| About this Abstract |
| Meeting |
2022 TMS Annual Meeting & Exhibition
|
| Symposium
|
Functional Nanomaterials: Functional Low-Dimensional (0D, 1D, 2D) Materials 2022
|
| Presentation Title |
Porous Assemblies of 2-D MnO2 Nanosheets and Their Conversion to 1-D Tunnel Structures |
| Author(s) |
Peter Metz, Alec Ladonis, Peng Gao, Madeleine Flint, Scott Misture |
| On-Site Speaker (Planned) |
Scott Misture |
| Abstract Scope |
In the case of exfoliated and re-assembled 2-D oxides, little work has been published concerning the thermal stability and phase transitions that occur upon heating these high surface area solids. The talk will show the high specific capacitance for ion intercalation into porous nanosheet assemblies and how the material responds to thermal annealing. We focus on measuring nucleation and growth of tunnel-structure phase fragments – to capture the mechanisms of structural phase transitions – using primarily in-situ Raman spectroscopy and X-ray total scattering. The result of heating MnO2 nanosheet clusters is to convert those regions of the material with 2 or more re-stacked nanosheets into the 1-D tunnel form of MnO2 at the local scale. In other words, a hierarchically porous solid results where the tunnel pores exist within the porous MnO2 nanosheet assembly. The electrochemical response dramatically changes throughout the conversion, supporting the structural evidence for the nanoscale transition. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Phase Transformations, Nanotechnology, Characterization |