Intense and Energetic Atmospheric Pressure Plasma Jet Arrays

Abstract

Intense and energetic atmospheric plasma emissions were achieved by direct jet‐to‐jet coupling using honeycomb‐structured quartz tube arrays. Two plasma modes were found to exist in the same plasma array structure under a change of gas flow conditions: an intense plasma mode and the well‐collimated plasma mode. In order to describe the direct jet‐to‐jet coupling by electrical coupling of charged particles in the plasma, the optical emission of the plasma array was compared with that of a single tube plasma jet. Under identical electrical driving and gas conditions, the optical intensity from the intense plasma jet was approximately four times larger in the coupled array than in the single plasma jet structure. Additionally, the electron energy in the intense plasma was larger than that of the well‐collimated plasma jets in the same device. This intense and energetic plasma jet, arising through direct jet‐to‐jet coupling, may provide novel applications requiring strong discharge processes using simplified structures and accompanying instrumentation when compared with the present vacuum plasma systems.

Intense plasma emission induced by jet-to-jet coupling in atmospheric pressure plasma arrays

“…As a result, the optical intensity and the electron energy of the plasma were increased by electrical coupling of charged particles at atmospheric pressure. 8,9 In order to further increase the emission of plasma array devices, which is a consideration of practical consequence, it is important to induce stronger jet-to-jet coupling among adjacent plasma jets. To do so, the number of outer tubes needs to be increased so that a greater number of charged particles are introduced into the central plasma plume.…”

“…Recent research suggests this deficiency is overcome through the use of two or more plasma jets, in which a jet-to-jet coupling occurs between adjacent atmospheric pressure plasma jets (APPJs). [6][7][8][9][10] While operating in the honeycomb-shaped plasma array configuration, [8][9][10] the plasma jet generated in the central tube formed its own plasma plume in the ambient air, and the neighboring plasma jets generated in the outer tubes provided charged particles to the central plasma plume. Thus, the central plasma plume was reinforced by an abundance of charged particles from the outer plasma jets.…”

“…The atmospheric plasma system employed in this work is similar to that described previously. [4][5][6][7][8] The gas flow was split in two so that the gas flow rates in the central tube and the outer tubes could be independently controlled. High purity helium (99.997%) was used as a discharge gas.…”

A Study on Discharge Characteristics by Using MF and RF Power in Remote Dielectric Barrier Discharge

“…Moreover, they attempted to remove bacteria and germs using atmospheric pressure plasma of arc jet type or dis- * corresponding author; e-mail: djkim86@naver.com charge formed by a needle [10][11][12]. Kim et al proposed the surface treatment of indium tin oxide (ITO) glasses by means of a plasma jet array [13].…”

Characteristics in the jet region of helium radio-frequency atmospheric-pressure glow discharge with array generators

“…7 Moreover, to improve the treating efficiency of the material in practice, the RF APGD plasma generators are often arranged in array to enlarge the treating area of the plasma jet. [8][9][10][11] Nowadays, the behaviors of plasma jet with array generator configuration are attracting much more attention of the researchers for better use of such plasma jets, with chemical kinetic processes fully considered. Although the jet array is capable of simultaneous firing of all component jets, it is still a challenge to form a large area of plasma jet with good uniformity of active species and less temperature fluctuation on the downstream substrate due to jet-to-jet coupling effects.…”