Electrochemical response of ZrCN-Ag-a(C,N) coatings in simulated body fluids

Calderón, Sebastián; Cavaleiro, A.; Carvalho, S.

doi:10.1016/j.electacta.2015.07.083

Cited by 14 publications

(9 citation statements)

References 47 publications

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“…3. an OCP value around −0.006 V, which was somehow predictable taking into account the mixed potential theory which predicts that for two conductive phases in electrical contact the OCP should be located between the OCP values of its components [37], supporting the idea of galvanic couple between nc-Ag and the a-C matrix to enhance the silver ion release.…”

Section: Coatings Electrochemical Properties and Ag Ionization Ratesupporting

confidence: 61%

Antibacterial Ag/a-C nanocomposite coatings: The influence of nano-galvanic a-C and Ag couples on Ag ionization rates

Manninen

Calderón

Carvalho

et al. 2016

Applied Surface Science

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Biofilm formation has been pointed as a major concern in different industrial applications, namely on biomedical implants and surgical instruments, which has prompted the development of new strategies for production of efficient antimicrobial surfaces. In this work, nano-galvanic couples were created to enhance the antibacterial properties of silver, by embedding it into amorphous carbon (a-C) matrix. The developed Ag/a-C nanocomposite coatings, deposited by magnetron sputtering, revealed an outstanding antibacterial activity against Staphylococcus epidermidis, promoting a total reduction in biofilm formation with no bacteria counts in all dilution. The open circuit potential (OCP) tests in 0.9% NaCl confirmed that a-C shows a positive OCP value, in contrast to Ag coating, thus enhancing the ionization of biocidal Ag + due to the nano-galvanic couple activation. This result was confirmed by the inductively coupled plasma-optical emission spectroscopy (ICP-OES), which revealed a higher Ag ionization rate in the nanocomposite coating in comparison with the Ag coating. The surface of Ag/a-C and Ag coatings immersed in 0.9% NaCl were monitored by scanning electron microscopy (SEM) over a period of 24 h, being found that the Ag ionization determined by ICP-OES was accompanied by an Ag nanoparticles coalescence and agglomeration in Ag/a-C coating.

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Section: Coatings Electrochemical Properties and Ag Ionization Ratesupporting

confidence: 61%

Antibacterial Ag/a-C nanocomposite coatings: The influence of nano-galvanic a-C and Ag couples on Ag ionization rates

Manninen

Calderón

Carvalho

et al. 2016

Applied Surface Science

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“…Dhandapani et al [29], for instance, observed a decrease in the current density as the silver increased in the DLC matrix up to $8 at.%, followed by deterioration of the corrosion resistance; the improvements in the corrosion resistance were hypothetically attributed to the increase in the sp 2 /sp 3 ratio. A reduction of the corrosion current has also been observed for a ZrCN-Ag coating with silver values below 8-9 at.% [40,137]. This behavior was more evident for well-packed column morphologies and for ZrCN-Ag without amorphous phases, corroborating the synergetic effect of the composition and morphology of the coatings.…”

Section: Electrochemical Propertiesmentioning

confidence: 55%

“…Contact angles of ceramic-Ag coatings measured with water, reported for ZrO 2 -Ag[17], ZrCN-Ag[41,137], ZrON-Ag[105], TaN-Ag[69], DLC-Ag[19], TiCN-Ag[4,26], TiN-Ag[12], and TiO 2 -Ag[11].…”

mentioning

confidence: 99%

Functional properties of ceramic-Ag nanocomposite coatings produced by magnetron sputtering

Calderón

Cavaleiro

Carvalho

2016

Progress in Materials Science

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127

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In recent years, the use of nanocomposite materials to functionalize surfaces has been investigated, taking advantage of the complementary properties of the nanocomposite constituents. Among this family of materials, ceramic-Ag coatings have been widely studied due to the large variety of functionalities that silver possesses and the possibility of tuning the coating's practical features by selecting the proper matrix to support this noble metal. Therefore, this review focuses on the effects of silver nanoparticles on the functional properties of ceramic-Ag nanocomposites. The chemistry, structure, morphology and topography of the coatings are analyzed with respect to the changes produced by the silver nanoparticles' distribution, amount and sizes and by altering production process variables. To offer a clear understanding of the functionalities of these materials, the optical, electrical, mechanical, tribological, electrochemical and biological properties reported in the last decade are reviewed, focusing on the ability to tune such properties by modifying the silver distribution, morphology and composition. In particular, the surface plasmon resonance, self-lubricating ability and antibacterial effect of silver are covered in detail, establishing their correlation with factors such as silver diffusion, segregation and ionization.

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“…Particularly, when silver is incorporated in large quantities, the polarization resistance is reduced as silver amount increases in TiN [33] and ZrCN [36,37], as a result of the higher electroctrochemical activity of silver. Moreover, the addition of Si to Me-Si-N films can change and improve some properties of the coatings, such as surface hardness and corrosion resistance [38].…”

Section: Effect Of Metals Incorporation On Me(c)n Electrochemical Resmentioning

confidence: 99%

“…Nonetheless, it must be taken into consideration that the electrochemical corrosion behaviour of MeCN largely depends on the stoichiometry of the compound. An excess of carbon in the carbonitride may create a larger number of interfaces between the MeN(C) and carbon phases, which can induce higher electrochemical porosity of the coatings [36,37].…”

Section: Influence Of Coating's Growthmentioning

confidence: 99%

Electrochemical Corrosion of Nano-Structured Magnetron-Sputtered Coatings

et al. 2019

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Magnetron sputtering has been employed for several decades to produce protective and multi-functional coatings, thanks to its versatility and ability to achieve homogeneous layers. Moreover, it is suitable for depositing coatings with very high melting points and that are thermodynamical unstable, which is difficult to accomplish by other techniques. Among these types of coating, transition metal (Me) carbides/nitrides (MeC/N) and amorphous carbon (a-C) films are particularly interesting because of the possibility of tailoring their properties by selecting the correct amount of phase fractions, varying from pure MeN, MeC, MeCN to pure a-C phases. This complex phase mixture can be even enhanced by adding a fourth element such Ag, Pt, W, Ti, Si, etc., allowing the production of materials with a large diversity of properties. The mixture of phases, resulting from the immiscibility of phases, allows increasing the number of applications, since each phase can contribute with a specific property such as hardness, self-lubrication, antibacterial ability, to create a multifunctional material. However, the existence of different phases, their fractions variation, the type of transition metal and/or alloying element, can drastically alter the global electrochemical behaviour of these films, with a strong impact on their stability. Consequently, it is imperative to understand how the main features intrinsic to the production process, as well as induced by Me and/or the alloying element, influence the characteristics and properties of the coatings and how these affect their electrochemical behaviour. Therefore, this review will focus on the fundamental aspects of the electrochemical behaviour of magnetron-sputtered films as well as of the substrate/film assembly. Special emphasis will be given to the influence of simulated body fluids on the electrochemical behaviour of coatings.

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Electrochemical response of ZrCN-Ag-a(C,N) coatings in simulated body fluids

Cited by 14 publications

References 47 publications

Antibacterial Ag/a-C nanocomposite coatings: The influence of nano-galvanic a-C and Ag couples on Ag ionization rates

Antibacterial Ag/a-C nanocomposite coatings: The influence of nano-galvanic a-C and Ag couples on Ag ionization rates

Functional properties of ceramic-Ag nanocomposite coatings produced by magnetron sputtering

Electrochemical Corrosion of Nano-Structured Magnetron-Sputtered Coatings

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