Characterization and antibacterial functions of Ag–TiO2 and W–TiO2 nanostructured thin films prepared by sol-gel/laser-induced technique

Joya, Yasir F.; Liu, Z.; Wang, T.

doi:10.1007/s00340-011-4600-6

Cited by 11 publications

(7 citation statements)

References 26 publications

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“…It is known that smaller materials have high antimicrobial capacities in comparison with larger materials, 64 and the increase in the surface area of the particles holds the advantage of efficiently binding to microorganisms for enhanced antimicrobial action. 65 Wu et al 13 observed the correlation among particle size, specific surface area, and antibacterial activity in Ag 3 PO 4 micro- and nanoparticles. In this case, as the particle size decreased, the specific surface area increased, consequently enhancing the antibacterial activity against Escherichia coli and Bacillus subtilis .…”

Section: Resultsmentioning

confidence: 99%

“…The substitution of P 5+ by W 6+ yields a decrease in particle size and a consequent increase in surface area (Table ), which could be the main cause for the excellent bactericidal activity of the Ag 3 PO 4 :W 1% sample. It is known that smaller materials have high antimicrobial capacities in comparison with larger materials, and the increase in the surface area of the particles holds the advantage of efficiently binding to microorganisms for enhanced antimicrobial action . Wu et al observed the correlation among particle size, specific surface area, and antibacterial activity in Ag 3 PO 4 micro- and nanoparticles.…”

Section: Resultsmentioning

confidence: 99%

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Rational Design of W-Doped Ag₃PO₄ as an Efficient Antibacterial Agent and Photocatalyst for Organic Pollutant Degradation

et al. 2020

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Bacterial and organic pollutants are major problems with potential adverse impacts on human health and the environment. A promising strategy to alleviate these impacts consists in designing innovative photocatalysts with a wider spectrum of application. In this paper, we report the improved photocatalytic and antibacterial activities of chemically precipitated Ag 3 PO 4 microcrystals by the incorporation of W at doping levels 0.5, 1, and 2 mol %. The presence of W directly influences the crystallization of Ag 3 PO 4 , affecting the morphology, particle size, and surface area of the microcrystals. Also, the characterization via experimental and theoretical approaches evidenced a high density of disordered [AgO 4 ], [PO 4 ], and [WO 4 ] structural clusters due to the substitution of P 5+ by W 6+ into the Ag 3 PO 4 lattice. This leads to new defect-related energy states, which decreases the band gap energy of the materials (from 2.27 to 2.04 eV) and delays the recombination of e′–h • pairs, leading to an enhanced degradation process. As a result of such behaviors, W-doped Ag 3 PO 4 (Ag 3 PO 4 :W) is a better visible-light photocatalyst than Ag 3 PO 4 , demonstrated here by the photodegradation of potential environmental pollutants. The degradation of rhodamine B dye was 100% in 4 min for Ag 3 PO 4 :W 1%, and for Ag 3 PO 4 , the obtained result was 90% of degradation in 15 min of reaction. Ag 3 PO 4 :W 1% allowed the total degradation of cephalexin antibiotic in only 4 min, whereas pure Ag 3 PO 4 took 20 min to achieve the same result. For the degradation of imidacloprid insecticide, Ag 3 PO 4 :W 1% allowed 90% of degradation, whereas Ag 3 PO 4 allowed 40%, both in 20 min of reaction. Moreover, the presence of W-dopant results in a 16-fold improvement of bactericidal performance against methicillin-resistant Staphylococcus aureus . The outstanding results using the Ag 3 PO 4 :W material demonstrated its potential multifunctionality for the control of organic pollutants and bacteria in environmental applications.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Rational Design of W-Doped Ag₃PO₄ as an Efficient Antibacterial Agent and Photocatalyst for Organic Pollutant Degradation

et al. 2020

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“…Furthermore, Ag NPs have been known as effective antimicrobial agents with broad-spectrum antibacterial activity, good durability, heat resistance and stability [18,19] . Recently, TiO 2 /Ag composites with different morphologies were prepared by a range of various methods, including UV-irradiation, [16] solvothermal, [20] sol-gel, [21] and chemical deposition [22] . For example, Liu et.…”

Section: Introductionmentioning

confidence: 99%

Highly synergistic antimicrobial activity of spherical and flower-like hierarchical titanium dioxide/silver composites

