XPS and some surface characterizations of electrodeposited MgO nanostructure

Taleatu, Bidini A.; Omotoso, Ezekiel; Lal, Chhagan; Makinde, W. O.; Ogundele, K. T.; Ajenifuja, Emmanuel; Lasisi, A. R.; Eleruja, Marcus Adebola; Mola, Genene Tessema

doi:10.1002/sia.5425

Cited by 44 publications

(26 citation statements)

References 33 publications

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“…There is no other visible contribution of metallic magnesium related to the main Mg KLL emission peaks. These spectra that were found in the range 304.4-308.8 eV are attributed to the oxidation of polycrystalline Mg [56]. FE-SEM images in Figure 4 show the surface morphologies of the bare sample and the coatings that were assembled by the PM technique.…”

Section: Microstructure Chemical Composition and Phase Analysismentioning

confidence: 99%

Biodegradable Mg/HA/TiO2 Nanocomposites Coated with MgO and Si/MgO for Orthopedic Applications: A Study on the Corrosion, Surface Characterization, and Biocompatability

et al. 2017

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Abstract:In the field of orthopedics, magnesium (Mg) and magnesium-based composites as biodegradable materials have attracted fundamental research. However, the medical applications of magnesium implants have been restricted owing to their poor corrosion resistance, especially in the physiological environment. To improve the corrosion resistance of Mg/HA/TiO 2 nanocomposites, monolayer MgO and double-layer Si/MgO coatings were fabricated layer-by-layer on the surface of a nanocomposite using a powder metallurgy route. Then, coating thickness, surface morphology, and chemical composition were determined, and the corrosion behavior of the uncoated and coated samples was evaluated. Field-emission scanning electron microscopy (FE-SEM) micrographs show that an inner MgO layer with a porous microstructure and thickness of around 34 µm is generated on the Mg/HA/TiO 2 nanocomposite substrate, and that the outer Si layer thickness is obtained at around 23 µm for the double-layered coated sample. Electrochemical corrosion tests and immersion corrosion tests were carried out on the uncoated and coated samples and the Si/MgO-coated nanocomposite showed significantly improved corrosion resistance compared with uncoated Mg/HA/TiO 2 in simulated body fluid (SBF). Corrosion products comprising Mg(OH) 2 , HA, Ca 3 (PO 4 ) 2 , and amorphous CaP components were precipitated on the immersed samples. Improved cytocompatibility was observed with coating as the cell viability ranged from 73% in uncoated to 88% for Si/MgO-coated Mg/HA/TiO 2 nanocomposite after nine days of incubation.

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Section: Microstructure Chemical Composition and Phase Analysismentioning

confidence: 99%

Biodegradable Mg/HA/TiO2 Nanocomposites Coated with MgO and Si/MgO for Orthopedic Applications: A Study on the Corrosion, Surface Characterization, and Biocompatability

et al. 2017

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“…1b(ii)]. This can be attributed to the fact that (i) annealing can give film's particles adequate energy to orient in proper equilibrium site and (ii) crystallographic texture of thin film can be improved by thermal treatment [7]. Cross-sectional SEM studies gave the film's thickness as *20.16 lm.…”

Section: Film Surface Structurementioning

confidence: 96%

“…For semiconducting materials, optical band gap can be expressed by tauc model and parabolic band [2,7]. …”

Section: Energy Band Gapmentioning

confidence: 99%

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Stable α-MnS thin film deposited by two-electrode cell: synthesis, structural characterization and photoemission spectroscopic studies

2015

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Stable MnS thin film was deposited from catalyst-free inorganic solution by electrochemical cell. The film was characterized by some surface profiling techniques. Morphology revealed that film's particles were fairly distributed across substrate's surface. Crystallinity and surface growth height/roughness were observed before and after post-deposition annealing. Optical studies further showed that annealing has improved film transmittance across visible wavelength region. Reflections from planes associated with only rock salt structure of MnS were prominently identified by diffraction studies. An estimated average crystal size of 17.40 nm suggested that the deposited film is mainly composed of nanocrystalline particles. Film durability was appraised by core-level profiling of Mn and S binding energy (BE) positions during X-ray photoemission spectroscopy (XPS). The results indicated that before and after vacuum annealing, chemical states of Mn and S remained the same suggesting that the film did not undergo any form of transformation after long exposure to ambient environment. This study demonstrated sustainability of MnS electrode in extreme environmental condition.

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“…The core-level Mg 2p spectrum for all AMlite surfaces could be resolved into two spectra having binding energy peaks at 49.8-50.1 and 50.8-51.1 eV, which are attributed to metallic Mg and Mg(OH) 2 , respectively. 38 Oxygen (O) existed in the form of OH in the surface film, as indicated by the characteristic peak value at 531.8 -531.9.…”

Section: Xps and Xrd Analysis Of Following Exposure To Nacl Solution-mentioning

confidence: 99%

The Unexpected Role of Benzotriazole in Mitigating Magnesium Alloy Corrosion: A Nucleating Agent for Crystalline Nanostructured Magnesium Hydroxide Film

Wang

Pohl

et al. 2015

J. Electrochem. Soc.

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Benzotriazole (BTA), an effective corrosion inhibitor for Cu or Cu-containing Al alloys, was added to 0.1 M NaCl to study its potential role in suppressing corrosion of the commercial Mg alloy, AMlite. In particular, the impact of pH and BTA concentration was investigated, indicating that BTA was effective at restricting corrosion of AMlite in weakly alkaline NaCl solution, i.e. pH 10.0. The degree of the protection afforded was a function of BTA concentration. The best corrosion inhibition was found in the NaCl containing 15 g/L BTA, however, the mechanism of inhibition was not a classical function, nor related to the inhibition mechanism of BTA for Cu-bearing alloys. Instead it is posited that BTA − anions act as a nucleating agent to stimulate the formation of a dense and highly crystalline Mg(OH) 2 surface film with a uniform nano-structure capable of passivating the Mg-alloy, in contrast to say, the insoluble Cu-BTA complex via Cu-N coordination bonds for Cu-alloys. The magnitude of this effect of BTA on Mg corrosion was not anticipated, but effective, with beneficial implications to utilization of Mg alloys as anode materials, where in such cases, when dissolution occurs, the anode can passivate with little change in its potential.

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XPS and some surface characterizations of electrodeposited MgO nanostructure

Cited by 44 publications

References 33 publications

Biodegradable Mg/HA/TiO2 Nanocomposites Coated with MgO and Si/MgO for Orthopedic Applications: A Study on the Corrosion, Surface Characterization, and Biocompatability

Biodegradable Mg/HA/TiO2 Nanocomposites Coated with MgO and Si/MgO for Orthopedic Applications: A Study on the Corrosion, Surface Characterization, and Biocompatability

Stable α-MnS thin film deposited by two-electrode cell: synthesis, structural characterization and photoemission spectroscopic studies

The Unexpected Role of Benzotriazole in Mitigating Magnesium Alloy Corrosion: A Nucleating Agent for Crystalline Nanostructured Magnesium Hydroxide Film

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