| Abstract: | AbstractThis study investigates the influence of two types of target, skin tissue and cell culture medium,with different permittivities on a kHz helium atmospheric pressure plasma jet (APPJ) during itsapplication for wound healing. The basic optical–electrical characteristics, the initiation andpropagation and the emission spectra of the He APPJ under different working conditions areexplored. The experimental results show that, compared with a jet freely expanding in air, thediameter and intensity of the plasma plume outside the nozzle increase when it interacts with thepigskin and cell culture medium targets, and the mean velocity of the plasma bullet from the tubenozzle to a distance of 15 mm is also significantly increased. There are also multiple increases inthe relative intensity of OH (A2 Σ → X2 Π) and O (3p5 S–3s5 S) at a position 15 mm away fromnozzle when the He APPJ interacts with cell culture medium compared with the air and pigskintargets. Taking the surface charging of the low permittivity material capacitance and thestrengthened electric field intensity into account, they make the various characteristics of HeAPPJ interacting with two different targets together. |
