Ozone-oxygen gas enhanced passivation of pure iron

Nanjo, Hiroshi; Suzuki, Yasunori; Hayasaka, Junko; Hassan, Fathy M.; Venkatachalam, S.; Nishioka, Makihito; Kanakubo, Mitsuhiro; Aida, Tsutomu; Onagawa, Jun

doi:10.1016/j.electacta.2010.03.063

Cited by 6 publications

(3 citation statements)

References 43 publications

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“…Figure b shows the relative areas of PL spectra. The covering of oxygen vacancies was most active in the oxygen atmosphere as the generated ozone not only accelerated the decomposition of the ligand but also covered the NCs with oxygen vacancies . XPS O 1s analysis was performed to check the controllability of the oxygen vacancies in ZnO by UV irradiation (Figure ).…”

Section: Results and Discussionmentioning

confidence: 99%

“…The covering of oxygen vacancies was most active in the oxygen atmosphere as the generated ozone not only accelerated the decomposition of the ligand but also covered the NCs with oxygen vacancies. 26 XPS O 1s analysis was performed to check the controllability of the oxygen vacancies in ZnO by UV irradiation (Figure 6). The oxygen in ZnO was involved in forming various bonds: O−Zn bonds in the ZnO lattice without any oxygen vacancies confirmed at 530.5 eV and 531.8 eV peak originated from oxygen vacancies (O-V o ) in the lattice.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

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ZnO Nanocrystal Thin Films for Quantum-Dot Light-Emitting Devices

Han

Lee

et al. 2020

ACS Appl. Nano Mater.

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Zinc oxide nanocrystals (ZnO NCs) were synthesized via a sol−gel method. After the synthesis, their surface was modified using 2,2,2-trifluoroacetic acid followed by ultraviolet (UV) treatment of the resulting fluorinated ZnO (F-ZnO) NC thin films. The chemical bonding therein and their structural and electrical properties were investigated. Moreover, the oxygen vacancy and electroluminescence properties of the densified ZnO NCs were evaluated. The effects of both UV treatment and fluorination on the morphological and electrical characteristics of the F-ZnO NC thin films were established. Based on the results, the ligand on the NCs was decomposed, and the thin film was densified. The mobility of the UV-treated F-ZnO NC thin film, which is 20.48 cm 2 •V −1 •s −1 , is four orders higher than the pristine ZnO NC thin film. By UV irradiation, the recombination of oxygen vacancies in ZnO was controlled. With the oxygen vacancies decreased, the core electroluminescence of ZnO was enhanced and the band gap of the ZnO NCs was widened from 3.25 to 3.51 eV. Therefore, the core electroluminescence of ZnO was enhanced while the interlayer emission was decreased for quantum-dot lightemitting device applications.

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Section: Results and Discussionmentioning

confidence: 99%

Section: ■ Results and Discussionmentioning

confidence: 99%

ZnO Nanocrystal Thin Films for Quantum-Dot Light-Emitting Devices

Han

Lee

et al. 2020

ACS Appl. Nano Mater.

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“…Once a metal is exposed to the atmospheric environment, an indigenous oxide film will instantaneously form on the metal surface [ 2 ], which makes it impossible to modify the film during its growth. Some methods—such as photon-assisted oxidation [ 5 , 6 ] and ozone treatment [ 7 ]—have been developed for post-processing the native passive films, however, they exhibit limited effects on the corrosion resistance. Low-energy oxygen implantation on the bare metal surface (cleaned by Ar + etching) has recently been reported as a promising method of promoting the growth of metal oxide films [ 8 , 9 ].…”

Section: Introductionmentioning

confidence: 99%

A Super Anticorrosive Ultrathin Film by Restarting the Native Passive Film on 316L Stainless Steel

Ren

Kang

et al. 2023

Nanomaterials

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The corrosion resistance of stainless steel is attributed to the extraordinary protectiveness of the ultrathin native passive film (~3 nanometers) on alloy surface. This protectiveness, independent of alloying, can possibly be further increased by modifying the native film to resist corrosion in harsh conditions. However, the modification based on the film itself is extremely difficult due to its rapid, self-limiting growth. Here we present a strategy by using low-temperature plasma processing so as to follow the growth kinetics of the native film. The native oxide film is restarted and can uniformly grow up to ~15 nanometers in a self-limiting manner. High-resolution TEM found that the film exhibited a well-defined, chemical-ordering layered structure. The following corrosion tests revealed that the anodic current density of the alloy decreased by two orders of magnitude in 0.6 M NaCl solution with a remarkable increase of pitting potential. This enhancement is also observed in Fe-Cr alloys with Cr contents above ~10.5 wt.%. The superior protectiveness of the alloy is thus attributed to the continuous and thickened high-quality ultrathin Cr2O3 layer in the restarted film.

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