Cheng

et al. 2017

Journal of Colloid and Interface Science

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ABSTRACT:A spherical titanium dioxide/silver (TiO 2 /Ag) composite and a flower-like hierarchical TiO 2 /Ag composite were prepared via a template-induced method and a solvothermal method based on the Ag/Carbon spheres templates followed by calcination treatment, respectively. The morphologies of the composites were controlled by changing the concentration of reactants and calcination temperature. The antibacterial efficiency of the composites was evaluated with both Gram-negative Escherichia coli and 2 species (ROS) and silver ions were observed, which lead to superior antibacterial activities of these TiO 2 /Ag composites with a bacteriostatic rate as high as 99% even in the absence of light. The morphological effect of the composites on the antibacterial efficacy was also investigated. In addition, a durable antimicrobial coating was also fabricated by incorporating the hierarchical TiO 2 /Ag composite into a commercial emulsion solution of polyvinyl acetate, which exhibited a promising application in bacterial sensitive locations.

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“…29,35−37 AgNPs have also been reported to reduce microbial infection in skin and burn wounds and to prevent bacterial colonization on various devices surfaces such as catheters and implants. 38−42 Compared with conventional antimicrobacterial molecules, AgNPs with the advantage of large surface areas bind efficiently to microorganisms and provide enhanced antimicrobial action, 17,43,44 and AgNPS, alone or supported on a ceramic support, are used as antimicrobial fillers in textiles 45 and polymers 46 for food-packaging 47 and biomedical applications, 48,49 for antimicrobial paints, 50 and potentially for drug delivery. 51 In addition, AgNPS are less toxic to human cells as compared to other metals.…”

Section: Introductionmentioning

confidence: 99%

Potentiated Electron Transference in α-Ag₂WO₄ Microcrystals with Ag Nanofilaments as Microbial Agent

et al. 2014

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This study is a framework proposal for understanding the antimicrobacterial effect of both α-Ag 2 WO 4 microcrystals (AWO) synthesized using a microwave hydrothermal (MH) method and α-Ag 2 WO 4 microcrystals with Ag metallic nanofilaments (AWO:Ag) obtained by irradiation employing an electron beam to combat against planktonic cells of methicillin-resistant Staphylococcus aureus (MRSA). These samples were characterized by X-ray diffraction (XRD), FT-Raman spectroscopy, ultraviolet visible (UV−vis) measurements, field emission scanning electron microscopy (FE-SEM), transmission electron microscopy (TEM), and high resolution transmission electron microscopy (HRTEM). The results reveal that both AWO and AWO:Ag solutions have bacteriostatic and bactericidal effects, but the irradiated sample is more efficient; i.e., a 4-fold of the MRSA planktonic cells as compared to the nonirradiated sample was observed. In addition, first principles calculations were performed to obtain structural and electronic properties of AWO and metallic Ag, which provides strong quantitative support for an antimicrobacterial mechanism based on the enhancement of electron transfer processes between α-Ag 2 WO 4 and Ag nanoparticles.

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Characterization and antibacterial functions of Ag–TiO2 and W–TiO2 nanostructured thin films prepared by sol-gel/laser-induced technique

Cited by 11 publications

References 26 publications

Rational Design of W-Doped Ag₃PO₄ as an Efficient Antibacterial Agent and Photocatalyst for Organic Pollutant Degradation

Rational Design of W-Doped Ag₃PO₄ as an Efficient Antibacterial Agent and Photocatalyst for Organic Pollutant Degradation

Highly synergistic antimicrobial activity of spherical and flower-like hierarchical titanium dioxide/silver composites

Potentiated Electron Transference in α-Ag₂WO₄ Microcrystals with Ag Nanofilaments as Microbial Agent

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Characterization and antibacterial functions of Ag–TiO2 and W–TiO2 nanostructured thin films prepared by sol-gel/laser-induced technique

Cited by 11 publications

References 26 publications

Rational Design of W-Doped Ag3PO4 as an Efficient Antibacterial Agent and Photocatalyst for Organic Pollutant Degradation

Rational Design of W-Doped Ag3PO4 as an Efficient Antibacterial Agent and Photocatalyst for Organic Pollutant Degradation

Highly synergistic antimicrobial activity of spherical and flower-like hierarchical titanium dioxide/silver composites

Potentiated Electron Transference in α-Ag2WO4 Microcrystals with Ag Nanofilaments as Microbial Agent

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Rational Design of W-Doped Ag₃PO₄ as an Efficient Antibacterial Agent and Photocatalyst for Organic Pollutant Degradation

Rational Design of W-Doped Ag₃PO₄ as an Efficient Antibacterial Agent and Photocatalyst for Organic Pollutant Degradation

Potentiated Electron Transference in α-Ag₂WO₄ Microcrystals with Ag Nanofilaments as Microbial Agent