The effect of oxygen partial pressure on physical properties of nano‐crystalline silver oxide thin films deposited by RF magnetron sputtering

Reddy, P. N.; Sreedhar, Adem; Reddy, M. Muralidhar; Uthanna, S.; Pierson, J.F.

doi:10.1002/crat.201100206

Cited by 20 publications

(8 citation statements)

References 31 publications

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“…In RF magnetron sputtering, the physical properties of the deposited thin films critically depend on the sputter parameters such as oxygen partial pressure, substrate temperature, and substrate bias voltage, sputtering pressure and sputter power. The influence of oxygen partial pressure on the structural, electrical, and optical properties of silver oxide films formed by RF magnetron sputtering was earlier reported [28]. In the present investigation, nanocrystalline Ag 2 O films were deposited on glass and silicon substrate by RF magnetron sputtering at different substrate temperatures.…”

Section: Introductionmentioning

confidence: 51%

Characterization of Silver Oxide Films Formed by Reactive RF Sputtering at Different Substrate Temperatures

Reddy

Pierson

et al. 2014

ISRN Optics

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Silver oxide (A 2 O) films were deposited on glass and silicon substrates held at temperatures in the range 303-473 K by reactive RF magnetron sputtering of silver target. The films formed at room temperature were single phase Ag 2 O with polycrystalline in nature, while those deposited at 373 K were improved in the crystallinity. The films deposited at 423 K were mixed phase of Ag 2 O and Ag. Atomic force micrographs of the films formed at room temperature were of spherical shape grains with size of 85 nm, whereas those deposited at 473 K were with enhanced grain size of 215 nm with pyramidal shape. Electrical resistivity of the single phase films formed at room temperature was 5.2 × 10 −3 Ωcm and that of mixed phase was 4.2 × 10 −4 Ωcm. Optical band gap of single phase films increased from 2.05 to 2.13 eV with the increase of substrate temperature from 303 to 373 K, while in mixed phase films it was 1.92 eV.

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Section: Introductionmentioning

confidence: 51%

Characterization of Silver Oxide Films Formed by Reactive RF Sputtering at Different Substrate Temperatures

Reddy

Pierson

et al. 2014

ISRN Optics

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“…On the other hand, Ag 3d peaks and the atomic percentage of Ag (Figure C) revealed that more AgNPs were exposed on Ag@PDA-5 than on Ag@PDA-2.5. The Ag 3d 5/2 and Ag 3d 3/2 peaks of Ag@PDA-2.5 and Ag@PDA-5 were found at 367.5–367.8 eV and 373.5–373.8 eV, respectively, which could be attributed to Ag 2 O. − These results indicate that the AgNPs on Ag@PDA-2.5 and Ag@PDA-5 consist of Ag 2 O. It was interesting that significantly more AgNPs were exposed on Ag@PDA-5 than on Ag@PDA-2.5, while the amount of Ag + released from Ag@PDA-5 and Ag@PDA-2.5 was approximately the same (Figure E).…”

Section: Results and Discussionmentioning

confidence: 80%

A Mussel-Inspired Facile Method to Prepare Multilayer-AgNP-Loaded Contact Lens for Early Treatment of Bacterial and Fungal Keratitis

Liu

Jiang

et al. 2018

ACS Biomater. Sci. Eng.

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The use of contact lenses for the early treatment of bacterial or fungal keratitis has become a new research focus. Two main requirements of the therapeutic contact lenses are antimicrobial ability and visible light transmittance. Silver nanoparticles (AgNPs), as a nonspecific antimicrobial component, have been loaded onto contact lenses for the treatment of bacterial and fungal keratitis. Recently, it was reported that, via a simple immersion method, AgNPs can be synthesized and fixed onto the surface of polydopamine (PDA)-coated materials. However, in this study, we found that the above traditional method has the disadvantages of poor AgNP loading and low visible light transmittance, which could be induced by a limited amount of phenolic hydroxyl groups on and second oxidation of the PDA coating, respectively. To overcome these disadvantages, in this paper, we provided a facile and novel method to robustly bind multilayer-AgNPs on contact lens surfaces by using dopamine as a reducing agent and bioglue. In comparing with the monolayer-AgNP-loaded contact lenses fabricated by the traditional method, the multilayer-AgNP-loaded contact lenses had excellent antimicrobial ability and better visible light transmittance. Moreover, the multilayer-AgNP-loaded contact lens had low cytotoxicity to human corneal epithelial cells and anti-inflammation properties. Furthermore, the shortcoming of decreasing visible light transmittance induced by excess adherence of AgNPs on the multilayer-AgNP-loaded contact lens was alleviated by decreasing the size of AgNPs through altering the concentration of dopamine and AgNO3. Contact lenses loaded with small AgNPs (Ag@PDA-2.5, diameter ≈ 25–50 nm) had approximately the same Ag+ release and antimicrobial abilities, but significantly better visible light transmittance and anti-inflammatory properties than the contact lenses loaded with large AgNPs (Ag@PDA-5, diameter ≈ 50–75 nm). After that, in vivo testing indicated the promising therapeutic strategy of multilayer-AgNP-loaded contact lenses (Ag@PDA-2.5) for early bacterial keratitis and fungal keratitis. In addition, PDA coating could provide reactive sites to immobilize other biomolecules or drugs on this multilayer-AgNP-loaded contact lens for further combination therapies in treating bacterial or fungal keratitis. Finally, the stability of the visible light transmittance of the multilayer-AgNP-loaded contact lens was detected. The visible light transmittance of Ag@PDA-2.5 was weakened after being cultured with an extremely high concentration of bacteria, while it was stable in the moderate work environment. Though PDA coating had been wildly used to modify implantation devices, however, few studies about PDA coating modified contact lenses have been reported so far. Therefore, this research also provides an important basis for using PDA coating to modify a therapeutic contact lens.

