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Related Experiment Videos

Development of a High-Density Microplasma Emission Source for a Micro Total Analysis System.

Ken Kakegawa1, Ryoto Harigane, Mari Aida

  • 1Laboratory for Future Interdisciplinary Research of Science and Technology, Tokyo Institute of Technology.

Analytical Sciences : the International Journal of the Japan Society for Analytical Chemistry
|April 11, 2017
PubMed
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A novel microplasma device enables highly sensitive, onsite analysis of trace gases like chlorine, bromine, and iodine. This micro-total analysis system (μ-TAS) offers excellent linearity and low detection limits for environmental monitoring.

Area of Science:

  • Analytical Chemistry
  • Plasma Physics
  • Microfluidics

Background:

  • Developing sensitive, portable analytical systems for onsite sample analysis is crucial.
  • Micro-total analysis systems (μ-TAS) offer miniaturization potential for complex analytical tasks.
  • Stable atmospheric pressure plasma sources are needed for compact analytical devices.

Purpose of the Study:

  • To develop a highly sensitive and onsite analysis device for small sample volumes.
  • To create a microplasma-based micro-total analysis system (μ-TAS) for gas analysis.
  • To investigate the performance of a dielectric barrier discharge (DBD) plasma source in a microchip.

Main Methods:

  • A microchip-based dielectric barrier discharge (DBD) was utilized as the atmospheric pressure plasma source.

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  • Helium plasma was generated within a microchannel for system miniaturization.
  • Emissions from gaseous chlorine (Cl), bromine (Br), and iodine (I) were analyzed.

    • Main Results:

    • The developed DBD microplasma source demonstrated stable plasma generation at atmospheric pressure.
    • Detection limits for gaseous Cl, Br, and I were found to be 0.22, 0.18, and 0.14 ppm, respectively.
    • Excellent linearity was observed for Cl, Br, and I with correlation coefficients of 0.975, 0.955, and 0.986, respectively.

    Conclusions:

    • The microplasma-based μ-TAS device is suitable for highly sensitive and onsite analysis of trace halogens.
    • The DBD plasma source offers long-term operation with suppressed electrode damage and temperature rise.
    • The developed system shows promise for miniaturized, portable analytical applications.