Facile conversion of bulk metal surface to metal oxide single-crystalline nanostructures by microwave irradiation: Formation of pure or Cr-doped hematite nanostructure arrays
SCIE
SCOPUS
- Title
- Facile conversion of bulk metal surface to metal oxide single-crystalline nanostructures by microwave irradiation: Formation of pure or Cr-doped hematite nanostructure arrays
- Authors
- Cho, S; Jeong, H; Lee, KH
- Date Issued
- 2010-07-01
- Publisher
- ELSEVIER SCIENCE SA
- Abstract
- We report a method for converting the surfaces of bulk metal substrates (pure iron or stainless steel) to metal oxide (hematite or Cr-doped hematite) nanostructures using microwave irradiation. When microwave radiation (2.45 GHz, single-mode) was applied to a metal substrate under the flow of a gas mixture containing O-2 and Ar, metal oxide nanostructures formed and entirely covered the substrate. The nanostructures were single crystalline, and the atomic ratios of the substrate metals were preserved in the nanostructures. When a pure iron sheet was used as a substrate, hematite nanowires (1000W microwave radiation) or nanosheets (1800W microwave radiation) formed on the surface of the substrate. When a SUS410 sheet was used as a substrate, slightly curved rod-like nanostructures were synthesized. The oxidation states of Fe and Cr in these nanorods were Fe3+ and Cr3+. Quantitative analyses revealed an average Fe/Cr atomic ratio of 9.2, nearly identical to the ratio of the metals in the SUS410 substrate. (c) 2010 Elsevier B.V. All rights reserved.
- Keywords
- Bulk metal; Metal oxide; Microwave irradiation; Nanostructures; Scanning transmission electron microscopy; X-ray photoelectron spectroscopy; CORE/SHELL METAL/CARBON NANOPARTICLES; ARCING-INDUCED FORMATION; THIN-FILMS; ALPHA-FE2O3 FILMS; SEMICONDUCTOR NANOCRYSTALS; WATER; OXIDATION; IRON; ELECTRODES; GROWTH
- URI
- https://oasis.postech.ac.kr/handle/2014.oak/25723
- DOI
- 10.1016/J.TSF.2010.03.004
- ISSN
- 0040-6090
- Article Type
- Article
- Citation
- THIN SOLID FILMS, vol. 518, no. 18, page. 5110 - 5114, 2010-07-01
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