Alumina (Al2O3) 1D nanotubular structures were synthesized by chemical vapor deposition (CVD) using aluminum (Al) and Al 2O3 powder sources at a temperature of 1300 °C and a pressure of 100 Pa. At present, no research has been published regarding the synthesis of α-phase Al2O3 nanotubes using only a powder source. In this work, we attempted to grow α-phase Al 2O3 nanotubes without catalysts. As-deposited nanotubular structures had an irregular and ragged surface morphology that was related to the boundary layer thickness. Moreover, complementary nanotubular structures can be obtained via an annealing process. A model to describe the irregular nanotubular structure formation was suggested, and the effect of the boundary layer thickness was demonstrated in our experimental conditions.
Bibliographical noteFunding Information:
This work was supported by the Agency for Defense Development (ADD), Republic of Korea.
All Science Journal Classification (ASJC) codes
- Electronic, Optical and Magnetic Materials
- Ceramics and Composites
- Process Chemistry and Technology
- Surfaces, Coatings and Films
- Materials Chemistry