Acetylene plasma polymer treated by atmospheric dielectric barrier discharge

Moreira, Pablo; Rangel, André; Conejo, Luíza dos Santos; Batista, Natássia Lona; Deus, R. C.; Nishime, Thalita Mayumi Castaldelli; Kodaira, Felipe Vicente de Paula; Campos, Kamila Amato de; Siqueira, Marcelo Barbosa; Kostov, K. G.; Mota, Ronaldo

doi:10.1016/j.vacuum.2014.01.026

Cited by 6 publications

(2 citation statements)

References 15 publications

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“…Acetylene is one of the monomers that can be easily deposited from the gas or plasma phase to form C:H coatings, and there is a lot of experimental data on plasma-polymerized acetylene (PPA), regarding the empirical conditions that influence the polymerization process as well as the investigation of the electrical, optical, mechanical, and biomedical properties of the PPA films. − Several parameters can be controlled during the plasma polymerization that affect the structural, physical, and chemical properties of the plasma polymer film for a given monomer: the monomer flow rate, discharge power, monomer pressure, and substrate temperature. Although the common deposition method of a-C:H films is vacuum plasma discharge, atmospheric pressure deposition has its own benefits. − Both hard and soft films can be grown in dielectric barrier discharge using acetylene, and this kind of discharge can produce a flux of thermalized radicals greatly exceeding the ion flux due to the high collision rate in the atmospheric pressure (see ref and references within).…”

Section: Introductionmentioning

confidence: 99%

Molecular Dynamics Simulations of Hydrocarbon Film Growth from Acetylene Monomers and Radicals: Effect of Substrate Temperature

et al. 2018

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In an attempt to rationalize the mechanisms occurring during plasma polymerization of acetylene, classical molecular dynamics computer simulations investigating the deposition and reaction of a mixed gas of acetylene molecules and radicals on the Ag(111) substrate were performed for a wide range of substrate temperatures. Prior to that, this article establishes a methodology for film deposition and identifies the appropriate potentials for hydrocarbons by comparison with electronic calculations using density functional theory. On the basis of this preliminary study, simulations of film growth are carried out at different temperatures using the reactive empirical bond order potential. Our results show that the rates of formation of new C–C and C–H bonds are higher at the beginning of the film growth when the substrate is still exposed than when it is covered with polymeric chains, and these initial reaction rates are proportional to temperature. The analysis of the hybridization of carbon atoms in the films shows that the substrate temperature increase leads to the formation of coatings containing more carbon atoms in the sp2 and sp3 configurations and less in the sp configuration with sp2 becoming dominant at high temperatures. We establish a polymerization–connectivity formalism that describes the structural transformation of the film during the deposition on the basis of each atom hybridization and bonding. Within this formalism, the evolution of the polymerization and the connection character of the polymers is observed and discussed.

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Section: Introductionmentioning

confidence: 99%

Molecular Dynamics Simulations of Hydrocarbon Film Growth from Acetylene Monomers and Radicals: Effect of Substrate Temperature

et al. 2018

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“…Wemlinger et al [22] polymerized acetylene in atmospheric pressure plasma chamber with deposition rate of 23 nm/s. Capote et al [23] reported that the variation of argon concentration Ar/(Ar + C 2 H 2 ) in a low pressure chamber changed the physical properties of films (deposition rate, roughness, adhesion, compressive stress and wear), showing that it was possible to grow acetylene films with desired characteristics for mechanical and tribological applications.…”

Section: Introductionmentioning

confidence: 99%

Deposition of thin films using argon/acetylene atmospheric pressure plasma jet

Castro

Kodaira

Prysiazhnyi

et al. 2017

Surface and Coatings Technology

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Atmospheric pressure plasma jet was used to deposit polymer films from argon/air/acetylene mixture. Depending on the gas composition, three modes of operation were observed and characterized. The film deposited by a stationary jet had a circular shape with area (where thickness was almost constant) about the nozzle inner diameter. The deposition rate of stationary jet decreased with the time: a film of 2 μm was obtained after the first two minutes, while in the next two minutes only 1.3 μm film was deposited. The plasma polymers were characterized by infrared spectroscopy, where variety of C\ \H and few C\ \O bonds were detected. By using a linear displacement system, we obtained homogeneous deposition over a larger area with deposition rate of about 330 nm/ min, showing the potential of such plasma jet system for large-scale depositions.

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