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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.
The AFM Probe
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Updated: Aug 16, 2025

Atomic Force Microscopy of Red-Light Photoreceptors Using PeakForce Quantitative Nanomechanical Property Mapping
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Lock-in amplifier based peak force infrared microscopy.

Andrea Dorsa1, Qing Xie1, Martin Wagner2

  • 1Department of Chemistry, Lehigh University, 6 E Packer Ave., Bethlehem, PA, 18015, USA. xgx214@lehigh.edu.

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|December 20, 2022
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Summary
This summary is machine-generated.

A new lock-in amplifier method simplifies peak force infrared (PFIR) microscopy, enabling label-free chemical imaging. This advancement lowers the barrier for using this powerful nanoscale infrared (nano-IR) technique.

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Area of Science:

  • Spectroscopy
  • Nanotechnology
  • Materials Science

Background:

  • Nanoscale infrared (nano-IR) microscopy offers high-resolution, label-free chemical imaging below the diffraction limit.
  • Peak force infrared (PFIR) microscopy is an emerging nano-IR technique providing multimodal chemical and mechanical characterization.
  • Current PFIR microscopy requires specialized hardware and software, limiting its accessibility.

Purpose of the Study:

  • To develop an accessible PFIR microscopy method using commercially available equipment.
  • To reduce the implementation barrier for PFIR microscopy.
  • To demonstrate the utility of a simplified PFIR approach for diverse samples.

Main Methods:

  • Assembly of a PFIR microscope using a lock-in amplifier and generic, commercially available components.
  • Non-destructive multimodal chemical and mechanical characterization.
  • Operation without specialized hardware or software programming.

Main Results:

  • Demonstrated successful PFIR microscopy with a lock-in amplifier-based system.
  • Applied the method to heterogeneous soft matter, including polymer blends and blocks.
  • Successfully imaged biological cells, such as E. coli.

Conclusions:

  • A lock-in amplifier-based PFIR microscopy approach significantly lowers the entry barrier for nano-IR techniques.
  • This simplified PFIR method makes advanced chemical and mechanical characterization more accessible to new users.
  • The developed system offers a competitive and user-friendly alternative for nanoscale chemical imaging.