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Photothermal AFM-IR Depth Sensitivity: An Original Pathway to Tomographic Reconstruction.

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This study introduces a new method for 3D chemical imaging using photothermal atomic force microscopy-infrared (AFM-IR). The technique allows for nanoscale subsurface analysis, revealing material structures with high resolution.

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Area of Science:

  • Materials Science
  • Spectroscopy
  • Nanotechnology

Background:

  • Photothermal atomic force microscopy-infrared (AFM-IR) offers label-free chemical imaging at the nanoscale.
  • Subsurface and 3D tomographic analysis using AFM-IR is an underexplored area.

Purpose of the Study:

  • To establish an empirical relationship for probing depth in AFM-IR.
  • To demonstrate 3D tomographic material analysis using AFM-IR.
  • To reveal subsurface structures with nanometer-scale resolution.

Main Methods:

  • Established an empirical relationship between probing depth and laser repetition rate for AFM-IR.
  • Utilized resonance-enhanced AFM-IR for analyzing thin layers.
  • Applied analytical models for experimental validation.

Main Results:

  • Demonstrated 3D tomographic imaging of polystyrene domains within a poly(methyl methacrylate) matrix.
  • Revealed the size and thickness of subsurface domains with nanometer resolution.
  • Validated experimental findings with analytical models.

Conclusions:

  • The established empirical relationship enables effective 3D AFM-IR analysis.
  • Photothermal AFM-IR can provide high-resolution subsurface and 3D material characterization.
  • This technique advances nanoscale chemical imaging and material analysis.