2016/05/02 by Corinne Duluard, Thierry Dufour, Duluard, Corinne Y. +5
Medicine · #FOS: Physical sciences #Plasma Applications and Diagnostics #Plasma Physics (physics.plasm-ph)
paper · pdf · doi:10.48550/arxiv.1605.08058
openalex publication_date 2016/05/02 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/28
In the context of polymer surface treatment, the afterglow of an atmospheric pressure Ar/O2 radiofrequency plasma is characterized by optical emission spectroscopy, laser induced fluorescence and mass spectrometry. The influence of the O2 gas flow rate and the source power on the plasma properties (gas temperature, Ar excitation temperature, relative concentrations of O atoms and OH radicals) are evaluated. We show that for plasma torch-to-substrate distances lower than 6 mm, the afterglow creates a protective atmosphere, thus the plasma gas composition interacting with the substrate is well controlled. For higher distances, the influence of ambient air can no longer be neglected and gradients in Ar, O2 and N2 concentrations are measured as a function of axial and vertical position.