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Photoacoustic Depth Profiling of Polymer Laminates by Step-Scan Fourier Transform Infrared Spectroscopy

Publication ,  Journal Article
Dittmar, RM; Chao, JL; Palmer, RA
Published in: Applied Spectroscopy
August 1991

The use of step-scan Fourier transform infrared (FT-IR) spectroscopy with photoacoustic (PA) detection for depth profiling studies of polymer laminates is demonstrated. Step-scan FT-IR simplifies the extraction of depth profile information due to the single modulation frequency that can be applied over the entire spectral range. Because a single modulation frequency is generally used in step-scan FT-IR, the thermal diffusion length, μ, is constant for all wavelengths in a single scan. In addition, lock-in detection allows for easy extraction of the signal phase. Two methods of depth profiling are discussed and illustrated. The first is the conventional method of varying the probe depth by changing the modulation frequency. The other method depends on the direct use of the signal phase. The phase analysis technique is particularly useful for cleanly separating the signal due to a thin (<5 μm) surface layer from that of the bulk or substrate.

Duke Scholars

Published In

Applied Spectroscopy

DOI

EISSN

1943-3530

ISSN

0003-7028

Publication Date

August 1991

Volume

45

Issue

7

Start / End Page

1104 / 1110

Publisher

SAGE Publications

Related Subject Headings

  • Analytical Chemistry
  • 0913 Mechanical Engineering
  • 0306 Physical Chemistry (incl. Structural)
  • 0301 Analytical Chemistry
 

Citation

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ICMJE
MLA
NLM
Dittmar, R. M., Chao, J. L., & Palmer, R. A. (1991). Photoacoustic Depth Profiling of Polymer Laminates by Step-Scan Fourier Transform Infrared Spectroscopy. Applied Spectroscopy, 45(7), 1104–1110. https://doi.org/10.1366/0003702914336138
Dittmar, Rebecca M., James L. Chao, and Richard A. Palmer. “Photoacoustic Depth Profiling of Polymer Laminates by Step-Scan Fourier Transform Infrared Spectroscopy.” Applied Spectroscopy 45, no. 7 (August 1991): 1104–10. https://doi.org/10.1366/0003702914336138.
Dittmar RM, Chao JL, Palmer RA. Photoacoustic Depth Profiling of Polymer Laminates by Step-Scan Fourier Transform Infrared Spectroscopy. Applied Spectroscopy. 1991 Aug;45(7):1104–10.
Dittmar, Rebecca M., et al. “Photoacoustic Depth Profiling of Polymer Laminates by Step-Scan Fourier Transform Infrared Spectroscopy.” Applied Spectroscopy, vol. 45, no. 7, SAGE Publications, Aug. 1991, pp. 1104–10. Crossref, doi:10.1366/0003702914336138.
Dittmar RM, Chao JL, Palmer RA. Photoacoustic Depth Profiling of Polymer Laminates by Step-Scan Fourier Transform Infrared Spectroscopy. Applied Spectroscopy. SAGE Publications; 1991 Aug;45(7):1104–1110.
Journal cover image

Published In

Applied Spectroscopy

DOI

EISSN

1943-3530

ISSN

0003-7028

Publication Date

August 1991

Volume

45

Issue

7

Start / End Page

1104 / 1110

Publisher

SAGE Publications

Related Subject Headings

  • Analytical Chemistry
  • 0913 Mechanical Engineering
  • 0306 Physical Chemistry (incl. Structural)
  • 0301 Analytical Chemistry