Spatially resolved atomic excitation temperatures in CH4/H2and C3H8/H2RF discharges by optical emission spectroscopy

Chingsungnoen, Artit; Wilson, J.I.B.; Amornkitbamrung, Vittaya; Thomas, C. E.; Burinprakhon, Thanusit

doi:10.1088/0963-0252/16/3/002

Cited by 33 publications

(14 citation statements)

References 29 publications

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“…The OH signal is possibly coming from the H 2 O impurities in the gas and/or solvents. The observed intensity changes in the atomic argon emission lines in the plasma‐solution system could be due to changes in the electron energy distribution . Additional transition lines from carbon fragments were present in the optical emission spectrum of the plasma‐solution system: a CH band (X 2 ∏←B 2 ∑ − and X 2 ∏←A 2 Δ) at 386.89 and 431.19 nm, respectively, and the Swan system of C 2 lines (X 3 ∏ u ←A 3 ∏ g ) at 473.5, 516.29, 558.11, and 563.26 nm .…”

Section: Resultsmentioning

confidence: 96%

Investigation of plasma‐induced chemistry in organic solutions for enhanced electrospun PLA nanofibers

Rezaei

Gorbanev²,

Chys

et al. 2018

Plasma Processes & Polymers

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Electrospinning is a versatile technique for the fabrication of polymer‐based nano/microfibers. Both physical and chemical characteristics of pre‐electrospinning polymer solutions affect the morphology and chemistry of electrospun nanofibers. An atmospheric‐pressure plasma jet has previously been shown to induce physical modifications in polylactic acid (PLA) solutions. This work aims at investigating the plasma‐induced chemistry in organic solutions of PLA, and their effects on the resultant PLA nanofibers. Therefore, very broad range of gas, liquid, and solid (nanofiber) analyzing techniques has been applied. Plasma alters the acidity of the solutions. SEM studies illustrated that complete fiber morphology enhancement only occurred when both PLA and solvent molecules were exposed to pre‐electrospinning plasma treatment. Additionally, the surface chemistry of the PLA nanofibers was mostly preserved.

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Section: Resultsmentioning

confidence: 96%

Investigation of plasma‐induced chemistry in organic solutions for enhanced electrospun PLA nanofibers

Rezaei

Gorbanev²,

Chys

et al. 2018

Plasma Processes & Polymers

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“…The experimental points are within these predictions. For an initial propane concentration lower than 2500 ppm, the best agreement is obtained when only reactions (14) and (15) are taken into account. However the agreement can be roughly achieved on the whole range of propane concentration, line denoted A in figure 5 …”

Section: Propane Dissociation Productsmentioning

confidence: 93%

“…Owing to other types of previously developed applications of low pressure plasmas, for example carbon compounds thin films production [14], numerous works have been performed in the past about electron collisions on this hydrocarbon molecule [15][16][17][18], especially on ionisation processes. However, there is a lack of knowledge about dissociation processes of propane, in particular through quenching collisions of the nitrogen metastable electronic states [19,20], in high-pressure and low temperature pulsed discharge plasmas of molecular gases.…”

Section: Introductionmentioning

confidence: 99%

Propane dissociation in a non-thermal high-pressure nitrogen plasma

Moreau¹,

Pasquiers²,

Blin-Simiand³

et al. 2010

J. Phys. D: Appl. Phys.

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Abstract. The removal and the conversion processes of propane in N 2 /C 3 H 8 mixtures (concentration of hydrocarbon molecules up to 5500 ppm) energised by a photo-triggered discharge (homogeneous plasma) are studied at 460 mbar total pressure, both experimentally and theoretically. A self-consistent 0D discharge and kinetic model is used to interpret chromatographic measurements of propane and some by-products concentrations (hydrogen and hydrocarbons with 2 or 3 carbon atoms). It is suggested, from the comparison between measurements and model predictions, that quenching processes of nitrogen metastable states by C 3 H 8 lead to the dissociation of the hydrocarbon molecule, and are the most important processes for the removal of propane. Such a result is obtained using the quenching coefficient value previously determined by Callear and Wood for the A 3 Σ + u state [19], whereas the coefficient for collisions of the singlet states with C 3 H 8 is estimated to be 3.0x10 -10 cm 3 s -1 in order to explain the measured propane disappearance in the N 2 / C 3 H 8 mixture excited by the photo-triggered discharge. The hydrogen molecule is the measured most populated by-product and, also from the comparison between experimental results and model predictions, the most probable dissociation products of propane appear to be H 2 and C 3 H 6 . The propene molecule is also efficiently dissociated by quenching processes of N 2 states, and probably leads to the production of hydrogen atoms and methyl radicals with equivalent probabilities. The kinetic model predicts that the carbon atom is distributed amongst numerous molecules, including HCN, CH 4 , C 2 H 2 , C 2 H 4 , C 2 H 6 , C 3 H 6 .

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“…Electron impact dissociation of methyl radical ultimately leads to the formation of carbon atom through CH 2 and CH species. The presence of C and CH are confirmed through their characteristic emission ( figure 14) [42][43][44] measured using echelle spectrometer. In addition to the production of molecular argon ion (Ar 2 + ) through termolecular reaction, argon ion (Ar + ) also produces CH 3 + ion through a high probable reaction with methane.…”

Section: Chemical Kineticsmentioning

confidence: 99%

Amorphous carbon film deposition on the inner surface of tubes using atmospheric pressure pulsed filamentary plasma source

Pothiraja¹,

Bibinov²,

Awakowicz³

2011

J. Phys. D: Appl. Phys.

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Uniform amorphous carbon film is deposited on the inner surface of quartz tube having the inner diameter of 6 mm and the outer diameter of 8 mm. A pulsed filamentary plasma source is used for the deposition. Long plasma filaments (~ 140 mm) as a positive filamentary discharge are generated inside the tube in argon with methane admixture. FTIR-ATR, XRD, SEM, LSM and XPS analyses give the conclusion that deposited film is amorphous composed of non-hydrogenated sp 2 carbon and hydrogenated sp 3 carbon. Plasma is characterized using optical emission spectroscopy, voltage-current measurement, microphotography and numerical simulation. On the basis of observed plasma parameters, the kinetics of the film deposition process is discussed.

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Spatially resolved atomic excitation temperatures in CH₄/H₂and C₃H₈/H₂RF discharges by optical emission spectroscopy

Cited by 33 publications

References 29 publications

Investigation of plasma‐induced chemistry in organic solutions for enhanced electrospun PLA nanofibers

Investigation of plasma‐induced chemistry in organic solutions for enhanced electrospun PLA nanofibers

Propane dissociation in a non-thermal high-pressure nitrogen plasma

Amorphous carbon film deposition on the inner surface of tubes using atmospheric pressure pulsed filamentary plasma source

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