An atmospheric‐pressure microplasma array produced by using graphite coating electrodes

Abstract

In this work, a novel non-thermal atmospheric-pressure microplasma array (APMPA) has been characterized. The APMPA employs 16 parallel capillaries with an inner diameter of 200 µm and arranged in a square configuration. Our measurements show that the stable plasma plumes can be generated by the APMPA and then spread along the dielectric surface. Both the power in the plasma source region and the one transferred onto the dielectric surface are calculated by plotting Lissajous figures. The power strongly depends on the applied voltage, frequency, and the distance between the nozzles and the dielectric surface. In addition, the temperature of N 2 molecules in APMPA plasmas is calculated by using optical emission spectroscopy. The temporally resolved images of the APMPA plasmas show that the total emission intensities for the case of positive half-period is much higher than that of negative half-period. In order to describe the performance of the APMPA, the optical emission of the APMPA is compared with a single tube plasma jet with the same configuration and cross section area, and the result illustrates the APMPA can provide a higher density plasma and larger treatment area which may have a beneficial effect on various applications. K E Y W O R D Satmospheric-pressure plasma, biomedical applications, electrode structure, microplasma, plasma array

Jet‐to‐jet interactions in atmospheric‐pressure plasma jet arrays for surface processing

“…Plasma arrays containing multiple individual jets close to each other are used to increase the treatment area. For instance, one‐dimensional (1D) and two‐dimensional (2D) jet arrays have been developed and a few of them have been applied in materials processing and plasma biomedicine with satisfactory results …”

“…Plasma arrays containing multiple individual jets close to each other are used to increase the treatment area. For instance, one-dimensional (1D) and two-dimensional (2D) jet arrays have been developed [10][11][12][13][14][15][16] and a few of them have been applied in materials processing and plasma biomedicine with satisfactory results. [15][16][17] In a single plasma jet, the effects of fluid field, electrical field, and device structure on the electrical characteristics, propagation dynamics, and plume length have been widely investigated with optical and electrical diagnosis, ICCD imaging, and Schlieren photography.…”

Guided ionization waves: The physics of repeatability

“…In the meantime, studies on the dynamics of N-APPJs, i.e., the guided ionization waves, or the commonly called "plasma bullet," have found that the guided ionization wave propagates at a speed of 10 3 -10 6 m/s, which is similar to the propagation speed of positive streamers. [11][12][13][14][15][16][17][18][19][20] However, there are some distinct differences between guided ionization waves and positive streamers. First, positive steamer discharges normally have lots of branches as shown in Fig.…”

Atmospheric pressure non-equilibrium plasma jet technology: general features, specificities and applications in surface processing of materials

“…The utilization of one-dimensional (1D) [66,111,186,187] or two-dimensional (2D) [25,[188][189][190][191][192] arrays of plasma jets has been also proposed to enlarge the treated area. Very often this strategy is reported in combination with source/sample holder displacement to improve the uniformity of the process and further enlarge the treated area [187].…”