Silver Tungstate Nanoparticles for the Detection of Ethanol, Ammonia and Acetone Gases

Adikay, Sreedevi; Priyanka, K. P.; Vattappalam, Sunil C.; Varghese, Thomas

doi:10.1007/s11664-018-6551-8

Cited by 16 publications

(5 citation statements)

References 21 publications

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“…α-Ag 2 WO 4 is a semiconductor material that presents interesting and promising properties, such as photoluminescence, , photocatalysis, − gas sensing, − antimicrobial, and antifungal activities. − Our research group, by means of a combination of experimental and theoretical work, has conducted studies concerned with the growth of Ag NPs on several Ag constituent materials under exposure to electron beams using electronic microscopy, such as α-Ag 2 WO 4 , ,− β-Ag 2 WO 4, , β-Ag 2 MoO 4 , , Ag 2 CrO 4 , AgVO 3 , and Ag 3 PO 4 crystals, in which the nucleation of Ag NPs on the surfaces of these materials take place. − These Ag/semiconductor composites present a Schottky barrier that is generated at the interface of the Ag NPs and the semiconductor, which can effectively improve the separation efficiency of photoinduced electron–hole pairs. At the same time, Ag absorption at the surface of the semiconductor produces the SPR effect, which can significantly enhance the absorption of visible light and improve the excitation of active charge carriers for a semiconductor photocatalyst. , …”

Section: Introductionmentioning

confidence: 99%

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

Macedo

Machado

Roca

et al. 2019

ACS Appl. Bio Mater.

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In nanotechnology research, significant effort is devoted to fabricating patterns of metallic nanoparticles on the surfaces of different semiconductors to find innovative materials with favorable characteristics, such as antimicrobial and photocatalytic properties, for novel applications. We present experimental and computational progress, involving a combined approach, on the antimicrobial activity against methicillin-resistant Staphylococcus aureus (MRSA) of as-synthesized α-Ag2WO4 samples and Ag nanoparticle composites (Ag NPs)/α-Ag2WO4. The former included two morphologies: hexagonal rod-like (α-Ag2WO4-R) and cuboid-like (α-Ag2WO4-C), and the latter included composites formed under electron beam, Ag NPs/α-Ag2WO4-RE and Ag NPs/α-Ag2WO4-CE, and femtosecond (fs) laser irradiation, Ag NPs/α-Ag2WO4-RL and Ag NPs/α-Ag2WO4-CL. Direct observations of the arrangement of Ag NPs on the Ag NPs/α-Ag2WO4 composites irradiated with an electron beam and laser, through transmission electron microscopy (TEM), high-resolution TEM, energy-dispersive X-ray spectroscopy, and field-emission scanning electron microscopy, allow us to investigate the surface morphology, chemical composition, homogeneity, and crystallinity. Therefore, these experimental factors, and in particular, the facet-dependent response of Ag NPs/α-Ag2WO4 composites were discussed and analyzed from the perspective provided by the results obtained by first-principles calculations. On this basis, α-Ag2WO4-R material proved to be a better bactericidal agent than α-Ag2WO4-C with minimum bactericidal concentration (MBC) values of 128 and 256 μg/mL, respectively. However, the Ag NPs/α-Ag2WO4-CL composite is the most efficient bactericidal agent of all tested samples (MBC = 4 μg/mL). This superior performance can be attributed to the cooperative effects of crystal facets and defect engineering. These results on the synthesis and stability of the Ag NPs/α-Ag2WO4 composites can be used for the development of highly efficient bactericidal agents for use in environmental remediation and the potential extension of methods to produce materials with catalytic applications.

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Section: Introductionmentioning

confidence: 99%

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

Macedo

Machado

Roca

et al. 2019

ACS Appl. Bio Mater.

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“…Metal oxides, including tungsten oxide and metal tungstates, show several advantages over other materials, such as low toxicity, low synthetic cost, high resistance against photocorrosion, and compatibility with up‐scale. Normally, metal tungstate materials were tested for SC applications, [ 15 ] Li‐ion battery, [ 16 ] electrocatalysis, [ 17 ] gas sensors, [ 18 ] and photocatalyst. [ 19 ] These types of structures may provide facile access of interior sites to the electrolyte ions.…”

Section: Introductionmentioning

confidence: 99%

“…sensors, [18] and photocatalyst. [19] These types of structures may provide facile access of interior sites to the electrolyte ions.…”

