Spatially resolved measurements of the physical plasma parameters and the chemical modifications in a twin surface dielectric barrier discharge for gas flow purification

Abstract

A twin surface dielectric barrier discharge consisting of an aluminium oxide plate with grid‐structured copper traces on both sides is presented. Due to the size of the electrode configuration spatially resolved optical emission spectroscopy for characterisation of the discharge is performed on two different length scales in order to show its homogeneous behaviour. A broadband echelle spectrometer is employed for a comparison of the plasma parameters at different sites along the copper traces with a spatial resolution on a scale of millimetres. In addition, an ICCD camera with bandpass filters yields homogeneity of the plasma parameters on a scale of micrometres at a given node of the grid‐structured copper traces. The discharge is shown to be homogeneous all along the electrode. However, due to the changing composition of the gas stream, it cannot be concluded that the gas phase chemistry follows the same trend. Therefore, FTIR spectroscopy of cysteine is used to monitor the spatial dependence of the gas phase chemistry, showing a transition from purely oxygen‐related modifications at the front of the electrode to a mixture of oxygen‐related and nitrogen‐related modifications at the rear.

Fundamental Properties and Applications of Dielectric Barrier Discharges in Plasma‐Catalytic Processes at Atmospheric Pressure

“…4g a symmetric double-sided setup is illustrated allowing to treat the gas on both sides of the elec-trode. Offerhaus et al [53] presented a twin-surface DBD designed for the application in gas streams based on two conducting metal grids on both sides of an Al 2 O 3 plate. The ignition of the plasma was shown to be homogeneous along the electrode for all tested conditions on both sides of the electrode configuration.…”

“…Conventional purification methods based on noble metal catalyst may reach their limits due to the complex gas mixtures and the variety of impurities, like sulfur compounds. The authors of this review utilize the twin-surface DBD presented by Offerhaus et al [53] for the plasma-catalytic removal of oxygen traces from coke oven gases and hydrogen-rich gas mixtures over Pt-based catalysts. Photographs of the reactor and the ignited plasma are shown in Fig.…”

Characterisation of volume and surface dielectric barrier discharges in N2–O2 mixtures using optical emission spectroscopy

“…F I G U R E 1 Schematics of the experimental setups for the characterisation of the dielectric barrier discharges (adapted from Offerhaus et al [17] and Kogelheide et al [18] ) Xantrex). When the transistor switches, the capacitor discharges into the ignition transformer, which generates the HV applied to the driven electrode.…”

“…The SDBD is made of an aluminium oxide plate (190 mm × 88 mm × 0.635 mm) functioning as a dielectric barrier with grid-structured copper traces placed on each side of the dielectric. The procedure of coating the electrodes by the dielectric material is described in more detail in Offerhaus et al [17] 2.2 | Diagnostics 2. . In the present study, a trigger frequency of 1000 Hz is chosen.…”

Antimicrobial effects of microwave‐induced plasma torch (MiniMIP) treatment on Candida albicans biofilms

“…Currently, the road in NTP research and development points to an increasing importance for application‐oriented plasma sources because of their differences in design, performance and application, depending on the respective task. The number of different NTP sources including plasma needles (Stoffels, Flikweert et al , ; Bora, Aguilera et al , ; Mohammed and Abas, ), plasma jets (Fricke, Koban et al , ; Xu, Shen et al , ; Xu, Shen et al , ), dielectric barrier discharge (DBD; Pietsch, , de Souza, Neto et al , , Offerhaus, Lackmann et al , ) or microwave‐induced plasmas (Jovicevic, Ivkovic et al , ; Baeva, Bösel et al , ) is constantly growing.…”