Downstream Characterization of an Atmospheric Pressure Pulsed Arc Jet

Hsu, Yao-Wen; Yang, Yao-Jhen; Wu, Cheng‐Yi; Hsu, Cheng–Che

doi:10.1007/s11090-010-9224-9

Cited by 35 publications

(27 citation statements)

References 30 publications

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“…Special attention is paid to avoid possible perturbations on the GIWs electrical characteristics, by placing it as it is shown in the lower frame of Figure 2. This method is the same with the one used in [41] and it allows reliable control of the thermal processes evolved during the reactor operation. The overall error on the measured temperature (i.e., error of For the measurement of the dielectric tube temperature, a thermocouple (National Instruments 9211, Nanterre, France) is mounted near to its orifice (see Figure 1), allowing for real time monitoring in a personal computer.…”

Section: Methodsmentioning

confidence: 99%

Electrical, Thermal and Optical Parametric Study of Guided Ionization Waves Produced with a Compact μs-Pulsed DBD-Based Reactor

Doanh

Held

Clément

2017

Plasma

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Atmospheric pressure guided ionization waves (GIWs) that are driven by ns/µs-pulsed high voltages, are promising tools in the biomedical field allowing for the effective production of reactive species and metastables without thermal damages of the specimens that are exposed. In most cases, plasma is produced in noble gases using dielectric barrier discharge (DBD) devices of more-or-less sophisticated geometries. In this study, a compact low-cost DBD reactor of very simple geometry is presented. It is fed with pure helium and driven by positive µs-pulsed high voltage (amplitude: 4.5-8 kV, pulse width: 1-10 µs) of audio frequencies (5-20 kHz), while it operates consistently for long time periods in a wide range of conditions. The produced plasma exhibits propagation lengths up to 4 cm and rich chemical reactivity is established outside the reactor, depending on the device's experimental parameters. Besides, the dielectric tube's temperature during plasma operation is an important factor, which is linked to the plasma characteristics. This temperature and its variations are thoroughly investigated herein, along with GIWs electrical features versus the electrical parameters of the pulsed power supply. Accordingly, it is demonstrated that not all of the operational windows are adequate for thermal-free operation and suitable operating conditions of this system are proposed for diverse applications, such as biomedical (low gas temperature is a prerequisite) and surface treatments of solid materials (low temperatures are not required).

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Section: Methodsmentioning

confidence: 99%

Electrical, Thermal and Optical Parametric Study of Guided Ionization Waves Produced with a Compact μs-Pulsed DBD-Based Reactor

Doanh

Held

Clément

2017

Plasma

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“…This highly energetic plasma species may provide extra energy for the removal of the organic compounds. 21,22 Trace level of oxygen from the ambient air may also help the oxidation of the organic binders.…”

Section: Resultsmentioning

confidence: 99%

Ultrafast Atmospheric-Pressure-Plasma-Jet Sintering of Nanoporous TiO₂-SnO₂Composites with Features Defined by Screen-Printing

Wang

Cheng

Chen

2015

ECS J. Solid State Sci. Technol.

