Infrared gas phase study on plasma-polymer interactions in high-current diffuse dielectric barrier discharge

Abstract

Document VersionPublisher's PDF, also known as Version of Record (includes final page, issue and volume numbers) Please check the document version of this publication:• A submitted manuscript is the author's version of the article upon submission and before peer-review. There can be important differences between the submitted version and the official published version of record. People interested in the research are advised to contact the author for the final version of the publication, or visit the DOI to the publisher's website.• The final author version and the galley proof are versions of the publication after peer review.• The final published version features the final layout of the paper including the volume, issue and page numbers. Link to publication General rightsCopyright and moral rights for the publications made accessible in the public portal are retained by the authors and/or other copyright owners and it is a condition of accessing publications that users recognise and abide by the legal requirements associated with these rights.• Users may download and print one copy of any publication from the public portal for the purpose of private study or research.• You may not further distribute the material or use it for any profit-making activity or commercial gain • You may freely distribute the URL identifying the publication in the public portal ? Take down policyIf you believe that this document breaches copyright please contact us providing details, and we will remove access to the work immediately and investigate your claim. Infrared gas phase study on plasma-polymer interactions in high-current diffuse dielectric barrier discharge A roll-to-roll high-current diffuse dielectric barrier discharge at atmospheric pressure was operated in air and Ar/N 2 /O 2 gas mixtures. The exhaust gas from the discharge was studied using a highresolution Fourier-transform infrared spectrometer in the range from 3000 to 750 cm À1 to unravel the plasma-polymer interactions. The absorption features of H x N y O z , CO x , and HCOOH (formic acid) were identified, and the relative densities were deduced by fitting the absorption bands of the detected molecules. Strong interactions between plasma and polymer (Polyethylene-2,6-naphthalate, or PEN) in precursor-free oxygen-containing gas mixtures were observed as evidenced by a high CO x production. The presence of HCOOH in the gas effluent, formed through plasmachemical synthesis of CO x , turns out to be a sensitive indicator for etching. By adding tetraethylorthosilicate precursor in the plasma, dramatic changes in the CO x production were measured, and two distinct deposition regimes were identified. At high precursor flows, a good agreement with the precursor combustion and the CO x production was observed, whereas at low precursor flows an etching-deposition regime transpires, and the CO x production is dominated by polymer etching. Published by AIP Publishing. [http://dx

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“…For instance, it can be speculated that O and O-containing species react with the N present in the plasma to form NO, NO 2 , and N 2 O. Such reaction pathways have been often reported for DBD plasmas based on a N 2 –O 2 mixture. , …”

“…Such reaction pathways have been often reported for DBD plasmas based on a N 2 –O 2 mixture. 62 , 63 …”

“…Such reaction pathways have been often reported for DBD plasmas based on a N 2 −O 2 mixture. 62,63 Finally, the weak infrared absorbance signal around 2900 cm −1 by the C−H stretching mode points to the presence of hydrocarbons. These species can originate from incomplete combustion of the amine ligands at the surface or can be formed in subsequent gas-phase reaction pathways, where O atoms react with the ethyl groups that are released in the plasma.…”

Carbon Monoxide in Plasma and Agriculture: Just a Foe or a Potential Friend?

“…IR light can interact with the CO molecule and therefore be measured by means of an absorption method that is based on the Beer-Lambert law. [131][132][133] Fourier-transform IR (FTIR) absorption spectroscopy and laser absorption, both based on this law, use, respectively, a broadband light and a laser as light source. FTIR absorption yields broad absorption spectra with low sensitivity, 132 whereas laser absorption can measure a very small amount of CO (< 1 ppm) on a very narrow spectral range.…”

“…[131][132][133] Fourier-transform IR (FTIR) absorption spectroscopy and laser absorption, both based on this law, use, respectively, a broadband light and a laser as light source. FTIR absorption yields broad absorption spectra with low sensitivity, 132 whereas laser absorption can measure a very small amount of CO (< 1 ppm) on a very narrow spectral range. A quantum cascade laser is generally used instead of its ancestor, the lead salt laser, 131 and a temporal resolution down to 100 ns is, in principle, feasible.…”