Tailoring the Bactericidal Activity of Ag Nanoparticles/α-Ag<sub>2</sub>WO<sub>4</sub>Composite Induced by Electron Beam and Femtosecond Laser Irradiation: Integration of Experiment and Computational Modeling

Macedo, Nadia G.; Machado, Thales R.; Roca, Román Alvarez; Assis, Marcelo; Foggi, Camila Cristina de; Puerto-Belda, Verónica; Mínguez‐Vega, Gladys; Rodrigues, André Filipe Lucchi; San-Miguel, Miguel A.; Cordoncillo, Eloísa; Beltrán‐Mir, Héctor; Andrés, Juán; Longo, E.

doi:10.1021/acsabm.8b00673

Cited by 36 publications

(28 citation statements)

References 71 publications

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“…The substitution of P 5+ by W 6+ yields a decrease in particle size and a consequent increase in surface area ( Table 2 ), 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, 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.…”

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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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%

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

et al. 2020

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“…Electron beam irradiation in the transmission electron microscopy (TEM) can be used to produce and manipulate nanostructures . Our research group has presented an in situ method used to obtain Ag nanoparticles on the surface of a semiconductor, providing first‐principles calculations in conjunction with experiments and advanced characterization to gain a deep insight into the formation of Ag nanoparticles and the nature of the mechanisms provoked by electron beam irradiation . The formation process for Ag particles on AgCl crystals induced by electron beam irradiation has been previously reported, while Formo et al.…”

Section: Introductionmentioning

confidence: 99%

Ag Nanoparticles/AgX (X=Cl, Br and I) Composites with Enhanced Photocatalytic Activity and Low Toxicological Effects

et al. 2020

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Periodic structures induced by electron irradiation are a unique phenomenon when electron beams irradiate on the surface of some materials. These periodic structures have potential for technological applications. However, the fuzzy nature of the electron-induced structuring hinders its further exploration in such applications. In this paper, novel Ag nanoparticle/AgX (X=Cl, Br and I) composites, with enhanced photocatalytic activity and low toxicological effects, were prepared, for the first time, using electron beam irradiation. The remarkable advantage of this approach is that the Ag nanoparticles/AgX composites can be easily prepared in one-step without the need for high-pressure conditions, surfactants, ionic liquids, or reducing agents. Furthermore, our method does not involve any toxic substances, which makes the as-synthesized samples highly applicable for technological applications. The structure, morphology and physicochemical properties of the Ag nanoparticles/AgX composites were studied using various characterization techniques. Using first-principles calculations based on density functional theory and the quantum theory of atoms in molecules, we reveal how the concentration of excess electrons in the AgX materials induces the formation of the Ag nanoparticles under electron beam irradiation. These results extend the fundamental understanding of the atomic process underlying the mechanism of AgÀ X bond rupture observed during the transformation induced via electron irradiation of the AgX crystals by increasing the total number of electrons in the bulk structure. Thus, our findings provide viable guidance for the realization of new materials for the degradation of contaminated wastewater with low toxicity.

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“…Therefore, there is still a lack of efficient and easy synthesis to avoid these drawbacks and obtain well-crystallized materials. Very recently, we presented the scale-up of the formation of Ag nanoparticles on α-Ag 2 WO 4 with bactericidal properties via fs laser irradiation 81,82 and the formation of Bi and In nanoparticles on NaBiO 3 83 and InP 84,85 under fs irradiation, respectively. This procedure offers the ability to selectively tailor nanomaterials and, in the above cases, to promote properties such as photoluminescence (PL) emissions, with concomitant applications on photodegradation processes and antimicrobial activity.…”

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Femtosecond-laser-irradiation-induced structural organization and crystallinity of Bi2WO6

