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Breaking the Speed Limit of Chemical-Structure Imaging with Enhanced Force Sensitivity
Yuuki Yasui1, Yoshiaki Sugimoto1
1The University of Tokyo, Kashiwa, Department of Advanced Materials Science, Chiba 277-8561, Japan.
Physical Review Letters
|August 10, 2026
Summary
Atomic force microscopy (AFM) now images single molecules 60x faster using a Si cantilever in its second resonance mode. This breakthrough enables direct visualization of molecular bonds and advances nanoscale chemical structure analysis.
Area of Science:
- Nanotechnology
- Surface Science
- Chemical Physics
Background:
- Atomic force microscopy (AFM) offers molecular-level chemical structure resolution.
- Current AFM methods are limited by slow imaging speeds and constant-height operation constraints.
Purpose of the Study:
- To overcome speed and operational limitations in AFM for molecular imaging.
- To enhance AFM's capability for resolving chemical structures and dynamics.
Main Methods:
- Utilized a silicon (Si) cantilever operated in its second resonance mode.
- Achieved exceptional force sensitivity for high-speed, constant-height imaging.
Main Results:
- Demonstrated robust, constant-height chemical-structure imaging at speeds up to 200 nm/s (over 60x faster).
- Resolved molecular bonds directly using constant-frequency-shift topography.
- Enabled imaging of nonplanar systems and 3D molecules.
Conclusions:
- The developed AFM technique significantly enhances imaging speed and sensitivity.
- Opens new possibilities for studying complex molecular structures and chemical reaction dynamics.
- Advances the field of nanoscale chemical analysis and surface science.
