Syntheses and Characterization of Wurtzite CoO, Rocksalt CoO, and Spinel Co3O4 Nanocrystals: Their Interconversion and Tuning of Phase and Morphology
| Autor: | Jae Ha Shim, Won Seok Seo, Joon T. Park, Yan Li, Yong-Mook Kang, Dongwook Han, Hyunjoon Song, Hyuk-Sang Kwon, Ki Min Nam |
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| Rok vydání: | 2010 |
| Předmět: |
Materials science
General Chemical Engineering Thermal decomposition Inorganic chemistry Spinel Oxide Hexagonal pyramid General Chemistry engineering.material Crystallography chemistry.chemical_compound Nanocrystal chemistry Phase (matter) Materials Chemistry engineering Nanorod Wurtzite crystal structure |
| Zdroj: | Chemistry of Materials. 22:4446-4454 |
| ISSN: | 1520-5002 0897-4756 |
| DOI: | 10.1021/cm101138h |
| Popis: | Pure rocksalt (c-CoO) and wurtzite (h-CoO) phases of cobaltous oxide (CoO) have been selectively prepared through thermodynamically and kinetically controlled reactions of a single molecular precursor Co(acac)3 (acac: acetylacetonate), respectively. Changing thermal decomposition conditions of the precursor produces different phases and distinct morphologies of the cobaltous oxides. Hexagonal pyramidal shaped h-CoO nanocrystals have been formed by a flash heating of the reaction mixture (185 °C for 2 h, kinetic control condition), whereas cube shaped c-CoO nanocrystals have been produced by a prolonged heating at a relatively low temperature (130 °C for 12 h, thermodynamic control condition). Addition of o-Dichlorobenzene (o-DCB) to the reaction mixture alters the reaction condition to the thermodynamic control regime by slowing down the decomposition rate of the precursor. Further increase of the concentration of o-DCB in the reaction mixture changes the morphology of product from h-CoO hexagonal pyramid... |
| Databáze: | OpenAIRE |
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