Atmospheric pressure non-equilibrium plasma jet technology: general features, specificities and applications in surface processing of materials

Fanelli, Fiorenza; Fracassi, Francesco

doi:10.1016/j.surfcoat.2017.05.027

Cited by 150 publications

(128 citation statements)

References 234 publications

(659 reference statements)

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“…We investigated and optimized the experimental conditions of processes carried out using DBDs fed with: i)pure helium (i.e., the DBD process main gas), as representative of plasma treatment; ii)helium/1% oxygen (He/O 2 ) mixture, that could induce considerable enzyme etching; iii)helium/ethylene mixtures to obtain PE‐CVD and overcoat the enzyme with a polyethylene‐like thin film.…”

Section: Resultsmentioning

confidence: 99%

Atmospheric Pressure Cold Plasma: A Friendly Environment for Dry Enzymes

Fanelli

Fracassi

Lapenna

et al. 2018

Adv Materials Inter

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A comprehensive study of the interaction of cold atmospheric pressure plasmas (CAPs) with dry enzymes is conducted to identify the experimental conditions that allow preserving enzyme functionality. Glucose oxidase (GOx) dry deposits are exposed to dielectric barrier discharges fed with pure helium, helium–oxygen, and helium–ethylene mixtures. The GOx loses functionality upon exposure to He/O2 CAP due to dry etching. X‐ray photoelectron spectroscopy reveals that, in parallel with the ablation, there are modifications of the chemical structure of the surface of the enzyme deposit that decrease the etching rate and eventually lead to a “crust” with a strong resistance against the ablation, responsible of process termination. Interestingly, the customary conditions used for plasma‐enhanced chemical vapor deposition using helium–ethylene mixtures (applied voltage <1.1 kVrms and exposure time ≤10 min) are friendly for GOx. It is therefore possible to immobilize enzymes by overcoating with a plasma‐deposited thin film, fully retaining enzyme functionality.

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Section: Resultsmentioning

confidence: 99%

Atmospheric Pressure Cold Plasma: A Friendly Environment for Dry Enzymes

Fanelli

Fracassi

Lapenna

et al. 2018

Adv Materials Inter

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“…An afterglow region over a few centimeters, namely the post-discha rg e, as indicated Fig. 1, is created at the outlet of the nozzle, which is directed toward the sample [15]. The post-discharge contains reactive species such as metastables, neutrals, and radicals, but not ionized species [9,16].…”

Section: Atmospheric Pressure Plasma Setupmentioning

confidence: 99%

Fine-tuning of chemical and physical polymer surface modifications by atmospheric pressure post-discharge plasma and its correlation with adhesion improvement

Brès

Sanchot

Rives

et al. 2019

Surface and Coatings Technology

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This is an author's version published in: http://oatao.univ-toulouse.fr/23772 ARTICLE INFO ABSTRACTKeywords: Three•polnt bendlng test Cross-eut test Adheslon mechanJsms Atmospherlc pressure plasma PEEKmatrlxOur study focuses on the use of a remote atmospheric pressure plasma process for the improvement of polymer surface reactivity. Indeed, surface activation of carbon-fiber-reinforced pol ym ers that use a poly etheretherketone matrix is required to achieve strong and long-term adhesion of paint on the composite. Emphasis 111,ill be placed on the contribution of gas plasma used on surface modification. We use two techniques to characterize adherence improvement: a qualitative and industrial approach with a cross-eut test and a quantitative approach with a three-point bending test. However, to provide a better understanding of the plasma-induced modifications ttsing air or nitrogen gas, diagnostics of the surface are also necessary. The wettability improvement, chemical surface modifications, and topography are analyzed by using contact angle measurement, X-ray photoelectron spectroscopy, and atomic force microscopy, respectively. The combination of these diagnostics highlights the capability of plasma treatrnent to tune the plasma/surface interactions de pending on gas plasma, which results in improved adhesion. E-mail address: nicolas.naude@laplace.univ-tlse.fr ( N . Naudé). https://doi.org/10.1016/j.surfcoat.2019.01.102 2.6. Interface characterization by three-point bending test 2. 6.1. Relevance of the test Among the wide variety of mechanical tests, three-point bending test according to ISO 14679:1997 [19] presents some advantages in the context of this study. The good repeatability of the results, as a result of the tensile machine, coupled with the numerous types of exploitable information that can be obtained, ma.kes this test useful for a better

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“…In addition, in our early work [53], Ar plasma offered an acceptable antibacterial activity for removal of E. coli due to remarkable increment in the surface roughness (RMS) of Ag thin film with thickness of 120 nm (about 9 nm) compared to He plasma. Surface modification by nonequilibrium plasmas at atmospheric pressure can be accomplished by using two different approaches, i.e., the "direct (touch mode)" and the "remote (non-touch mode)" approach [29,59]. The plasma treatment employed in this research is based on the direct mode, where the substrate is located in the plasma generation region and is directly exposed to the plasma plume.…”

Section: Details Of Plasma Processing For Perpendicular Appjmentioning

confidence: 99%

Effects of different gas flow rates and non-perpendicular incidence angles of argon cold atmospheric-pressure plasma jet on silver thin film treatment

et al. 2019

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In this study, the influences of variations in the gas flow rate and incidence angles of argon cold atmospheric-pressure plasma jet on the morphology and absorption spectra of silver thin films (60 nm, 80 nm, and 100 nm film thickness) are investigated. To evaluate the surface morphology, atomic force microscopy (AFM) was employed on the silver thin film surface before and after plasma processing. To analyze the effect of plasma treatment on the grain size, the one-dimensional AFM surface profiles of Ag thin films are approximated using a Gaussian function. The absorbance of Ag thin films is measured in wavelength range of 190-1100 nm utilizing UV-Vis absorption spectrometer. Compared to the gas flow rates 0.5 standard litter per minute (SLM) and 2 SLM, surface treatment of Ag thin film with gas flow rate of 1 SLM increased the valley depth, the peak valley height, and the distance between two deepest valleys remarkably. A sequential argon plasma treatment (2-min plasma treatment perpendicular to surface was followed by 2-min plasma processing with non-perpendicular incidence angle of 60°) offers considerable improvement in the uniformity of grains and also changes shape of grains, especially the peak height (about 44 times higher than untreated sample) and area of grains (almost 136 times greater than untreated sample) which can be applicable for optical sensing technology. Keywords Non-perpendicular incidence angle of argon cold atmospheric-pressure plasma jet (APPJ) • Gas flow rate • Absorption spectra • Surface morphology • Analysis of silver grain size • Gaussian function

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Atmospheric pressure non-equilibrium plasma jet technology: general features, specificities and applications in surface processing of materials

Cited by 150 publications

References 234 publications

Atmospheric Pressure Cold Plasma: A Friendly Environment for Dry Enzymes

Atmospheric Pressure Cold Plasma: A Friendly Environment for Dry Enzymes

Fine-tuning of chemical and physical polymer surface modifications by atmospheric pressure post-discharge plasma and its correlation with adhesion improvement

Effects of different gas flow rates and non-perpendicular incidence angles of argon cold atmospheric-pressure plasma jet on silver thin film treatment

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