance resolution with imaging speed.

Purpose of the Study:

• To enhance the scan speed of ORT-AFM.
• To overcome the low modulation frequency limitation in traditional ORT-AFM.
• To enable high-speed multiparametric imaging using an improved ORT-AFM technique.

Main Methods:

• Introduction of an active probe method for ORT-AFM.
• Direct actuation of the cantilever via induced strain from a piezoceramic film upon voltage application.
• Achieving significantly higher modulation frequencies compared to conventional ORT-AFM.

Main Results:

• The active probe method increased modulation frequency by over an order of magnitude.
• Demonstrated a substantial improvement in scan rate for ORT-AFM.
• Successfully performed high-speed multiparametric imaging.

Conclusions:

• The active probe method effectively addresses the slow scan speed limitation in ORT-AFM.
• This technique significantly boosts imaging efficiency without compromising imaging quality.
• The developed method paves the way for faster nanoscale characterization and analysis.