| About this Abstract |
| Meeting |
MS&T24: Materials Science & Technology
|
| Symposium
|
Grain Boundaries, Interfaces, and Surfaces: Fundamental Structure-Property-Performance Relationships
|
| Presentation Title |
Direct Observation of Anisotropic Growth of Nickel Oxide Nanostructure by the Terrace-Ledge-Kink Mechanism |
| Author(s) |
Boyi Qu, Klaus van Benthem |
| On-Site Speaker (Planned) |
Klaus van Benthem |
| Abstract Scope |
One-directional growth of single crystalline nickel oxide nanostructures from individual Ni nanoparticles was observed during in-situ electron microscopy experiments at high temperature in the presence of water vapor. High-aspect ratio growth from metal feedstock particles was favored on select surfaces with sufficiently high total surface energies. In-situ high resolution transmission electron microscopy was used to directly observe layer-by-layer growth at the buried NiO/Ni interface. Individual layers of NiO were observed to grow by disconnection migration along the oxide/metal interface plane. At interfacial steps oxidation of Ni is governed by oxygen vacancy migration along the interface plane. The junction between the oxide/metal interface and the gas phase serves as nucleation site. The results demonstrate the applicability of the terrace-ledge-kink crystal growth model for reactive crystal growth processes at internal heterophase interfaces. This study was financially supported by the National Science Foundation under award DMR-1836571. |