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“…HR-XPS spectra of (a) Nb 3d of Nb 2 O 5 /Cu, (b) O 1s of Nb 2 O 5 /Cu; Nb and O spectra for Nb 2 O 5 /Ag and Nb 2 O 5 /Ca are shown in Figures S14 and S15, (c) Nb 3p/Ag 3d of Nb 2 O 5 /Ag, (d) Cu 2p of Nb 2 O 5 /Cu, and (e) Ca 2p of Nb 2 O 5 /Ca …”

Section: Resultsmentioning

confidence: 99%

Nb₂O₅, LiNbO₃, and (Na, K)NbO₃ Thin Films from High-Concentration Aqueous Nb-Polyoxometalates

et al. 2022

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Synthesizing functional materials from water contributes to a sustainable energy future. On the atomic level, water drives complex metal hydrolysis/condensation/speciation, acid–base, ion pairing, and solvation reactions that ultimately direct material assembly pathways. Here, we demonstrate the importance of Nb-polyoxometalate (Nb-POM) speciation in enabling deposition of Nb2O5, LiNbO3, and (Na, K)NbO3 (KNN) from high-concentration solutions, up to 2.5 M Nb for Nb2O5 and ∼1 M Nb for LiNbO3 and KNN. Deposition of KNN from 1 M Nb concentration represents a potentially important advancment in lead-free piezoelectrics, an application that requires thick films. Solution characterization via small-angle X-ray scattering and Raman spectroscopy described the speciation for all precursor solutions as the [H x Nb24O72](x−24) POM, as did total pair distribution function analyses of X-ray scattering of amorphous gels prior to conversion to oxides. The tendency of the Nb24-POM to form extended networks without crystallization leads to conformal and well-adhered films. The films were characterized by X-ray diffraction, atomic force microscopy, scanning electron microscopy, ellipsometry, and X-ray photoelectron spectroscopy. As a strategy to convert aqueous deposition solutions from {Nb10}-POMs to {Nb24}-POMs, we devised a general procedure to produce doped Nb2O5 thin films including Ca, Ag, and Cu doping.

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The effect of oxygen partial pressure on physical properties of nano‐crystalline silver oxide thin films deposited by RF magnetron sputtering

Cited by 20 publications

References 31 publications

Characterization of Silver Oxide Films Formed by Reactive RF Sputtering at Different Substrate Temperatures

Characterization of Silver Oxide Films Formed by Reactive RF Sputtering at Different Substrate Temperatures

A Mussel-Inspired Facile Method to Prepare Multilayer-AgNP-Loaded Contact Lens for Early Treatment of Bacterial and Fungal Keratitis

Nb₂O₅, LiNbO₃, and (Na, K)NbO₃ Thin Films from High-Concentration Aqueous Nb-Polyoxometalates

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The effect of oxygen partial pressure on physical properties of nano‐crystalline silver oxide thin films deposited by RF magnetron sputtering

Cited by 20 publications

References 31 publications

Characterization of Silver Oxide Films Formed by Reactive RF Sputtering at Different Substrate Temperatures

Characterization of Silver Oxide Films Formed by Reactive RF Sputtering at Different Substrate Temperatures

A Mussel-Inspired Facile Method to Prepare Multilayer-AgNP-Loaded Contact Lens for Early Treatment of Bacterial and Fungal Keratitis

Nb2O5, LiNbO3, and (Na, K)NbO3 Thin Films from High-Concentration Aqueous Nb-Polyoxometalates

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Product

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Nb₂O₅, LiNbO₃, and (Na, K)NbO₃ Thin Films from High-Concentration Aqueous Nb-Polyoxometalates