PVD-grown antibacterial Ag-TiN films on piezoelectric PVDF substrates for sensor applications

Marques, S. M.; Carvalho, Isabel; Henriques, Mariana; Polcar, Tomáš; Carvalho, S.

doi:10.1016/j.surfcoat.2015.09.057

Cited by 22 publications

(18 citation statements)

References 33 publications

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“…Meanwhile, control sample and coatings without Ag (control samples) were colonized by bacteria. These results are ascribed to silver diffusion through the agar [56] and are in agreement with the chemical composition of the samples presented on Table 2. The halo around the sample is larger on the sample containing a higher amount of silver (Fig.…”

Section: Antibacterial and Antibiofouling Testssupporting

confidence: 90%

“…In fact, Ag-TiN coating presents three-sided pyramidal shaped grains, uniformly on a more open surface, induced by the grow of a second silver phase. For samples with silver and high oxygen content it is possible to see the presence of Ag clusters and some aggregates on the surface as it has been reported in other studies [34][35][36]. The formation of Ag nanoparticles is related to the immiscibility of Ag in the Ti(O)N matrix.…”

Section: Chemical and Morphology Characterizationsupporting

confidence: 68%

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Surface functionalization of 3D printed structures: Aesthetic and antibiofouling properties

Castro

Carneiro

Marques

et al. 2020

Surface and Coatings Technology

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Additive manufacturing (AM) is a hot topic nowadays, having a first order in importance in research trends, improving existent technologies and carrying them further. AM can be applied to ceramics, which have importance in current technologies. Their capability to maintain functional properties for long time periods, combined with the easiness to process and the abundance of raw materials, make them a fundamental part of mankind development. Within ceramics, stoneware has a wide range of uses but in some conditions, it can be affected by biofouling. Ti(O)N and Ag-Ti(O)N coatings over 3D printed stoneware, were presented as multifunctional solution, linking aesthetical and antimicrobial properties. Films were developed by reactive direct current (DC) magnetron sputtering and characterized physical, chemical and morphologically, as well as regarding their colour variation. Moreover roughness, wettability, antibacterial and antibiofouling were also evaluated. The results revealed that the Ag doped coatings (with or without oxygen addition) had an enhanced multifunctionality compared to control samples (without Ag). Ag nanoparticles addition created a surface with potential antibacterial and antibiofouling activities, in order to resist outdoors and aqueous environments, making these films able to be applied in architectural pieces as sculptures or other decorative parts, maintaining their properties with good aesthetical properties. implants, soft tissue replacements, drug deliveries, among others [2]; aerospace industry, in reduced volume parts and replacements parts for aircraft with advanced materials as aluminium alloys, titanium alloys, nickel super-alloys and special steels; automotive industry, in the development of some structural and engine parts; and tooling industry, like moulds with complex refrigeration systems enabling better performances and higher life time, [3]. Additive manufacturing, namely with metals and polymers, is no longer the future, it is the unavoidable present, but the additive manufacture of ceramic materials is still far from the desired maturity. Abundance, easy manipulation, low cost, heat resistance and long life time span are the main characteristics of ceramics [4] and across human history, new technologies have enlarged its uses. Chemically, ceramics can be considered as compounds formed between metallic and non-metallic elements with predominant ionic bonding but having a

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Section: Antibacterial and Antibiofouling Testssupporting

confidence: 90%

Section: Chemical and Morphology Characterizationsupporting

confidence: 68%

Surface functionalization of 3D printed structures: Aesthetic and antibiofouling properties

Castro

Carneiro

Marques

et al. 2020

Surface and Coatings Technology

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“…The use of Ag nanoparticles in real applications comprises its incorporation in different matrix materials, including polymers/textiles [14,15] or bioactive glass [16], as well as in nanocoatings [17][18][19][20][21][22][23][24][25][26][27]. In the specific case of nanocomposite coatings their deposition can follow different routes, namely, physical vapor deposition methods, which allow to deposit multifunctional nanocomposite coatings, based on metal (Me) oxides [19,20], nitrides [21,22], carbonitrides [23,24] or amorphous carbon [25][26][27] matrixes containing the Ag nanoparticles. In this context Ag-Ti coatings have also become very popular, own to their potential antibacterial activity and electrical properties, which are highly desirable for sensor applications [28,29].…”

Section: Introductionmentioning

confidence: 99%

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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“…We intended to control the diffusion of silver in the matrix to the coating surface toto control the ionization rate of the silver into the medium and thus have a controlled release of the antimicrobial agent over time. TiN coatings will be used as matrix because they present excellent chemical stability, biocompatibility, and outstanding mechanical properties, leading to a broad range of applications, including those in the biomedical area [ 16 , 17 ]. The silver addition (good antimicrobial agent) to the TiN films may lead to a softer coating, since silver presents a low Young’s Modulus in-creasing the plasticity of TiN [ 17 , 18 , 19 , 20 ].…”

Section: Introductionmentioning

confidence: 99%

Antimicrobial TiN-Ag Coatings in Leather Insole for Diabetic Foot

Marques

Carvalho

Leite³

et al. 2022

Materials

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This work reports on TiN-Ag antimicrobial coatings deposited by d.c. magnetron sputtering on leather used for insoles on the footwear industry, studies involving the antimicrobial properties of Ag-based functionalized leathers by sputtering techniques are shown. The X-ray diffraction (XRD) results suggested the presence of crystalline fcc-TiN phase for the sample without silver, and also a fcc-Ag phase in the samples containing silver. According to the Scanning Electron Microscopy (SEM) analysis, the coatings were homogeneous and dispersed Ag clusters were detected on the surface of samples with silver content above 8 at. %. The Inductively coupled plasma—optical emission spectrometry (ICP-OES) analysis showed that the ionization of silver over time depends on the morphology of the coatings. The samples did not present cytotoxicity and only samples with incorporated silver presented antibacterial and antifungal activity, highlighting the potential of the TiN-Ag insole coatings for diseases such as diabetic foot.

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PVD-grown antibacterial Ag-TiN films on piezoelectric PVDF substrates for sensor applications

Cited by 22 publications

References 33 publications

Surface functionalization of 3D printed structures: Aesthetic and antibiofouling properties

Surface functionalization of 3D printed structures: Aesthetic and antibiofouling properties

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

Antimicrobial TiN-Ag Coatings in Leather Insole for Diabetic Foot

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