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Contrasting characteristics of sub-microsecond pulsed atmospheric air and atmospheric pressure helium–oxygen glow discharges

Contrasting characteristics of sub-microsecond pulsed atmospheric air and atmospheric pressure helium–oxygen glow discharges,10.1088/0022-3727/43/3/03

Contrasting characteristics of sub-microsecond pulsed atmospheric air and atmospheric pressure helium–oxygen glow discharges   (Citations: 6)
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Glow discharges in air are often considered to be the ultimate low-temperature atmospheric pressure plasmas for numerous chamber-free applications. This is due to the ubiquitous presence of air and the perceived abundance of reactive oxygen and nitrogen species in air plasmas. In this paper, sub-microsecond pulsed atmospheric air plasmas are shown to produce a low concentration of excited oxygen atoms but an abundance of excited nitrogen species, UV photons and ozone molecules. This contrasts sharply with the efficient production of excited oxygen atoms in comparable helium–oxygen discharges. Relevant reaction chemistry analysed with a global model suggests that collisional excitation of O2 by helium metastables is significantly more efficient than electron dissociative excitation of O2, electron excitation of O and ion–ion recombination. These results suggest different practical uses of the two oxygen-containing atmospheric discharges, with air plasmas being well suited for nitrogen and UV based chemistry and He–O2 plasmas for excited atomic oxygen based chemistry.
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    • ...Therefore, a comparison of high-voltage ac and nanosecondpulsed DBDs is required for the potential applications [1]‐[3]...

    Hui Jianget al. Comparison of AC and Nanosecond-Pulsed DBDs in Atmospheric Air

    • ...Some these include electrical characteristics, the transition between filamentary and homogeneous discharge modes, comparison of high-voltage ac and pulsed discharge and so on [18-33]...
    • ...More frequently results seem to indicate that two current pulses, corresponding to two consecutive discharges are generated per voltage pulse [2, 10, 12-18, 21-25, 27, 29-32]...
    • ...Compared with the peak value of the discharge in [21- 25], the discharge current is still relatively greater considering the discharge occurs in atmospheric air...

    Tao Shaoet al. Excitation of atmospheric pressure uniform dielectric barrier discharg...

    • ...In addition, the characteristics of two oxygen-containing submicrosecond pulsed discharge in atmospheric pressure were compared by Kong et al., and the results showed that the He-O2 discharge took more advantage over the air discharge on the production of excited reactive oxygen species [26]...
    • ...In addition, the percent of N1s increases after FDBD and HDBD treatments, which may be due to the fact that pulsed atmospheric air plasma can produce an abundance of excited nitrogen species [26]...
    • ...Walsh et al. stated that the air discharge plasma employed 14 species particles and contributed several hundreds chemical reactions in the treatment, and the exited species, cation, and anion of the oxygen-containing particles are mainly responsible for the good surface treatment [26]...
    • ...Because the discharge current, instantaneous power, energy deposition, charge transfer, electron density, and electron temperature in unipolar nanosecond-pulsed DBD are larger than those in ac DBD [18]‐[21] and [26], [27], therefore, it can produce much powerful plasma and active particles for surface treatment...
    • ...It may be attributed to the shorter rise time and pulsewidth of the applied voltage, which induces high E/N and large peak discharge current for desirable active plasma chemistry, and the nanosecond-pulsed excitation would lead to more abundant reactive species and emission [26], [27]...

    Cheng Zhanget al. Surface Treatment of Polyethylene Terephthalate Films Using DBD Excite...

    • ...Currently, the applications are involved with ozone formation, exhaust gas treatment, ultraviolet or vacuum ultraviolet radiation generation, surface modification, plasma jet production, medical sterilization and so on [2-11]...
    • ...Most related results have reported that, for unipolar pulsedexcitation, two current pulses corresponding to two consecutive discharges are generated per voltage pulse [3-7]...

    Tao Shaoet al. Nanosecond-pulse dielectric barrier discharge using magnetic compressi...

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