Atmospheric microplasma jet: spectroscopic database development and analytical results.

Area of Science:

• Analytical Chemistry
• Plasma Physics
• Spectroscopy

Background:

• Conventional gas detection methods often lack portability, specificity, or sensitivity.
• There is a need for real-time, in-situ analytical techniques capable of identifying diverse chemical species.

Purpose of the Study:

• To develop and characterize a portable dielectric-barrier-discharge (DBD) based detector for chemical analysis.
• To establish a spectral database for chemical identification and quantification.
• To demonstrate the device's capability in differentiating various classes of organic compounds.

Main Methods:

• Development of a portable dielectric-barrier-discharge plasma source operating at atmospheric pressure.
• Electrical characterization of the plasma and calculation of energy coupling.
• Acquisition and analysis of atomic and diatomic emission spectra from various analytes.
• Creation of a chemical signature database based on optical emission intensity.

Main Results:

• The DBD sniffer provides both molecular and elemental information for gases and aerosols.
• Detection limits down to parts per billion (ppb) levels were achieved for certain compounds (e.g., decane, nitrobenzene).
• Successful differentiation of organic compound classes including alkanes, aromatics, and oxygenates was demonstrated.

Conclusions:

• The developed DBD sniffer is a highly specific and sensitive portable detector.
• The spectral signature database enables reliable chemical classification and concentration determination.
• This technology offers a promising tool for diverse applications requiring rapid chemical analysis.