Effect of H2 and O2 plasma etching treatment on the surface of diamond-like carbon thin film

Yun, Deok Yong; Choi, Won Seok; Park, Yong Seob; Hong, Byungyou

doi:10.1016/j.apsusc.2008.03.170

Cited by 70 publications

(48 citation statements)

References 24 publications

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“…Recent studies have reported that modified DLC films improved biocompatibility, lubricity, stability, and cell adhesion [4][5][6][7][8]. According to Yun et al [4], these characteristics are related to structural bonds [9,10], surface roughness [11,12], and whether the film is hydrophobic or hydrophilic [13,14].…”

Section: Introductionmentioning

confidence: 99%

“…DLC consist of dense amorphous carbon or hydrocarbon, and their mechanical properties fall between those of graphite and diamond [1][2][3][4]. Due to their mechanical, electrical, optical, and chemical properties, the use of DLC coatings in mechanical and electrical fields has increased with recent applications in food, beverage, and medical markets [3].…”

Section: Introductionmentioning

confidence: 99%

“…According to Yun et al [4], these characteristics are related to structural bonds [9,10], surface roughness [11,12], and whether the film is hydrophobic or hydrophilic [13,14]. The DLC modification has been performed with different plasma treatments [4,15] or doping suitable elements such as Si [10,16], F [17,18], Ag [19,20], and so on.…”

Section: Introductionmentioning

confidence: 99%

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Antibacterial activity of DLC films containing TiO2 nanoparticles

Marciano

Lima-Oliveira

Silva

et al. 2009

Journal of Colloid and Interface Science

103

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Diamond-like carbon (DLC) films have been the focus of extensive research in recent years due to their potential applications as surface coatings on biomedical devices. Titanium dioxide (TiO2) in the anatase crystalline form is a strong bactericidal agent when exposed to near-UV light. In this work we investigate the bactericidal activity of DLC films containing TiO2 nanoparticles. The films were grown on 316L stainless-steel substrates from a dispersion of TiO2 in hexane using plasma-enhanced chemical vapor deposition. The composition, bonding structure, surface energy, stress, and surface roughness of these films were also evaluated. The antibacterial tests were performed against Escherichia coli (E. coli) and the results were compared to the bacterial adhesion force to the studied surfaces. The presence of TiO2 in DLC bulk was confirmed by Raman spectroscopy. As TiO2 content increased, I(D)/I(G) ratio, hydrogen content, and roughness also increased; the films became more hydrophilic, with higher surface free energy and the interfacial energy of bacteria adhesion decreased. Experimental results show that TiO2 increased DLC bactericidal activity. Pure DLC films were thermodynamically unfavorable to bacterial adhesion. However, the chemical interaction between the E. coli and the studied films increased for the films with higher TiO2 concentration. As TiO2 bactericidal activity starts its action by oxidative damage to the bacteria wall, a decrease in the interfacial energy of bacteria adhesion causes an increase in the chemical interaction between E. coli and the films, which is an additional factor for the increasing bactericidal activity. From these results, DLC with TiO2 nanoparticles can be useful for producing coatings with antibacterial properties.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Antibacterial activity of DLC films containing TiO2 nanoparticles

Marciano

Lima-Oliveira

Silva

et al. 2009

Journal of Colloid and Interface Science

103

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“…Hydrogen atomic radicals can be formed in discharge which leads to more effective reactive etching. Etching by hydrogen plasma causes incorporation of H and reduction of dangling bonds, unlike oxygen plasma which increases the number of dangling bonds [63]. It was observed that sputtering of the surface with a combination of hydrogen atoms and argon ion enhances sputtering more than their sum.…”

Section: Reactive Etching/plasma Treatment By Gases Containing Hydrogenmentioning

confidence: 90%

Microplasma Drug Delivery

Shimizu¹,

Krištof²

2018

Plasma Medicine - Concepts and Clinical Applications

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There are several techniques to perform drug delivery. One of the newest methods of drug delivery through the skin is the application of plasma. Reactive species generated by plasma can change the chemical composition of the skin, change the structure and extract lipids of the lipid barrier, create pores in or etch the surface of the skin. These changes have an influence on the barrier function of the skin which can be decreased. The main barrier of the skin is called stratum corneum. The structure and composition of the stratum corneum and function of the components is described. Possible interaction of plasma particles with skin is presented and compared with interaction of plasma species with carbon or hydrocarbon surfaces. Active species which can effectively interact with lipid molecules is introduced. Hydrophilic drugs and drugs with high molecular weight can penetrate very difficult through the skin or cannot penetrate the skin at all. As a model, a drug, Cyclosporine A, was studied. Cyclosporine A is a lipophilic drug with a molecular weight of 1203 Da which is used during and after organ transplantation to prevent rejection. The Hairless Yucatan micropig was used to simulate human skin. A film electrode was used to generate plasma that was used for skin treatment. An AC voltage (V 0-p = 0.6-1.5 kV, 25 kHz) was applied with flowing gas (5 L/min). The barrier function of the skin was evaluated by a Franz cell experiment and high performance liquid chromatography (HPLC) for a particular drug. An effective amount of drug in human body was determined by pharmacokinetic model.

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“…Therefore, it was possible to obtain the hydrophilic property for PCL films by oxygen plasma etching. This means that the high concentration of carbon-oxygen sites on the surface of PCL films by oxygen plasma etching contributed to the adsorption hysteresis related to the high surface energy 47) . The AFM observation showed that a random textured structure composed of pits, grooves, and protrusions was formed on all layer surfaces of 3D PCL scaffolds.…”

Section: Discussionmentioning

confidence: 99%