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We investigated atmospheric-pressure-plasma-jet (APPJ)-sintered nanoporous TiO 2 and TiO 2 -SnO 2 composites with patterns defined by the screen-printing technique. The pastes used for screen-printing were made of oxide nanoparticles and organic binders. After using screen-printing to define the features, APPJ was then used to rapidly sinter the screen-printed pastes. APPJ sintering for 30 s can efficiently remove the organic compounds and sinter the nanoparticles, with transmittance haze values comparable to those of nanoporous oxides prepared by conventional furnace calcination. Screen-printing is a mature scalable low-cost deposition process that has been extensively used for the fabrication of various types of devices. [1][2][3][4][5][6][7][8] In industry, this technique is commonly used in roll-to-roll processes in which printing is performed when the web is stationary. Because alignment can be more easily achieved in this technique, it is customarily used in printing the second and follow-up layers. 9,10Recently, screen-printing has attracted renewed interest owing to the search for low-cost fabrication processes for flexible/stretchable supercapacitors, 3,4 We have applied the screen-printing technique to produce ceramictype metal oxides. Screen-printing administers the pastes containing the desired oxide nanoparticles with organic solvents or binders to maintain the required viscosity. The removal of these organic compounds usually requires calcination or annealing processes that are time-consuming and require a high thermal budget. In our previous study, we have developed a rapid atmospheric-pressure-plasma-jet (APPJ) sintering process for nanoporous TiO 2 with a sintering time as short as 1 min. The sintering time can be further reduced to 30 s by introducing air-quenching to increase the oxidization ability. [21][22][23] In contrast, furnace calcination would require ∼15 min excluding the temperature ramping and cooling times. This ultrafast sintering process was made possible by the synergistic effect of highly reactive/active N 2 plasmas and heat generated in APPJs. 21,22 Most recently, we further used this sequential screen-printing and APPJ-sintering process for the fabrication of reduced graphene oxide (rGO) counter electrodes of DSSCs. The processing time was only 11 s owing to the vigorous reaction between the N 2 APPJ and the carbon-based materials; in comparison, conventional furnace calcination would take 15 min at 400• C. The estimated energy consumption per unit processing area is less than one-third that of the conventional furnace calcination process. 19In this paper, we describe the sequential screen-printing and APPJsintering processes, as well as the preparation procedure of the oxide nanoparticle pastes in detail. Nanoporous TiO 2 and TiO 2 -SnO 2 composites are sintered by APPJs and characterized. The synthesized nanoporous oxides are implemented as the photoanodes of DSSCs for functionality testing.z E-mail: jchen@ntu.edu.tw; iccheng@ntu.edu.tw ExperimentalDetails of APPJ operatio...

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“…The APPJ system uses a pulse power source detailed description of the APPJ has been described in [23]- [25], and the experiment apparatus is shown in Fig. 1.…”

Section: Methodsmentioning

confidence: 99%

Deposition of ZnO Thin Films by an Atmospheric Pressure Plasma Jet-Assisted Process: The Selection of Precursors

Hsu

Lien

et al. 2015

IEEE Trans. Plasma Sci.

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The deposition ZnO thin films using an atmospheric pressure plasmas jet (APPJ)-assisted process using different precursors is presented. In this process, nebulized salt solutions droplets or precursor vapor were injected into the downstream of the APPJ to perform deposition of ZnO thin films. Zinc chloride (ZC)-, zinc acetate (ZA)-, and zinc nitrate (ZN)-containing solution and zinc acetylacetonate (ZAA) were precursors tested. For all precursors tested, formation of ZnO was observed based on X-ray diffraction analysis. ZC, however, was the only precursor that yields smooth films, which yields average transmittance in the visible wavelength range well >70%. When ZN, ZA, and ZAA were used as the precursors, rather rough films were obtained due to the fact that these precursors decomposed and formed ZnO readily upon heating. A high rate of volume nucleation, therefore, occurs in the gas phase. The above observation serves as the guideline for the selection of precursors for APPJ-assisted thin-film deposition processes.Index Terms-Atmospheric pressure plasmas jet (APPJ), precursor, thin films, ZnO.

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Downstream Characterization of an Atmospheric Pressure Pulsed Arc Jet

Cited by 35 publications

References 30 publications

Electrical, Thermal and Optical Parametric Study of Guided Ionization Waves Produced with a Compact μs-Pulsed DBD-Based Reactor

Electrical, Thermal and Optical Parametric Study of Guided Ionization Waves Produced with a Compact μs-Pulsed DBD-Based Reactor

Ultrafast Atmospheric-Pressure-Plasma-Jet Sintering of Nanoporous TiO₂-SnO₂Composites with Features Defined by Screen-Printing

Deposition of ZnO Thin Films by an Atmospheric Pressure Plasma Jet-Assisted Process: The Selection of Precursors

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Downstream Characterization of an Atmospheric Pressure Pulsed Arc Jet

Cited by 35 publications

References 30 publications

Electrical, Thermal and Optical Parametric Study of Guided Ionization Waves Produced with a Compact μs-Pulsed DBD-Based Reactor

Electrical, Thermal and Optical Parametric Study of Guided Ionization Waves Produced with a Compact μs-Pulsed DBD-Based Reactor

Ultrafast Atmospheric-Pressure-Plasma-Jet Sintering of Nanoporous TiO2-SnO2Composites with Features Defined by Screen-Printing

Deposition of ZnO Thin Films by an Atmospheric Pressure Plasma Jet-Assisted Process: The Selection of Precursors

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Ultrafast Atmospheric-Pressure-Plasma-Jet Sintering of Nanoporous TiO₂-SnO₂Composites with Features Defined by Screen-Printing