Abstract
In-situ transmission electron microscopy in combination with a heating stage has been employed to real-time monitor variations of σ-phase MnO2 nanoflowers in terms of their morphology and crystalline structures upon thermal annealing at elevated temperatures up to ̃665 °C. High-temperature annealing drives the diffusion of the small ?-MnO 2 nanocrystallites within short distances less than 15 nm and the fusion of the adjacent σ-MnO2 nanocrystallites, leading to the formation of larger crystalline domains including highly crystalline nanorods. The annealed nanoflowers remain their overall flower-like morphology while they are converted to σ-MnO2. The preferred transformation of the σ-MnO2 to the α-MnO2 can be ascribed to the close lattice spacing of most crystalline lattices between σ-MnO 2 and α-MnO2, that might lead to a possible epitaxial growth of α-MnO2 lattices on the σ-MnO 2 lattices during the thermal annealing process. © Science China Press and Springer-Verlag Berlin Heidelberg 2012.
| Original language | English |
|---|---|
| Pages (from-to) | 2346-2352 |
| Journal | Science China Chemistry |
| Volume | 55 |
| Issue number | 11 |
| DOIs | |
| Publication status | Published - Nov 2012 |
| Externally published | Yes |
Bibliographical note
Publication details (e.g. title, author(s), publication statuses and dates) are captured on an “AS IS” and “AS AVAILABLE” basis at the time of record harvesting from the data source. Suggestions for further amendments or supplementary information can be sent to [email protected].Research Keywords
- α-MnO2
- σ-MnO2 nanoflowers
- In-situ TEM
- Mechanism study
- Thermal annealing