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Related Concept Videos

Atomic Force Microscopy01:08

Atomic Force Microscopy

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Atomic force microscopy (AFM) is a type of scanning probe microscopy that can analyze topographic details of various specimens like ceramics, glass, polymers, and biological samples. AFM offers over 1000 times more resolution than the optical imaging system. Images generated from AFM are three-dimensional surface profiles, offering an advantage over the flat, two-dimensional images from other imaging techniques.
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Overview of Microscopy Techniques01:22

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The early pioneers of microscopy opened a window into the invisible world of microorganisms. In 1830, Joseph Jackson Lister created an essentially modern light microscope. The 20th century saw the development of microscopes that leveraged nonvisible light, such as fluorescence microscopy that uses an ultraviolet light source and electron microscopy that uses short-wavelength electron beams. These advances significantly improved magnification, image resolution, and contrast. By comparison, the...
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Double Resonance Techniques: Overview01:12

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Double resonance techniques in Nuclear Magnetic Resonance (NMR) spectroscopy involve the simultaneous application of two different frequencies or radiofrequency pulses to manipulate and observe two distinct nuclear spins. One important application of double resonance is spin decoupling, which selectively suppresses coupling with one type of nucleus while observing the NMR signal from another nucleus, simplifying the spectrum and enhancing resolution.
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Related Experiment Video

Updated: Aug 7, 2025

High-Speed Atomic Force Microscopy Imaging of DNA Three-Point-Star Motif Self Assembly Using Photothermal Off-Resonance Tapping
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High-speed multiparametric imaging through off-resonance tapping AFM with active probe.

Peng Li1, Yongjian Shao2, Ke Xu2

  • 1Faculty of Information Technology, Beijing University of Technology, Beijing 100124, P.R. China.

Ultramicroscopy
|March 7, 2023
PubMed
Summary

This study introduces an active probe method to significantly increase the scan speed of off-resonance tapping atomic force microscopy (AFM). This advancement enables faster, high-resolution imaging by overcoming the limitations of traditional low-frequency modulation.

Keywords:
Active probeHigh-speed atomic force microscopyOff-resonance tapping

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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.