Atomic force microscopy identification of Al-sites on ultrathin aluminum oxide film on NiAl(110)

Li, Yan Jun; Brndiar, Ján; Naitoh, Yoshitaka; Sugawara, Yasuhiro; Štich, Ivan

doi:10.1088/0957-4484/26/50/505704

Cited by 9 publications

(10 citation statements)

References 35 publications

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“…S1, supplemental material 45 ). This structure without bulk counterpart matches perfectly diffraction 18 , near-field microscopy 31,[46][47][48][49] and spectroscopic data 25,31,33 .…”

Section: Introductionsupporting

confidence: 82%

Oxide at the Al-rich Fe0.85Al0.15(110) surface

Dai

Alyabyeva

Bossche

et al. 2020

Phys. Rev. Materials

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The formation of an ultra-thin aluminum oxide film at Fe0.85Al0.15(110) surface (A2 random alloy) has been studied by a variety of surface sensitive techniques (X-ray photoemission, low-energy electron diffraction, surface X-ray diffraction and scanning tunneling microscopy) supplemented by ab initio atomistic simulations. Since iron is not oxidized in the used conditions, the study focused on the coupling between aluminum oxidation and segregation processes. Compared to the bare surface, whose average composition (Fe0.6Al0.4) is closer to the B2-CsCl structure over a ∼ 3 nm depth, the oxidation hardly affects the subsurface segregation of aluminum. All the structural and chemical fingerprints point to an oxide film similar to that found on NiAl(110). It is a bilayer (∼ 7.5Å thick) with a composition close to Al10O13 and a large (18.8 × 10.7)Å 2 nearly rectangular unit cell; an almost perfect match between substrate periodicity and the (1 × 2) oxide supercell is found. Nevertheless, microscopy reveals the presence of anti-phase domain boundaries. Measured Al 2p and O 1s core level shifts match calculated ones; their origin and the relative contributions of initial/final state effects are discussed. The ubiquity of the present oxide on different supports asks for the origin of its stability.

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“…S1, supplemental material 45 ). This structure without bulk counterpart matches perfectly diffraction 18 , near-field microscopy 31,[46][47][48][49] and spectroscopic data 25,31,33 .…”

Section: Introductionsupporting

confidence: 82%

Oxide at the Al-rich Fe0.85Al0.15(110) surface

Dai

Alyabyeva

Bossche

et al. 2020

Phys. Rev. Materials

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“…AFM is a well-established method for characterizing topography of surfaces; however, it is recommended in previous studies as a combined approach with SEM, to ascertain the quality of homogeneity of the samples on a large scale. Moreover, the uneven distribution of peaks and valleys on the chitosan coating, significantly affected the Ra and Rq values of a film surface [38][39][40]. The Ra and Rq values of composite coatings may also be affected by the addition and interaction of NPs.…”

Section: Afm Analysismentioning

confidence: 99%

Effects of Different TiO2 Nanoparticles Concentrations on the Physical and Antibacterial Activities of Chitosan-Based Coating Film

Xing

Guo

et al. 2020

Nanomaterials

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In this investigation, the effect of different concentrations of titanium dioxide (TiO2) nanoparticles (NPs) on the structure and antimicrobial activity of chitosan-based coating films was examined. Analysis using scanning electron microscopy (SEM) and atomic force microscopy (AFM) revealed that the modified TiO2 NPs were successfully dispersed into the chitosan matrix, and that the roughness of the chitosan-TiO2 nanocomposites were significantly reduced. Moreover, X-ray diffraction (XRD) and Fourier transform infrared spectroscopy (FTIR) analyses indicated that the chitosan interacted with TiO2 NPs and possessed good compatibility, while a thermogravimetric analysis (TGA) of the thermal properties showed that the chitosan-TiO2 nanocomposites with 0.05% TiO2 NPs concentration had the best thermal stability. The chitosan-TiO2 nanocomposite exhibited an inhibitory effect on the growth of Escherichia coli and Staphylococcus aureus. This antimicrobial activity of the chitosan-TiO2 nanocomposites had an inhibition zone ranging from 9.86 ± 0.90 to 13.55 ± 0.35 (mm). These results, therefore, indicate that chitosan-based coating films incorporated with TiO2 NPs might become a potential packaging system for prolonging the shelf-life of fruits and vegetables.

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“…This might be due the interaction among the water, emulsifier, acetic acid, glycol and the increased chitosan in the system. Moreover, the inhomogeneous distribution of micropores, meaning the uneven distribution of the peaks and valleys in the chitosan coating, could significantly affect the Ra and Rq values of film surface [ 48 , 49 , 50 , 51 , 52 , 53 , 54 ]. The surfaces with fewer micropores could become less sharp and show a smoother appearance, which might also be influenced by the added concentration of chitosan.…”

Section: Resultsmentioning

confidence: 99%

“…The good uniform microstructure of chitosan coating films are observed from SEM images, which indicates that the mixtures of chitosan, acetic acid and glycerol are homogenous in the coating film. These results could be explained by the interaction of the higher amount chitosan with other components in the prepared system, the adsorbed action of surface tension for coating liquid and the different number of micropores formed on the film surface [ 49 , 50 , 51 , 52 ]. Xing et al (2011b) also reported that the roughness value of control group was higher than the chitosan–oil coated group fruits [ 9 ].…”

Section: Resultsmentioning

confidence: 99%

Preservation Mechanism of Chitosan-Based Coating with Cinnamon Oil for Fruits Storage Based on Sensor Data

Xing

Yang

et al. 2016

Sensors

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The chitosan-based coating with antimicrobial agent has been developed recently to control the decay of fruits. However, its fresh keeping and antimicrobial mechanism is still not very clear. The preservation mechanism of chitosan coating with cinnamon oil for fruits storage is investigated in this paper. Results in the atomic force microscopy sensor images show that many micropores exist in the chitosan coating film. The roughness of coating film is affected by the concentration of chitosan. The antifungal activity of cinnamon oil should be mainly due to its main consistent trans-cinnamaldehyde, which is proportional to the trans-cinnamaldehyde concentration and improves with increasing the attachment time of oil. The exosmosis ratios of Penicillium citrinum and Aspergillus flavus could be enhanced by increasing the concentration of cinnamon oil. Morphological observation indicates that, compared to the normal cell, the wizened mycelium of A. flavus is observed around the inhibition zone, and the growth of spores is also inhibited. Moreover, the analysis of gas sensors indicate that the chitosan-oil coating could decrease the level of O2 and increase the level of CO2 in the package of cherry fruits, which also control the fruit decay. These results indicate that its preservation mechanism might be partly due to the micropores structure of coating film as a barrier for gas and a carrier for oil, and partly due to the activity of cinnamon oil on the cell disruption.

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Atomic force microscopy identification of Al-sites on ultrathin aluminum oxide film on NiAl(110)

Cited by 9 publications

References 35 publications

Oxide at the Al-rich Fe0.85Al0.15(110) surface

Oxide at the Al-rich Fe0.85Al0.15(110) surface

Effects of Different TiO2 Nanoparticles Concentrations on the Physical and Antibacterial Activities of Chitosan-Based Coating Film

Preservation Mechanism of Chitosan-Based Coating with Cinnamon Oil for Fruits Storage Based on Sensor Data

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