Properties of DBD Plasma Jets Using Powered Electrode With and Without Contact With the Plasma

Abstract

An experimental investigation comparing the properties of plasma jets in dielectric barrier discharge (DBD) configurations using a powered electrode with and without a dielectric barrier, while keeping a second dielectric barrier over the grounded electrode, is reported in this work. For this purpose, two different power sources were used to produce the plasma jets, with one of them producing a pulsed high-voltage (HV) output and the other one producing a damped sine wave HV output, which acts as a pulse-like power source. Measurements of plasma parameters were performed for both configurations using argon and helium as working gases. As a result, if the pulsed power source is used, significant differences were found in discharge power (P dis ), rotational and vibrational temperatures (Tr and Tv, respectively) when switching from one configuration to the other. On the other hand, using the pulse-like HV only the P dis parameter presented significant differences when switching the electrode's configuration. For the pulsed source it has been observed that despite the remarkable increase in P dis when changing from the double barrier configuration to the single barrier one, the values obtained for Tr and Tv also increased, but not in the same proportion as the increase in P dis , which suggests a non-linear dependency between temperatures and discharge power in the plasma jet. As an example for application of plasmas in both configurations, tests in an attempt to remove copper films deposited on alumina substrates were performed and, as a result, there was significant material removal only when the powered electrode was in contact with the plasma. As a general conclusion, if higher power is really required for applications that do not involve in vivo targets it is better to use this configuration.

Impact of Micropulse and Radio Frequency Coupling in an Atmospheric Pressure Plasma Jet on the Synthesis of Gold Nanoparticles

“…In Figure 4 and the upper part of Figure 3, the OH (A-X) transition and the N2 (C-B) bands for argon and helium at 30 W RF are shown, while in Figure 4, the results of the rotational temperature (Trot) derived by the OH and of the vibrational temperature (Tvib) derived by the N2 SPS as a function of the RF power are presented. Both discharges exhibit an increase in Trot as a function of RF power levels, although for helium gas, this variation remains confined within a range of 100 K. Furthermore, the Trot for helium consistently remains below 500 K, aligning with expectations and remaining approximately 100-200 K lower compared to argon [25]. This lower temperature is also highlighted by the absence of the NH emission at 336 nm [26].…”

Photoelectrocatalytic activity of silicon nanowires decorated with electroless copper nanoparticles and graphene oxide using a plasma jet for removal of methyl orange under visible light

“…42 The plasma consists of reactive oxygen and nitrogen species, charged particles, molecules, free radicals, ions, atoms, and electrons that alter the hydrophobicity or hydrophilicity, roughness, or surface of the samples. 41,43–45…”

Processing laser ablated plasmonic nanoparticle aerosols with nonthermal dielectric barrier discharge jets of argon and helium and plasma induced effects

“…The scientific and technological concern in these plasmas arose more than 70 years back, and since then DBDs have been recognised a great asset to humans for innovative and industrially feasible cutting-edge technologies. For the fraternity of scientists and engineers, DBDs are offering several potential solutions to everyday problems with the freedom of working in an open and flexible workplace 1 – 5 . It is now recognised a platform technology, replacing and/or integrating with the production stages in the growing medicine and healthcare, surface activation and modification, biomedical and surgical, textiles, sterilized food processing and packaging, smart agriculture, clean energy, and environmental remediation, ground-breaking materials, microfabrication, and many more 2 – 23 .…”