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Gouveia

Doñate‐Buendía

et al. 2020

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controlling the structural organization and crystallinity of functional oxides is key to enhancing their performance in technological applications. in this work, we report a strong enhancement of the structural organization and crystallinity of Bi 2 Wo 6 samples synthetized by a microwave-assisted hydrothermal method after exposing them to femtosecond laser irradiation. X-ray diffraction, UVvis and Raman spectroscopies, photoluminescence emissions, energy dispersive spectroscopy, field emission scanning electron microscopy, and transmission electron microscopy were employed to characterize the as-synthetized samples. To complement and rationalize the experimental results, firstprinciples calculations were employed to study the effects of femtosecond laser irradiation. Structural and electronic effects induced by femtosecond laser irradiation enhance the long-range crystallinity while decreasing the free carrier density, as it takes place in the amorphous and liquid states. these effects can be considered a clear cut case of surface-enhanced Raman scattering.Bismuth tungstate, Bi 2 WO 6 (BWO), is an important n-type semiconductor with a narrowband gap energy (E gap ) of 2.8 eV that allows efficient absorption of visible light (λ > 400 nm) and has been widely studied due to its wide range of properties, such as ferroelectricity, piezoelectricity, pyroelectricity, nonlinear dielectric susceptibility, and photoluminescent emissions 1,2 . The multifunctionality of this material has been demonstrated on its photocatalytic activity 3-22 , photocatalytic degradation of drugs 23 , dyes 24-26 alcohols 27 , and phenol 28 , environmental purification, energy conversion 29 , and production of sustainable and combustible compounds 3 . Recently, some works attested this material to be efficient in water splitting for hydrogen generation 30-32 , for shielding against low-energy gamma rays 33 and for CT/IR imaging and photothermal/photodynamic therapy of tumours 34,35 .BWO has an orthorhombic structure and belongs to the Aurivillius family. It is formed by alternating (Bi 2 O 2 ) n 2n+ and perovskite (WO 4 ) n 2n layers 36 , which are composed of (WO 6 ) octahedral layers and (Bi-O-Bi) layers. Their crystal structure can also be described by alternating [Bi 2 O 2 ] 2+ slabs and [WO 4 ] 2− slabs, with oxygen atoms shared between the slabs to create chemical bonds. An important characteristic of this structure is that local environments of both W and Bi cations are highly distorted 37 . The off-centre octahedral distortions are a general feature of the structural chemistry of d 0 metal cations. Each W cation is coordinated with six O atoms to form [WO 6 ] octahedral clusters that are connected to each other by corner-sharing O atoms. The (Bi 2 O 2 ) 2+ layers are sandwiched between (WO 6 ) octahedral layers. From an electronic point of view, BWO presents hybridized valence bands occupied by the Bi 6 s and O 2p states that shift the absorption band edge towards the visible region, with the concomitant appearance of a narrow absorpt...

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Tailoring the Bactericidal Activity of Ag Nanoparticles/α-Ag₂WO₄Composite Induced by Electron Beam and Femtosecond Laser Irradiation: Integration of Experiment and Computational Modeling

Cited by 36 publications

References 71 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

Ag Nanoparticles/AgX (X=Cl, Br and I) Composites with Enhanced Photocatalytic Activity and Low Toxicological Effects

Femtosecond-laser-irradiation-induced structural organization and crystallinity of Bi2WO6

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Tailoring the Bactericidal Activity of Ag Nanoparticles/α-Ag2WO4Composite Induced by Electron Beam and Femtosecond Laser Irradiation: Integration of Experiment and Computational Modeling

Cited by 36 publications

References 71 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

Ag Nanoparticles/AgX (X=Cl, Br and I) Composites with Enhanced Photocatalytic Activity and Low Toxicological Effects

Femtosecond-laser-irradiation-induced structural organization and crystallinity of Bi2WO6

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Tailoring the Bactericidal Activity of Ag Nanoparticles/α-Ag₂WO₄Composite Induced by Electron Beam and Femtosecond Laser Irradiation: Integration of Experiment and Computational Modeling

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