Section: Introductionmentioning

confidence: 99%

Binder‐Free Synthesis of Mesoporous Nickel Tungstate for Aqueous Asymmetric Supercapacitor Applications: Effect of Film Thickness

et al. 2022

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However, the cost and the energy stored by these devices vary with the design, chemistry, and materials used to fabricate. The specific energy for batteries is comparatively more than the SCs and capacitors. [1,2] Due to outstanding cycle stability, greater power density, and rapid charge-discharge rate, SCs are some of the better optimistic contenders. [3,4] A significant drawback of SCs is that they are deficient in specific energy to fulfill the growing energy requirements for new-age energy storage equipment. [5,6] Nowadays, more research activities have been concentrated to enhance the specific energy of SCs without losing their specific power and cyclability. [7,8] The specific energy (E ¼ 0.5CV 2 ) can be raised by improving capacitance (C) and operating potential window (V ). Different electroactive materials with rages of capacitance values have been used to fabricate SCs. [9][10][11] Hence, the preparation of novel electrode materials possessing high specific capacitance and fabrication of asymmetric supercapacitors (ASCs) to overcome the issue of low cell potential can result in enhanced specific energy. [12,13] Metal tungstates have the general formula AWO 4 , where A is a divalent cation (A 2þ ¼ Ni, Fe, Mn, Cu, Co) that acts as a network modifier. The monoclinic crystal structure of metal tungstates (shown in Figure 1a,b) resembles with the crystal structure of metal sulfates. [14] Crystal structure formed by tungstate ion with bivalent metal ion forms tetrahedral coordination. However, due to the smaller radius of bivalent cations like nickel having ionic radius of less than 0.77 Å will perform well for the supercapacitors. In addition to this, the bimetallic nature of the metal tungstates helps to improve the energy storage capacity of materials compared to a single metal compound like NiO and WO 3 . Compared to nickel oxide and hydroxide, NiWO 4 have higher molecular mass, leading to lower theoretical capacitance. Higher cost of preparation due to addition of W in synthesis process can be considered a disadvantage. Metal oxides, including tungsten oxide and metal tungstates, show several advantages over other materials, such as low toxicity, low synthetic cost, high resistance against photocorrosion, and compatibility with up-scale. Normally, metal tungstate materials were tested for SC applications, [15] Li-ion battery, [16] electrocatalysis, [17] gas

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“…Among them, alpha silver tungstate (α-Ag 2 WO 4 ) has received special attention from the scientific community because of its interesting properties, including photoluminescence emission [5][6][7][8][9][10], antimicrobial activity [11][12][13][14][15][16][17][18], and photocatalytic properties [11,13,[19][20][21][22][23][24][25]. As a result, α-Ag 2 WO 4 has found exciting applications in cationic dye removal [16], catalytic systems for the oxidation of cyclohexene to adipic acid [22], electrocatalysis [26][27][28][29], the chemical fixation of CO 2 gas [30], and as a lubricant [31] and gas sensor [32,33].…”

Section: Introductionmentioning

confidence: 99%

Disclosing the Biocide Activity of α-Ag2−2xCuxWO4 (0 ≤ x ≤ 0.16) Solid Solutions

Foggi

Gouveia

Pinatti

et al. 2022

IJMS

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In this work, α-Ag2−2xCuxWO4 (0 ≤ x ≤ 0.16) solid solutions with enhanced antibacterial (against methicillin-resistant Staphylococcus aureus) and antifungal (against Candida albicans) activities are reported. A plethora of techniques (X-ray diffraction with Rietveld refinements, inductively coupled plasma atomic emission spectrometry, micro-Raman spectroscopy, attenuated total reflectance–Fourier transform infrared spectroscopy, field emission scanning electron microscopy, ultraviolet–visible spectroscopy, photoluminescence emissions, and X-ray photoelectron spectroscopy) were employed to characterize the as-synthetized samples and determine the local coordination geometry of Cu2+ cations at the orthorhombic lattice. To find a correlation between morphology and biocide activity, the experimental results were sustained by first-principles calculations at the density functional theory level to decipher the cluster coordinations and electronic properties of the exposed surfaces. Based on the analysis of the under-coordinated Ag and Cu clusters at the (010) and (101) exposed surfaces, we propose a mechanism to explain the biocide activity of these solid solutions.

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Silver Tungstate Nanoparticles for the Detection of Ethanol, Ammonia and Acetone Gases

Cited by 16 publications

References 21 publications

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

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

Binder‐Free Synthesis of Mesoporous Nickel Tungstate for Aqueous Asymmetric Supercapacitor Applications: Effect of Film Thickness

Disclosing the Biocide Activity of α-Ag2−2xCuxWO4 (0 ≤ x ≤ 0.16) Solid Solutions

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Silver Tungstate Nanoparticles for the Detection of Ethanol, Ammonia and Acetone Gases

Cited by 16 publications

References 21 publications

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

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

Binder‐Free Synthesis of Mesoporous Nickel Tungstate for Aqueous Asymmetric Supercapacitor Applications: Effect of Film Thickness

Disclosing the Biocide Activity of α-Ag2−2xCuxWO4 (0 ≤ x ≤ 0.16) Solid Solutions

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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

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