Speaker
Description
Surface Dielectric Barrier Discharge characterization
based on mass spectrometry diagnostic techniques
R. Barni, D. Pal, C. Riccardi
Dipartimento di Fisica G. Occhialini, Università degli Studi di Milano-Bicocca,
Piazza della Scienza 3, I-20126 Milano, Italy
Non-thermal plasmas in atmospheric air have been proposed as a tool aimed to various applications, including air purification, food packaging, textile finishing and new materials development, owing to its capacity to generate highly reactive species under ambient conditions. Surface Dielectric Barrier Discharges (SDBD) are particularly promising because the plasma state is almost two-dimensional and confined to region facing the dielectric surface, with only indirect interactions with the surrounding gas-phase or with the to be exposed surfaces aimed for functionalization. One key aspect is the generation of reactive oxygen and nitrogen species (RONS), which play a fundamental role in oxidative processes. The relative concentrations of these species determine the overall oxidative potential of the plasma and its effectiveness in biological and chemical applications. Therefore, the accurate identification and quantification of these species are essential for any optimization strategy to enhance the efficiency of the plasma. Mass spectroscopy could be used to gain insight into such gas-phase composition. Our mass-spectrometer (HPR60 by Hiden) in particular, with its ability to change the electron energy in an extended range (namely 4-150 eV), their intensity (about four decades between 0.2 to 2000 uA) and the electrical optics (so that it is able to collect native positive and negative ions from the discharge region), could aim to a a comprehensive characterization of plasma gas-phase. Here we presents the results of an experimental campaign aimed to this.
[1] “Mass spectroscopy of oxygen plasmas with energetic ions”, R. Barni, M. Daghetta, C. Piferi, C. Riccardi, AIP Advances 13, 065207.1-5 (2023).