| About this Abstract |
| Meeting |
MS&T21: Materials Science & Technology
|
| Symposium
|
Controlled Synthesis, Processing, and Applications of Structural and Functional Nanomaterials
|
| Presentation Title |
NiO Nanostructure Growth at High Temperature in Water Vapor via In-situ ESEM |
| Author(s) |
Boyi Qu, Klaus van Benthem |
| On-Site Speaker (Planned) |
Boyi Qu |
| Abstract Scope |
This study reports on the in-situ growth of NiO nanostructures from nickel nanoparticles at 800 °C under water vapor atmosphere observed by environmental scanning electron microscopy (ESEM). Both high aspect ratio nanorod morphology and particle elongation were observed, with growth rates typically below 1.8 nm/s. Selected area electron diffraction and energy dispersive x-ray spectroscopy has confirmed the nanostructure to be NiO. The growth of nanostructure is enabled by the outward diffusion of nickel and the adsorption of oxidant molecules to the native oxide layer on particle surface. High aspect ratio nanorod forms at grain boundaries of the polycrystalline native oxide layer on particle surface, which serves as fast diffusion paths. Annealing of particles under different oxygen partial pressures before ESEM shows that growth only takes place when particle surface energy is high enough so that the growth can further decrease total surface energies. |