|About this Abstract
||MS&T23: Materials Science & Technology
||Grain Boundaries, Interfaces, and Surfaces: Fundamental Structure-Property-Performance Relationships
||Direct Observation of Anisotropic Growth of Nickel Oxide Nanostructure by the Terrace-ledge-kink Mechanism
||Boyi Qu, Klaus van Benthem
|On-Site Speaker (Planned)
||Klaus van Benthem
One-directional growth of single crystalline nickel oxide nanostructures from individual Ni nanoparticles was observed during in-situ electron microscopy experiments at high temperature and 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.