Yang Zhijie, Yang Jianhui, Bergström Johanna, Khazen Khashayar, Pileni Marie-Paule
Université Pierre et Marie Curie, UMR 7070, LM2N, 4 place Jussieu, 75005 Paris, France.
Phys Chem Chem Phys. 2014 Jun 7;16(21):9791-6. doi: 10.1039/c3cp54656j. Epub 2014 Jan 16.
8 nm Co nanoparticles with various crystalline structures called polymorphs were produced using different synthetic procedures, such as using reverse micelles, the thermal decomposition of organometallics approach or the hot injection process. These 8 nm Co nanoparticles differing by their crystalline structures are exposed to oxygen at elevated temperature. The fcc Co polycrystalline nanoparticles produce either Co-CoO yolk-shell or CoO hollow structures whereas amorphous Co nanoparticles produce Co-CoO core-shell nanoparticles. Furthermore, single domains with either hcp or ε crystalline structure behave differently upon oxygen diffusion. Co-CoO nanoparticles were produced from the hcp phase while CoO hollow nanoparticles were the product for ε-phase Co nanocrystals.
使用不同的合成方法制备了具有多种晶体结构（即多晶型物）的8纳米钴纳米颗粒，例如使用反胶束、有机金属热分解法或热注射法。这些晶体结构不同的8纳米钴纳米颗粒在高温下暴露于氧气中。面心立方（fcc）钴多晶纳米颗粒会生成Co-CoO蛋黄壳结构或CoO中空结构，而非晶态钴纳米颗粒则生成Co-CoO核壳纳米颗粒。此外，具有六方密堆积（hcp）或ε晶体结构的单畴在氧扩散时表现不同。由hcp相生成Co-CoO纳米颗粒，而ε相钴纳米晶体的产物是CoO中空纳米颗粒。
