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Updated: May 9, 2026

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High frequency alternating current chip nano calorimeter with laser heating.

E Shoifet1, Y Z Chua, H Huth

  • 1Institute of Physics, University of Rostock, Wismarsche Str. 43-45, 18051 Rostock, Germany.

The Review of Scientific Instruments
|August 2, 2013
PubMed
Summary

AC-calorimetry with thin film chip sensors measures frequency-dependent heat capacity up to 1 MHz. This technique, utilizing micro-scale heating and cooling, precisely captures the dynamic glass transition in polymers.

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Area of Science:

  • Materials Science
  • Physical Chemistry
  • Polymer Science

Background:

  • Traditional heat capacity spectroscopy using the 3ω-technique is limited to 100 kHz.
  • Measuring frequency-dependent heat capacity in thin films requires advanced calorimetric methods.
  • Understanding polymer dynamic glass transitions is crucial for material property prediction.

Purpose of the Study:

  • To develop and demonstrate a novel AC-calorimetry technique for high-frequency heat capacity measurements.
  • To extend frequency-dependent heat capacity measurements into the megahertz range for thin films.
  • To investigate the dynamic glass transition of poly(methyl methacrylate) over an unprecedented frequency range.

Main Methods:

  • Utilized a thin film chip sensor with micro-scale thermocouple (3 × 6 μm²) for high cooling rates.

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  • Employed a modulated laser beam as a heat source for precise thermal control.
  • Measured frequency-dependent complex heat capacity of thin polymer films (< 1 μm).

    • Main Results:

    • Achieved frequency-dependent heat capacity measurements up to 1 MHz using AC-calorimetry.
    • Demonstrated that thin films (< thermal wave length) yield heat capacity primarily.
    • Observed a significant shift of ~120 K in the dynamic glass transition of poly(methyl methacrylate) across 10⁻³ Hz to 10⁶ Hz.

    Conclusions:

    • The developed AC-calorimetry technique enables high-frequency heat capacity measurements in the thin film limit.
    • This method provides a more direct measurement of heat capacity compared to thermal effusivity.
    • The study significantly advances the understanding of polymer dynamics and glass transitions across a broad frequency spectrum.