Atmospheric pressure plasma jet powered by piezoelectric direct discharge

Abstract

The piezoelectric direct discharge sustained using a high-performance piezoelectric transformer (PT) with a voltage transformation ratio of >1,000 was used for the generation of an atmospheric pressure plasma jet (APPJ). The ionization gases used are ambient air and compressed dry air. The APPJ was characterized using capacitive probe measurement, ozone concentration measurement, and activation area determination. The activation experiments were conducted on a highdensity polyethylene. The activation area was visualized using pure formamide test ink (58 mN/m) and captured by a digital camera. The influence of gas flow, PT power, and the distance between the PT and the substrate were investigated. K E Y W O R D S atmospheric pressure plasma jet (APPJ), CeraPlas™ F, piezoelectric direct discharge (PDD), piezoelectric transformer (PT), plasma surface treatment This is an open access article under the terms of the Creative Commons Attribution-NonCommercial-NoDerivs License, which permits use and distribution in any medium, provided the original work is properly cited, the use is non-commercial and no modifications or adaptations are made.

Piezoelectric Direct Discharge: Devices and Applications

“…The voltage from this probe allows for the determination of both the voltage amplitude of the PCPG output induced by piezoelectric oscillation, and the number of the micro-discharges per oscillation period of the PCPG. Figure 4a,b shows the output voltage of the CeraPlas™ F measured by use of the capacitive probe, as described in detail in [11]. Each of these curves can be considered as an overlap of a more-or-less sinusoidal, periodic curve and short non-periodic pulses at the maximum and minimum of the periodic curve, representing the electric reaction of the probe on micro-discharges.…”

“…The default distance and treatment time are 4.5 mm and 10 s, respectively. The method details are described in [11].…”

“…Thanks to its small weight and sizes, the PCPGs are very suitable for application in hand-held APPJs [129][130][131] such as piezobrush ® PZ2 [11,132] or piezobrush ® PZ3 [51].…”

“…The use of PCPG to produce the piezoelectric direct discharge (PDD) [10] is the focus point of this review. The operation power range of 3 to 10 W makes PCPGs especially suitable for implementation in compact desktop instruments or in handheld atmospheric pressure plasma jets (APPJ) [11]. The low temperature of the produced plasma gases, only a few K higher than the ambient temperature, makes the treatment of fruits, seeds, and tissues feasible.…”

“…Concentration and production rate of ozone as a function of gas flow for (a) CDA (results from[11]) and (b) oxygen. The PCPG power is 8.3 W.…”