Miniaturised plasma discharges
The development of miniaturized plasma discharges is strongly requested in analytical science. The plasma discharge has to be as small as possible, but their characteristics should be comparable with big laboratory devices. Our group works in integrating a dielectric barrier discharge (DBD) and a microstructured electrode discharge (MSE) in sensitive detection schemes in order to be able to analyze gaseous, liquid or solid samples.
The pressure range covered by these discharges is from a few millibar up to 1 bar in rare gases, like Argon and Helium, as well as in air. Emission or absorption spectrometry as well as mass spectrometry are implemented as element selective detection techniques. The selective detection of halogenated molecules gives results comparable with those reported using other plasma sources. The detection of organic molecules by a plasma-jet which was developed and applied as soft ionization source shows better ionization efficiencies than those obtained by APCI.
New helium plasmajet-ionisation for LC/MS
The ionisation by dielectric barrier discharge (DBD) microplasma source implemented into a commercial API interface can be regarded as a soft and sensitive ionization technique for LC/MS hyphenation.
Microplasma writing for surface-directed fluidics
Hydrophilic patterns were directly written on a hydrophobic glass substrate with a dielectic barrier discharge (DBD) microplasma jet and used for surface-directed capillary flow operations.
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Dielectric polarisation for electrospray-ionisation
Electrospray (ESI) is the interface of choice to ionise and to transfer substances from a microfluidic separation device into a mass spectrometer (MS).
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